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Showing 1 - 200 of 2352 Journals sorted alphabetically
3D Research     Hybrid Journal   (Followers: 17, SJR: 0.214, h-index: 10)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 1.073, h-index: 25)
AAPS J.     Hybrid Journal   (Followers: 20, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 6, SJR: 0.718, h-index: 54)
Abdominal Imaging     Hybrid Journal   (Followers: 14, SJR: 0.723, h-index: 60)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3, SJR: 0.447, h-index: 12)
Academic Psychiatry     Full-text available via subscription   (Followers: 23, SJR: 0.492, h-index: 32)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.135, h-index: 6)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.378, h-index: 30)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.355, h-index: 20)
Acoustics Australia     Hybrid Journal  
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.387, h-index: 6)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.624, h-index: 34)
Acta Biotheoretica     Hybrid Journal   (Followers: 5, SJR: 0.419, h-index: 25)
Acta Diabetologica     Hybrid Journal   (Followers: 14, SJR: 1.318, h-index: 46)
Acta Endoscopica     Hybrid Journal   (Followers: 1, SJR: 0.113, h-index: 8)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.465, h-index: 23)
Acta Geochimica     Hybrid Journal   (Followers: 5)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 1, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 11, SJR: 8.021, h-index: 47)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.53, h-index: 29)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.406, h-index: 30)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.451, h-index: 5)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.22, h-index: 20)
Acta Mechanica     Hybrid Journal   (Followers: 20, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.426, h-index: 29)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5, SJR: 0.525, h-index: 18)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.524, h-index: 14)
Acta Neurochirurgica     Hybrid Journal   (Followers: 7, SJR: 0.833, h-index: 73)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 1, SJR: 0.348, h-index: 27)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 6.61, h-index: 117)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 17)
Acta Parasitologica     Hybrid Journal   (Followers: 9, SJR: 0.581, h-index: 28)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.551, h-index: 39)
Acta Politica     Hybrid Journal   (Followers: 13, SJR: 0.658, h-index: 20)
Activitas Nervosa Superior     Hybrid Journal  
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5, SJR: 0.103, h-index: 4)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 22, SJR: 0.871, h-index: 15)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 15, SJR: 0.795, h-index: 40)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.774, h-index: 52)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3, SJR: 0.319, h-index: 15)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 34, SJR: 0.959, h-index: 44)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15, SJR: 1.255, h-index: 44)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 51, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 22, SJR: 1.397, h-index: 42)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.2, h-index: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 41, SJR: 0.637, h-index: 89)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 0.79, h-index: 44)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.882, h-index: 23)
Aerobiologia     Hybrid Journal   (Followers: 1, SJR: 0.511, h-index: 36)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 9, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 15, SJR: 0.612, h-index: 24)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.248, h-index: 6)
AGE     Hybrid Journal   (Followers: 7, SJR: 1.358, h-index: 33)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.337, h-index: 10)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.529, h-index: 55)
Agricultural Research     Hybrid Journal   (Followers: 3)
Agriculture and Human Values     Hybrid Journal   (Followers: 13, SJR: 1.197, h-index: 49)
Agroforestry Systems     Hybrid Journal   (Followers: 19, SJR: 0.64, h-index: 56)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 10, SJR: 1.732, h-index: 59)
AI & Society     Hybrid Journal   (Followers: 7, SJR: 0.171, h-index: 19)
AIDS and Behavior     Hybrid Journal   (Followers: 13, SJR: 2.006, h-index: 71)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 4, SJR: 0.566, h-index: 18)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.388, h-index: 22)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 0.868, h-index: 20)
Algorithmica     Hybrid Journal   (Followers: 8, SJR: 0.898, h-index: 56)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.183, h-index: 20)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 0.729, h-index: 20)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3, SJR: 1.392, h-index: 32)
AMBIO     Hybrid Journal   (Followers: 15, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 15, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 24, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 7, SJR: 0.634, h-index: 13)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 12, SJR: 0.283, h-index: 3)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.175, h-index: 13)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.558, h-index: 35)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.293, h-index: 13)
American Sociologist     Hybrid Journal   (Followers: 14, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.362, h-index: 83)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.21, h-index: 37)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 31, SJR: 1.096, h-index: 123)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.301, h-index: 26)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.212, h-index: 69)
Animal Cognition     Hybrid Journal   (Followers: 16, SJR: 1.122, h-index: 55)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.156, h-index: 4)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.377, h-index: 32)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.504, h-index: 14)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.167, h-index: 26)
Annals of Behavioral Medicine     Hybrid Journal   (Followers: 11, SJR: 2.112, h-index: 98)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.182, h-index: 94)
Annals of Combinatorics     Hybrid Journal   (Followers: 3, SJR: 0.849, h-index: 15)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Dyslexia     Hybrid Journal   (Followers: 9, SJR: 0.857, h-index: 40)
Annals of Finance     Hybrid Journal   (Followers: 28, SJR: 0.686, h-index: 14)
Annals of Forest Science     Hybrid Journal   (Followers: 6, SJR: 0.929, h-index: 57)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.136, h-index: 23)
Annals of Hematology     Hybrid Journal   (Followers: 14, SJR: 1.117, h-index: 62)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 7, SJR: 0.593, h-index: 42)
Annals of Microbiology     Hybrid Journal   (Followers: 10, SJR: 0.402, h-index: 26)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.68, h-index: 45)
Annals of Operations Research     Hybrid Journal   (Followers: 8, SJR: 1.186, h-index: 78)
Annals of Ophthalmology     Hybrid Journal   (Followers: 12)
Annals of Regional Science     Hybrid Journal   (Followers: 7, SJR: 0.405, h-index: 42)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 10, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 15, SJR: 1.902, h-index: 127)
Annals of Telecommunications     Hybrid Journal   (Followers: 7, SJR: 0.315, h-index: 25)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.931, h-index: 31)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.992, h-index: 87)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.14, h-index: 57)
APOPTOSIS     Hybrid Journal   (Followers: 8, SJR: 1.554, h-index: 87)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.354, h-index: 27)
Applications of Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.274, h-index: 20)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 44, SJR: 0.575, h-index: 80)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 17, SJR: 0.267, h-index: 26)
Applied Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 48, SJR: 0.705, h-index: 35)
Applied Entomology and Zoology     Partially Free   (Followers: 3, SJR: 0.554, h-index: 34)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.323, h-index: 9)
Applied Geophysics     Hybrid Journal   (Followers: 8, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 11, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.358, h-index: 34)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4, SJR: 0.955, h-index: 33)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.275, h-index: 8)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.37, h-index: 26)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 62, SJR: 1.262, h-index: 161)
Applied Physics A     Hybrid Journal   (Followers: 7, SJR: 0.535, h-index: 121)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 23, SJR: 0.983, h-index: 104)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.677, h-index: 47)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 11, SJR: 0.288, h-index: 15)
Applied Solar Energy     Hybrid Journal   (Followers: 17, SJR: 0.251, h-index: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4, SJR: 0.351, h-index: 9)
Aquaculture Intl.     Hybrid Journal   (Followers: 22, SJR: 0.613, h-index: 40)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 32, SJR: 0.646, h-index: 44)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.764, h-index: 39)
Aquatic Sciences     Hybrid Journal   (Followers: 13, SJR: 1.172, h-index: 53)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.345, h-index: 20)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 1, SJR: 0.417, h-index: 16)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 23, SJR: 1.056, h-index: 15)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.397, h-index: 13)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.597, h-index: 29)
Archival Science     Hybrid Journal   (Followers: 56, SJR: 0.804, h-index: 22)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 8, SJR: 0.28, h-index: 15)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1, SJR: 0.946, h-index: 23)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 4.091, h-index: 66)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.865, h-index: 40)
Archives and Museum Informatics     Hybrid Journal   (Followers: 133)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4, SJR: 2.841, h-index: 40)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 0.9, h-index: 65)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 11, SJR: 0.846, h-index: 84)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 17, SJR: 0.695, h-index: 47)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.702, h-index: 85)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 56)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 1.092, h-index: 13)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 9, SJR: 1.198, h-index: 74)
Archives of Toxicology     Hybrid Journal   (Followers: 16, SJR: 1.595, h-index: 76)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 1.086, h-index: 90)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 14, SJR: 1.264, h-index: 50)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 1.2, h-index: 42)
ArgoSpine News & J.     Hybrid Journal   (SJR: 0.102, h-index: 3)
Argumentation     Hybrid Journal   (Followers: 5, SJR: 0.295, h-index: 18)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.948, h-index: 22)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.797, h-index: 17)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.145, h-index: 8)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 10, SJR: 0.288, h-index: 25)
Artificial Intelligence Review     Hybrid Journal   (Followers: 14, SJR: 0.948, h-index: 48)
Artificial Life and Robotics     Hybrid Journal   (Followers: 8, SJR: 0.231, h-index: 14)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.247, h-index: 9)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.371, h-index: 17)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 15, SJR: 1.676, h-index: 50)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 12, SJR: 0.353, h-index: 13)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.19, h-index: 15)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 20, SJR: 1.006, h-index: 14)
Asian Business & Management     Hybrid Journal   (Followers: 8, SJR: 0.41, h-index: 10)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 7)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.263, h-index: 8)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 2, SJR: 0.681, h-index: 15)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.195, h-index: 5)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  

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Journal Cover Acta Physiologiae Plantarum
  [SJR: 0.551]   [H-I: 39]   [2 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1861-1664 - ISSN (Online) 0137-5881
   Published by Springer-Verlag Homepage  [2352 journals]
  • Transcriptome of wax apple ( Syzygium samarangense ) provides insights
           into nitric oxide-induced delays of postharvest cottony softening
    • Authors: Fahe Chen; Yuqi Hao; Zhenzhen Yin; Guangbin Wu; Xingxu Jiang
      Abstract: Wax apple (Syzygium samarangense) is an important tropical fruit crop in Southeast Asia. The rapid cottony softening that occurs after harvest significantly influences the nutrition, flavour and market value of the fruit. Nitric oxide (NO) fumigation has been used to delay the cottony softening process in wax apple; however, the underlying molecular mechanisms at the gene regulation level are poorly understood. In this study, we first sequenced and de novo assembled the wax apple fruit transcriptome using the Illumina Hiseq2000 platform. Meanwhile, we compared the gene expression profiles between NO treatment and control wax apples at different postharvest storage periods using digital gene expression (DGE). This study developed transcriptome data resources for wax apple fruit and provided a foundation for understanding the molecular mechanisms underlying NO-induced cottony softening delay. RNA-Seq generated 5.9 G raw data, which were then de novo assembled into 54,536 unigenes with an N50 length of 1724 bp. 21,433 Unigenes were annotated by the nr database and 3044 were successfully annotated by all databases. The dynamic analysis of the gene expression patterns suggested that NO-induced delays of cottony softening occur in wax apple via the regulation of cell wall degradation, carbohydrate metabolism, oxidation–reduction and plant hormone signal transduction pathways. These results provide a reference for the study of complicated metabolism in non-model perennial species.
      PubDate: 2017-11-13
      DOI: 10.1007/s11738-017-2569-4
      Issue No: Vol. 39, No. 12 (2017)
  • Analysis of miRNA-seq combined with gene expression profile reveals the
           complexity of salinity stress response in Oryza sativa
    • Authors: Qingwei Wang; Tianlong Geng; Shuhua Zhu; Rui Li; Yongao Tong; Shenghua Wang; Fang Chen; Lin Tang; Yang He
      Abstract: High salinity is a major abiotic stressor that affects crop productivity and quality. While proper seedling growth is critical for crop reproduction under high salinity stress. Nowadays, genes/miRNAs expression is used for studying salinity stress response in rice seedlings. However, analysis of miRNA combined with gene expression is rare. To this end, we used miRNA-seq and gene expression profile to ascertain 6335 genes (3276 genes up-regulated, 3059 genes down-regulated) and 126 miRNAs (47 miRNAs up-regulated, 79 miRNAs down-regulated) that respond to salinity stress in rice seedlings. We then used these 126 miRNAs (including the novel miRNA osa-Chr12_1506) to identify 121 differentially expressed predicted target genes. In addition, we identified 34 miRNA-target RNA pairs, consisting of 9 differentially expressed miRNAs with complementary expression patterns. Combined with previous studies, we proposed a simple model for the molecular mechanism of a 12-h salinity stress response in rice seedlings. The findings lead to a deeper understanding of the function of miRNAs and genes that respond to salinity, and contributed to the elucidation of the complex mechanisms activated by salinity stress.
      PubDate: 2017-11-13
      DOI: 10.1007/s11738-017-2570-y
      Issue No: Vol. 39, No. 12 (2017)
  • Comparative proteomics analysis of young spikes of wheat in response to
           Fusarium graminearum infection
    • Authors: Lina Ding; Ming Li; Peng Li; Jun Cao
      Abstract: To investigate signaling events and defense responses in wheat–Fusarium graminearum interaction, the proteomes of young spikes with and without 24 h of F. graminearum inoculation were investigated in the resistant wheat variety Sumai 3 and the susceptible Huaimai 27. Totally 96 protein spots displayed differential expressions in one or two materials after inoculation. 65 of them were identified through mass spectrometry analysis. These proteins can be functionally classified into 12 categories and most of them participate in defense response and signaling. Our study revealed an accumulation of defense/stress response proteins, suppression of protein synthesis and photosynthesis, and changes in basal and energy metabolisms during compatible and incompatible interactions. However, differential regulation of hormone signaling, proteasome-mediated proteolysis, nitrogen metabolism, transcription, and protein modification was observed between two interactions. This result was further confirmed by analyzing the corresponding genes of 19 important proteins from six functional groups at the mRNA level. In addition, the resistant and susceptible wheat varieties showed differences in antioxidant enzymes activities and malondialdehyde contents 24-h postinoculation. Overall, the current study allows us to further dissect the possible metabolism and regulation progresses activated in F. graminearum-treated wheat spikes, and offers new understanding of mechanisms underlying wheat scab resistance.
      PubDate: 2017-11-11
      DOI: 10.1007/s11738-017-2575-6
      Issue No: Vol. 39, No. 12 (2017)
  • The deterioration of Moringa oleifera Lam. seeds in the course of storage
           involves reserve degradation
    • Authors: Danilo Flademir Alves de Oliveira; Saniely Maria Bezerra de Melo; Ana Paula Avelino; Cristiane Elizabeth Costa de Macêdo; Mauro Vasconcelos Pacheco; Eduardo Luiz Voigt
      Abstract: Seed deterioration in the course of storage may involve hydrolytic reactions. Hence, we aimed to evaluate viability, vigour, contents of reserves and metabolites, and activities of hydrolytic enzymes in Moringa oleifera Lam. seeds during storage under controlled conditions. Seeds were packaged in semipermeable plastic and maintained in a growth chamber (27 ± 2 °C and RH 60–65%) and under refrigeration (4 ± 2 °C and RH 20–25%) for 18 months. Samples were taken at the start of the experiment and every 3 months. During the first 12 months, water content, viability, and vigour remained almost unaffected, while the content of neutral lipids, starch, soluble sugars and free amino acids did not reduce in the seeds kept under refrigeration. After this period, the loss of viability and vigour was accompanied by the degradation of storage lipids, storage proteins, and non-reducing sugars associated with the increase of lipase and acid protease activity in both environmental conditions. As the seed water content remained below 8% in the course of the experiment, we suggest that non-enzymatic hydrolysis might play a role in the deterioration of M. oleifera seeds during storage. At least for planting, we recommend that M. oleifera seeds be kept at low relative humidity under refrigeration for up to 12 months.
      PubDate: 2017-11-10
      DOI: 10.1007/s11738-017-2572-9
      Issue No: Vol. 39, No. 12 (2017)
  • Biology, agricultural impact, and management of Cyperus rotundus L.: the
           world’s most tenacious weed
    • Authors: Arslan Masood Peerzada
      Abstract: Purple nutsedge (Cyperus rotundus L.), a troublesome weed, is economically damaging weed, which is widely naturalized in the tropical and subtropical regions of the world. This weed has been reported to cause 20–90% yield losses in various agronomic and horticultural crops across the world. Perennial nature, genetic diversity, ability to tolerate adverse climatic conditions, high rate of reproduction, ease-of-dispersion, strong competitive abilities, and allelopathic potential assist this weed to thrive in a range of agro-climatic regions. Routine cultural approaches, including crop rotation, crop choice, and mechanical cultivation, are ineffective in achieving season-long management of C. rotundus. Pre-emergent and post-emergent herbicides, as well as myco-herbicides, can control its growth but fail to limit the regenerative capacity and tuber viability of C. rotundus in the long term. Integration of herbicides with tillage operations during summer fallows would be a reliable option to desiccate the tubers and rhizomes of C. rotundus. Furthermore, preventive measures as well as complete destruction of nascent foci would be helpful in preventing future spread of this weed. This review will help researchers and scientists in understanding the reproductive biology and future threats of C. rotundus, leading towards the development of improved control methodologies. The information presented in this article will also enable researchers and growers to address the prevailing gaps in the eco-biology of this weed for the long-term control of C. rotundus in economically important field crops.
      PubDate: 2017-11-10
      DOI: 10.1007/s11738-017-2574-7
      Issue No: Vol. 39, No. 12 (2017)
  • Identification and comparative analysis of Brassica juncea
           pathogenesis-related genes in response to hormonal, biotic and abiotic
    • Authors: Sajad Ali; Zahoor Ahmad Mir; Anshika Tyagi; Javaid A. Bhat; Narayanappa Chandrashekar; Pradeep Kumar Papolu; Sandhya Rawat; Anita Grover
      Abstract: Pathogenesis-related proteins (PRs) are the antimicrobial proteins which are commonly used as signatures of defense signaling pathways and systemic acquired resistance. However, in Brassica juncea most of the PR proteins have not been fully characterized and remains largely enigmatic. In this study, full-length cDNA sequences of SA (PR1, PR2, PR5) and JA (PR3, PR12 and PR13) marker genes were isolated from B. juncea and were named as BjPR proteins. BjPR proteins showed maximum identity with known PR proteins of Brassica species. Further, expression profiling of BjPR genes were investigated after hormonal, biotic and abiotic stresses. Pre-treatment with SA and JA stimulators downregulates each other signature genes suggesting an antagonistic relationship between SA and JA in B. juncea. After abscisic acid (ABA) treatment, SA signatures were downregulated while as JA signature genes were upregulated. During Erysiphe cruciferarum infection, SA- and JA-dependent BjPR genes showed distinct expression pattern both locally and systemically, thus suggesting the activation of SA- and JA-dependent signaling pathways. Further, expression of SA marker genes decreases while as JA-responsive genes increases during drought stress. Interestingly, both SA and JA signature genes were induced after salt stress. We also found that BjPR genes displayed ABA-independent gene expression pattern during abiotic stresses thus providing the evidence of SA/JA cross talk. Further, in silico analysis of the upstream regions (1.5 kb) of both SA and JA marker genes showed important cis-regulatory elements related to biotic, abiotic and hormonal stresses.
      PubDate: 2017-11-08
      DOI: 10.1007/s11738-017-2565-8
      Issue No: Vol. 39, No. 12 (2017)
  • Implications of terminal oxidases in the regulation of soybean
           photosynthetic performance under different light intensities
    • Authors: Xin Sun; Ming-Jie Liu; Ming-Yan Yang; Jing Lu; Jun-Bo Du; Kai Shu; Xiao-Chun Wang; Wen-Yu Yang
      Abstract: Soybean [Glycine max (L.) Merr.] is a widely cultivated crop, whose growth and development are usually influenced by fluctuating light environment in fields. In the present study, two soybean cultivars (Nandou12 and Nan 032-4) were selected to study the regulatory mechanisms of capability to do photosynthetic work under different light intensities. Results showed that the net photosynthetic rate (P n ) of Nandou 12, which has a higher yield in field condition, was significantly higher than that of Nan 032-4 under all the light intensities studied. Measurements on stomatal conductance (G s) and intercellular CO2 concentration (C i) suggested that the difference of P n between these two cultivars was mainly caused by non-stomatal factors. Transcript detection found that the expression of genes encoding plastid terminal oxidase (PTOX) and alternative oxidase (AOX), which represent the terminal oxidases of chlororespiration in chloroplasts and alternative respiration in mitochondria, respectively, was up-regulated in both cultivars when light intensity increased, implying potential roles of these two terminal oxidases in photosynthetic regulation. Further analysis showed that the expression level of PTOX increased more obviously in Nandou 12, together with higher non-photochemical quenching (NPQ) and higher activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX) than that in Nan 032-4, when light intensity increased. However, Nan 032-4 performed a more obvious up-regulation of AOX genes, as well as higher activities of NAD-malate dehydrogenase (MDH) and NADP-MDH than Nandou 12, when light intensity increased. These distinctions were consequently suggested to be potential reasons for the difference of photosynthetic performance between two soybean cultivars.
      PubDate: 2017-11-08
      DOI: 10.1007/s11738-017-2568-5
      Issue No: Vol. 39, No. 12 (2017)
  • Exogenous ethylene enhanced the cadmium resistance and changed the
           alkaloid biosynthesis in Catharanthus roseus seedlings
    • Authors: Qi Chen; Kexin Wu; Zhonghua Tang; QingXi Guo; Xiaorui Guo; Hongzheng Wang
      Abstract: Cadmium (Cd) is not an essential nutrition element to plants and high concentration of Cd in the environment causes severe damage to plants. It is reported that the gas phytohormone ethylene plays important roles in plant responses to Cd stress. However, whether plant secondary metabolism is involved in this process remains to be investigated. Here, the regulations of exogenous ethylene on internal Cd accumulation and terpenoid indole alkaloids (TIAs) biosynthesis in the medicinal plant Catharanthus roseus (L.) G. Don (C. roseus) under Cd stress condition were explored. Our results showed that Cd treatment inhibited biomass accumulation, increased Cd accumulation and H2O2 and malondialdehyde (MDA) productions. Simultaneously, Cd treatment enhanced yields of vindoline, catharanthine and vinblastine, as well as the gene expressions of TIAs pathway enzymes at transcriptional level. Exogenous ethylene application significantly reduced the Cd content in whole plants and the H2O2 and MDA productions in roots and leaves, indicating that Cd stress in C. roseus was effectively alleviated by the ethylene application. It was interesting to find that exogenous ethylene promoted the Cd transport from roots to leaves and the value of Cd TF (transfer factor) was increased from 0.41 to 0.53. In leaves, the transcriptional expression of metallothionein (MT) was up-regulated by exogenous ethylene application, together with the increase of Cd accumulation. Additionally, exogenous ethylene reduced the TIAs productions, with an exception of catharanthine in leaves. The transcriptional expressions of alkaloid transporters, triose phosphate translocator (MDR) and multidrug resistance (TPT) were also up-regulated in leaves by exogenous ethylene, in accordance with the change of catharanthine biosynthesis. All of our results showed that exogenous ethylene could elevate the Cd resistance of C. roseus and effectively influence TIAs biosynthesis in C. roseus. Regulations of ethylene on the transcriptional expressions of MT, pathway enzymes and alkaloid transporters might be involved in this process.
      PubDate: 2017-11-08
      DOI: 10.1007/s11738-017-2567-6
      Issue No: Vol. 39, No. 12 (2017)
  • A comparative proteome assay on the quality of yardlong bean pods as
           influenced by the organic and inorganic nourishment systems
    • Authors: Deepthi K. Kumar; Deepu Mathew; P. A. Nazeem; P. S. Abida; C. George Thomas
      Abstract: The assumption of enhanced nutritional quality of food produced through the organic systems against the inorganic systems is under constant challenge. Changes in nutritional quality under varying methods of crop nourishment, if any, should be through the differential translation of proteins and hence should be reflected in the proteome profile. The present study was undertaken to understand the effect of organic and inorganic crop nourishments on the nutritional quality of yardlong bean, through two-dimensional proteome profiling. Yardlong beans were raised separately under organic and inorganic nourishment and the proteome of pods was profiled. The differentially expressed and upregulated proteins from immature and mature pods from both the systems were characterized through MALDI-ToF/MS. Under both the production systems, differentially expressed proteins were the contributors to antioxidant properties at different pod maturity stages and pod quality was proven to be independent of crop nourishment system. This study does not support the hypothesis that organically produced foods will be nutritionally superior.
      PubDate: 2017-11-07
      DOI: 10.1007/s11738-017-2564-9
      Issue No: Vol. 39, No. 12 (2017)
  • Cold-induced physiological and biochemical responses of three grapevine
           cultivars differing in cold tolerance
    • Authors: Shima Sadat Beheshti Rooy; Ghasem Hosseini Salekdeh; Mehdi Ghabooli; Mansour Gholami; Rouhollah Karimi
      Abstract: In this study the cold tolerance potential of three Vitis vinifera cultivars including ‘Red Sultana’, ‘White Sultana,’ and ‘Flame Seedless’ was evaluated under greenhouse condition. After 15 leaves stage in average, the grapevine plants were subjected to cold stress regimes (4, 0 and − 4 °C) and compared with control plants (24 °C). A clear increase in leaf electrolyte leakage (EL), thiobarbituric acid reactive substances (TBARS), and H2O2 concentrations was observed with decreasing temperature from 4 to − 4 °C in all grapevine cultivars. Chilled plants showed marked increases in their abscisic acid (ABA), soluble sugars, and proline contents in compared to control vines. Upon exposure to cold stress, the EL, TBARS, H2O2, and relative water content of ‘Red Sultana’ were found to be lower compared to ‘White Sultana’ and ‘Flame Seedless’. Under 0 °C condition, ‘Red Sultana’ had the highest superoxide dismutase, guaiacol peroxidase and catalase activities, which was approximately twofold higher than those of all other cultivars. Soluble sugars such as glucose, fructose, and sucrose increased from 4 to − 4 °C. These increments were higher in ‘Red Sultana’ compared to other cultivars which was concomitant with higher accumulation of endogenous ABA concentration in this cultivar. Higher accumulation of ABA and soluble sugars in ‘Red Sultana’ confirmed the key roles of these compounds in cold tolerance which could be applied as a cold tolerance marker for early selection of grapevine cultivars with the aim to establish vineyards in cold winter regions.
      PubDate: 2017-11-03
      DOI: 10.1007/s11738-017-2561-z
      Issue No: Vol. 39, No. 12 (2017)
  • Arsenic-induced oxidative stress and thiol metabolism in two cultivars of
           rice and its possible reversal by phosphate
    • Authors: Jayeeta Saha; Barsha Majumder; Bushra Mumtaz; Asok K. Biswas
      Abstract: Groundwater arsenic contamination, a grave threat in Bangladesh and parts of West Bengal (India), causes biochemical and physiological disorders in plants. Arsenic and phosphorus (plant macronutrient) have similar electronic configurations, resulting in their competitive interaction for the same uptake system in plant roots. Arsenic exposure initiates production of reactive oxygen species. Hence, the contents of proline, hydrogen peroxide, glutathione, ascorbate, and activities of ascorbate peroxidase, catalase were investigated in 21-day-old rice seedlings (cv. Khitish and cv. Nayanmani). Additionally, impact of arsenate together with phosphate on growth, total glutathione contents and activity of its regulatory enzymes were altered in the test cultivars to varying extents. Inductively coupled plasma-optical emission spectroscopic study of arsenic content in the root and shoot also showed variable uptake of arsenic by the two cultivars. Arsenate reductase enzyme activity primarily observed in the root, also differed from one cultivar to the other. Different phytochelatin (PCs) levels were recorded in the shoot and root of the cultivars under arsenate and phosphate treatment by reverse phase-high performance liquid chromatography. PC content increased with increasing arsenate concentrations, whereas phosphate and arsenate co-application resulted in reduced PC levels. The degree of elevation in PC contents varied significantly in the cultivars. Based on the above-mentioned parameters, cv. Khitish appeared to be more susceptible to arsenic toxicity than cv. Nayanmani which showed selective tolerance to the said metal stress.
      PubDate: 2017-11-02
      DOI: 10.1007/s11738-017-2562-y
      Issue No: Vol. 39, No. 12 (2017)
  • Comparative proteomic analysis of the response of fibrous roots of
           nematode-resistant and -sensitive sweet potato cultivars to root-knot
           nematode Meloidogyne incognita
    • Authors: Joon Ha; Jong Chan Won; Yong Hak Jung; Jung-Wook Yang; Hyeong-Un Lee; Ki Jung Nam; Sung-Chul Park; Jae Cheol Jeong; Shin-Woo Lee; Dong Woon Lee; Jung-Sung Chung; Jeung Joo Lee; Yun-Hee Kim
      Abstract: As a major root-knot nematode (RKN), Meloidogyne incognita causes serious losses in the yield of sweet potato (Ipomoea batatas L.). To successfully colonize the host plant, RKNs elicit changes of dramatic physiological and morphological features in the plants. The expression of several genes is regulated as the nematode establishes its feeding site. Therefore, in this study, we analyzed the proteomes in the fibrous roots of sweet potato plants by an infection of RKN to understand the effect of the infection on the plant root regions. This study revealed differences in proteomes of the RKN-resistant sweet potato cultivar Juhwangmi and RKN-sensitive cultivar Yulmi. During plant growth, Juhwangmi plants were shown to be more resistant to M. incognita than Yulmi plants. No M. incognita egg formation was observed in Juhwangmi plants, whereas 587 egg masses were formed in Yulmi plants. Differentially expressed 64 spots were confirmed by proteomic analysis using 2-D gel electrophoresis with three spots up-regulated in the two cultivars during RKN infection. Of these 64 protein spots, 20 were identified as belonging to such different functional categories as the defense response, cell structure, and energy metabolism. This study provides insight into the molecular and biochemical mechanics of the defense response and metabolism of sweet potato plant during nematode invasion. We anticipate that this study will also provide a molecular basis for useful crop breeding and the development of nematode-tolerant plants.
      PubDate: 2017-11-01
      DOI: 10.1007/s11738-017-2560-0
      Issue No: Vol. 39, No. 12 (2017)
  • Selection of drought tolerant and sensitive genotypes from wheat DH
    • Authors: Éva Nagy; Csaba Lantos; János Pauk
      Abstract: Drought has significant effect on wheat production by decreasing grain yield. Phenotyping the populations is a useful tool for understanding the interactions between phenotype and genotype. 135 doubled haploid (DH) genotypes and their parental varieties Plainsman (Pl) and Cappelle Desprez (CD) were phenotyped in glasshouse under well-watered (WW) and drought-stress (DS) conditions. The response of plant height, heading time, aboveground biomass, grain yield, root dry mass harvest index (HI) under both conditions, and stress tolerance index (STI) and water consumption in WW conditions was studied. We found 20% decrease in the plant growth, 66% decrease in the aboveground biomass, and 77% decrease in the grain yield. Under WW conditions, high water consumption was not related to high yields, STI, and HI. The tolerant and the sensitive genotypes were selected. In the WW and water consumption treatment, the sensitive genotype group had better grain yield performance, but under DS, the tolerant group had higher grain yield. The average yield loss was 59% in the tolerant group compared to the WW treatment, and the sensitive yield loss was 68%. Correlation was found between the grain yield and root dry mass in the tolerant group. There was significant difference between the tolerant and sensitive groups on water consumption, as the sensitive genotypes had higher water need. We found strong positive correlation between the water consumption and the grain yield in the tolerant group. This study showed that the tolerant genotypes had improved water regulating efficiency.
      PubDate: 2017-10-31
      DOI: 10.1007/s11738-017-2554-y
      Issue No: Vol. 39, No. 12 (2017)
  • The occurrence of phosphoenolpyruvate carboxykinase (PEPCK) and enzymes
           related to photosynthesis and organic acid/nitrogen metabolism in apricot
           flowers ( Prunus armeniaca L.)
    • Authors: Franco Famiani; Alessandro Baldicchi; Valeria Casulli; Claudio Di Vaio; Juan G. Cruz-Castillo; Robert P. Walker
      Abstract: This study determined the occurrence of phosphoenolpyruvate carboxykinase (PEPCK) and some enzymes involved in photosynthesis and organic acid/nitrogen metabolism in the different parts of apricot flowers and some other tissues of apricot. Both PEPCK protein and activity were detected in the petal, carpel, stamen filament and in the flesh of both unripe and ripe fruits, but not in the sepal or mature leaf. Both PEPCK polypeptide and activity were most abundant in the flesh of ripe fruits. In floral tissues the photosynthetic enzymes ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and putative plastidic glutamine synthase and plastidic aldolase were most abundant in the sepal in which PEPCK was not detected. The potential functions of PEPCK in the different tissues of apricot are discussed. This study highlights the potential importance of gluconeogenesis in floral metabolism.
      PubDate: 2017-10-26
      DOI: 10.1007/s11738-017-2557-8
      Issue No: Vol. 39, No. 12 (2017)
  • Evaluation of rhizobacteria in upland rice in Brazil: growth promotion and
           interaction of induced defense responses against leaf blast ( Magnaporthe
           oryzae )
    • Authors: Eugenio Miranda Sperandio; Helson Mario Martins do Vale; Marcello de Souza Reis; Marcio Vinícius de Carvalho Barros Cortes; Anna Cristina Lanna; Marta Cristina Corsi de Filippi
      Abstract: Blast and the initial vigor of upland rice plants are the main challenges facing rice crops in Brazilian no-tillage systems. The aim of this study was to evaluate the growth promotion and interactions of defense responses against Magnaporthe oryzae in rice plants treated with rhizobacteria Bacillus sp. (BRM 32110) and Serratia sp. (BRM 32114). The seeds of the rice were microbiolized, and 14 days after the plants emerged, the soil was drenched with rhizobacterial suspensions. Growth promotion was evaluated by root and shoot biomass, root and shoot length, foliar area, and nitrate reductase (NR) activity. The defense response was evaluated by quantification of the rice blast severity (RBS), disease progress, pathogenesis-related protein (PRP) activity, and salicylic acid content (SA). The length and biomass of the roots and shoots and the foliar area of the plants treated with BRM 32114 isolate increased; however, the NR activity was 43% lower compared to the control. Both isolates reduced the severity and progress of the disease. Principal component analysis showed that RBS, β-1,3-glucanase (GLU), peroxidase (POX), and phenylalanine ammonia lyase (PAL) were the main sources of the first components of variance, whereas lipoxygenase (LOX) and SA were the main sources of the second components and were negatively correlated. Serratia sp. isolate BRM 32114 can be used as a growth-promoting agent and has potential for inducing resistance in rice plants. The results suggest that the interaction among the levels and timing of the PRP activity and the levels of SA play important roles in the defense responses against M. oryzae.
      PubDate: 2017-10-24
      DOI: 10.1007/s11738-017-2547-x
      Issue No: Vol. 39, No. 12 (2017)
  • RNA-sequencing predicts three novel genes in response to drought in
           electron beam irradiation treated tobacco
    • Authors: Huijuan Yang; Jing Wang; Li Zhao; Yan Zhou; Hongzhi Shi
      Abstract: Electron beam irradiation (EBI) has protective effects on food storage. This study aimed to investigate drought tolerance of tobacco after EBI treatment. Nicotiana tabacum L. seeds were irradiated with different doses of EBI. Germination percentage (GP) was counted. Phenotype of EBI-treated M1 generation was observed in a drought field. The candidate drought-resistant tobacco line was selected and then drought treated without watering for 8 and 16 days, respectively. Samples at 8 days were collected for RNA-sequencing on the Illumina HiSeqTM 2500 platform. Then, differentially expressed genes (DEGs) were selected, followed by functional enrichment analysis. EBI with 500 Gy was selected as the optimal dose. Five lines: M1-7, M1-9, M1-10, M1-12, and M1-40 were candidate drought-resistant lines based on phenotype observation. Among them, M2-12 and M2-40 had high GPs. By comparing their M1 phenotypes, M2-12 was identified as the final candidate drought-resistant line. After drought treatment, M2-12 showed a wavier leaf margin than control and kept a well growth condition during the whole period. A total of 3547 DEGs were identified, and the up-regulated DEGs were significantly enriched in functions like “response to water deprivation (LOC107782385)”, “response to gibberellin (LOC104231633, LOC104219851)”, and “response to jasmonic acid (JA) (LOC104219851)”. Results of qRT-PCR confirmed that LOC104231633, LOC107782385, and LOC104219851 were up-regulated under drought stress. In conclusion, EBI may be a promising way to generate drought tolerant mutant tobacco. The above three genes may be drought-inducible and may involve in JA- and gibberellin-mediated signaling pathways.
      PubDate: 2017-10-23
      DOI: 10.1007/s11738-017-2553-z
      Issue No: Vol. 39, No. 12 (2017)
  • Root tip structure and volatile organic compound responses to drought
           stress in Masson pine ( Pinus massoniana Lamb.)
    • Authors: Wenxuan Quan; Guijie Ding
      Abstract: The Masson pine (Pinus massoniana Lamb.) has a relatively strong tolerance to stressors such as acid rain, drought, and phosphorus deficiency. Previous studies have mainly focused on morphological, physiological, and metabolic responses in the needles of the Masson pine. However, there has been little study of the effects of drought stress on root tip structure or the composition of volatile organic compounds (VOCs) in the root tip. Therefore, this work aimed to evaluate the VOCs and anatomical growth responses of Masson pine root tips to drought stress. The results showed that (1) drought stress inhibited increases in root biomass, root growth, and lateral root number, and damaged and significantly deformed the root apical structure; (2) the relative contents of monoterpenes decreased with the intensity of drought stress, but the relative content of sesquiterpenes increased. (3) The ratio of sesquiterpenes to monoterpenes in the root tip was approximately 1:2 in the absence of stress, and became 3:1 under severe drought stress. The results indicate changes of secondary metabolism in the root tip of the Masson pine in response to drought stress.
      PubDate: 2017-10-23
      DOI: 10.1007/s11738-017-2558-7
      Issue No: Vol. 39, No. 12 (2017)
  • Proton kinetics through the cuticle layer in maize
    • Authors: Monika Olszewska; Adam Konefał; Mariusz Pietruszka
      Abstract: A Monte Carlo simulation was used to determine the dependence between the thickness of the cuticle layer of coleoptiles and the spectra of the H+ ions (i.e., protons) passing through this layer, which is treated as a potential barrier. The apparently simplistic model of a walled cylinder filled with H+ ions propagating through the cuticle layer was solved in silico. We showed that the thickness of the cuticle layer clearly influences the intensity of the efflux of protons, which changes the pH of the surrounding solution. Then, diffusion and cross-correlation data for maize (Zea mays L.) coleoptile growth and H+ ion extrusion were probed in an experiment and compared with the Monte Carlo computation results. Ex vivo experiments for the control (APW), auxin (IAA) and fusicoccin (FC) were conducted. The transition from time-delayed pH—(abrasion time) cross-correlation to proton efflux that was not retarded was obtained, thus confirming the canvas that constitutes the acid growth hypothesis and the rationale that was accepted for the derivation of the ‘equation of state’ for plants.
      PubDate: 2017-10-23
      DOI: 10.1007/s11738-017-2559-6
      Issue No: Vol. 39, No. 12 (2017)
  • Hairy-root cultures of Achyranthes aspera Linn. as a novel route for the
           production of 20-hydroxyecdysone
    • Authors: Reshma John; P. P. Shajitha; Aneesha Devassy; Linu Mathew
      Abstract: An efficient transformation system for hairy-root induction in Achyranthes aspera L. was established and investigated as a novel method for the production of 20-hydroxyecdysone. Four Agrobacterium rhizogenes strains (MTCC 2364, NCIM 5140, A4, and ATCC 15834) were examined for their frequency of transformation in the presence of various concentrations of acetosyringone. Strain ATCC 15834 showed significantly higher transformation efficiency and was capable of inducing hairy roots from different explants (young leaf, hypocotyls, cotyledon, and stem segments) of A. aspera in the presence of 100 µM acetosyringone. The hairy root transformation of the lines (AS001 and AS002) was confirmed by PCR amplification of rol B locus using primers specific for rol B gene. Hairy roots grown in the Murashige and Skoog (MS) liquid medium augmented with 30 g/L sucrose exhibited the highest biomass accumulation and this medium was found to be superior to Gamborg’s B5 medium and Whites root culture medium. HPLC and LC-Q-TOF analyses of the hairy-root extract of A. aspera revealed the ability of hairy-root lines to synthesise the phytoecdysteroid 20-hydroxyecdysone.
      PubDate: 2017-10-22
      DOI: 10.1007/s11738-017-2555-x
      Issue No: Vol. 39, No. 12 (2017)
  • Interplay between nitric oxide, ethylene, and gibberellic acid regulating
           the release of Amaranthus retroflexus seed dormancy
    • Authors: Jan Kępczyński; Danuta Cembrowska-Lech; Paweł Sznigir
      Abstract: A very small percentage, below 10%, of Amaranthus retroflexus seeds were germinated at 25 °C in the light and thus the seeds were considered to be primary dormant. Nitric oxide (NO) applied for only 5 h stimulated germination of these non-deep physiologically dormant seeds. Likewise, ethephon, ethylene, 1-aminocyclopropane-1-carboxylic acid (ACC) and gibberellic acid (GA3) induced dormancy release. The stimulatory effect of NO, ACC, and GA3 on germination was associated with increased ethylene production prior to radicle protrusion. The nitric oxide scavenger, cPTIO, antagonized the stimulatory effect of GA3, ethephon, and ACC on seed germination, indicating that the presence of endogenous NO is required for dormancy release by these compounds. This scavenger inhibited both germination and ethylene production stimulated by NO and GA3. An inhibitor of ethylene binding to its receptor, 2,5-norbornadiene (NBD), antagonized the beneficial effect of ethylene and NO, indicating that ethylene action is necessary for the appearance of seed response to these gases. The ACC synthase inhibitor, aminoethoxyvinylglycine (AVG), and the ACC oxidase inhibitor, α-amino-isobutyric acid (AIB), strengthened the effect of NBD on the germination of NO-pretreated seeds. Induction of germination of dormant seeds by NO, ethephon or GA3 was associated with initiation of the cell cycle prior to radicle protrusion. The data presented indicate NO crosstalk with ethylene and GA3 in regulating dormancy release in A. retroflexus seeds.
      PubDate: 2017-10-22
      DOI: 10.1007/s11738-017-2550-2
      Issue No: Vol. 39, No. 12 (2017)
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