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  Subjects -> AGRICULTURE (Total: 764 journals)
    - AGRICULTURAL ECONOMICS (75 journals)
    - AGRICULTURE (520 journals)
    - CROP PRODUCTION AND SOIL (90 journals)
    - DAIRYING AND DAIRY PRODUCTS (30 journals)
    - POULTRY AND LIVESTOCK (49 journals)

AGRICULTURE (520 journals)                  1 2 3 | Last

Showing 1 - 200 of 263 Journals sorted alphabetically
Aceh International Journal of Science and Technology     Open Access   (Followers: 1)
Acta agriculturae Slovenica     Open Access   (Followers: 3)
Acta Agronomica Hungarica     Full-text available via subscription   (Followers: 1)
Acta Scientiarum. Animal Sciences     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access  
Acta Technologica Agriculturae     Open Access   (Followers: 1)
Acta Universitatis Sapientiae, Alimentaria     Open Access  
Advances in Agriculture     Open Access   (Followers: 5)
Advances in Agriculture & Botanics     Open Access   (Followers: 10)
Advances in Agronomy     Full-text available via subscription   (Followers: 13)
Advances in Life Science and Technology     Open Access   (Followers: 12)
AFBM Journal     Open Access  
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 9)
African Journal of Agricultural Research     Open Access   (Followers: 3)
African Journal of Food Science     Open Access   (Followers: 3)
African Journal of Food, Agriculture, Nutrition and Development     Open Access   (Followers: 14)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 5)
Agra Europe     Full-text available via subscription   (Followers: 3)
Agribusiness : an International Journal     Hybrid Journal   (Followers: 6)
Agricultura Tecnica     Open Access   (Followers: 6)
Agricultura Tropica et Subtropica     Open Access   (Followers: 1)
Agricultura, Sociedad y Desarrollo     Open Access   (Followers: 1)
Agricultural Advances     Open Access   (Followers: 3)
Agricultural and Food Science     Open Access   (Followers: 16)
Agricultural Commodities     Full-text available via subscription  
Agricultural Economics     Hybrid Journal   (Followers: 44)
Agricultural History Review     Full-text available via subscription   (Followers: 5)
Agricultural Research     Hybrid Journal   (Followers: 3)
Agricultural Science     Full-text available via subscription   (Followers: 4)
Agricultural Science     Open Access   (Followers: 1)
Agricultural Sciences     Open Access   (Followers: 7)
Agricultural Sciences in China     Full-text available via subscription   (Followers: 3)
Agricultural Systems     Hybrid Journal   (Followers: 28)
Agricultural Water Management     Hybrid Journal   (Followers: 26)
Agriculture     Open Access   (Followers: 5)
Agriculture & Food Security     Open Access   (Followers: 9)
Agriculture (Poľnohospodárstvo)     Open Access   (Followers: 1)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Food Sciences Research     Open Access   (Followers: 1)
Agriculture and Human Values     Hybrid Journal   (Followers: 12)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 48)
Agriprobe     Open Access  
Agrivita : Journal of Agricultural Science     Open Access   (Followers: 2)
Agro-Science     Full-text available via subscription  
Agroalimentaria     Open Access  
Agrociencia     Open Access   (Followers: 1)
Agrociencia Uruguay     Open Access  
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat     Open Access  
Agronomía Colombiana     Open Access  
Agronomía Costarricense     Open Access   (Followers: 1)
Agronomía Mesoamericana     Open Access  
Agronomie Africaine     Full-text available via subscription  
Agronomy     Open Access   (Followers: 10)
Agrosearch     Open Access   (Followers: 1)
Akademik Ziraat Dergisi     Open Access  
Alinteri Zirai Bilimler Dergisi : Alinteri Journal of Agricultural Sciences     Open Access  
Ambiente & Agua : An Interdisciplinary Journal of Applied Science     Open Access   (Followers: 1)
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 10)
American Journal of Botany     Full-text available via subscription   (Followers: 15)
American Journal of Economics and Sociology     Hybrid Journal   (Followers: 26)
American Journal of Potato Research     Hybrid Journal   (Followers: 2)
American Journal of Rural Development     Open Access   (Followers: 3)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Annales des Sciences Agronomiques     Full-text available via subscription  
Annals of Agricultural and Environmental Medicine     Open Access   (Followers: 1)
Annals of Agricultural Sciences     Open Access   (Followers: 2)
Annals of Silvicultural Research     Open Access   (Followers: 1)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 10)
APCBEE Procedia     Partially Free   (Followers: 1)
Applied Economics Letters     Hybrid Journal   (Followers: 25)
Applied Financial Economics Letters     Hybrid Journal   (Followers: 7)
Arboricultural Journal : The International Journal of Urban Forestry     Hybrid Journal   (Followers: 6)
Archivos de Zootecnia     Open Access   (Followers: 1)
ARO. The Scientific Journal of Koya University     Open Access  
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2)
Asian Economic Papers     Hybrid Journal   (Followers: 4)
Asian Journal of Agricultural Research     Open Access   (Followers: 3)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 1)
Asian Journal of Plant Sciences     Open Access   (Followers: 1)
Australian Cottongrower, The     Full-text available via subscription   (Followers: 1)
Australian Economic Papers     Hybrid Journal   (Followers: 8)
Australian Economic Review     Hybrid Journal   (Followers: 7)
Australian Forest Grower     Full-text available via subscription   (Followers: 2)
Australian Forestry     Full-text available via subscription   (Followers: 2)
Australian Grain     Full-text available via subscription   (Followers: 3)
Australian Holstein Journal     Full-text available via subscription  
Australian Journal of Agricultural and Resource Economics     Hybrid Journal   (Followers: 3)
Australian Journal of Agricultural Engineering     Open Access   (Followers: 1)
Australian Sugarcane     Full-text available via subscription  
Avances en Investigacion Agropecuaria     Open Access   (Followers: 1)
B.E. Journal of Theoretical Economics     Full-text available via subscription  
Bangladesh Agronomy Journal     Open Access  
Bangladesh Journal of Agricultural Research     Open Access   (Followers: 2)
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Bioagro     Open Access   (Followers: 1)
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 4)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 6)
Biodiversity     Hybrid Journal   (Followers: 24)
Biodiversity : Research and Conservation     Open Access   (Followers: 26)
Biological Agriculture & Horticulture : An International Journal for Sustainable Production Systems     Partially Free   (Followers: 11)
Biosystems Engineering     Hybrid Journal   (Followers: 6)
Biotemas     Open Access  
Boletín Semillas Ambientales     Open Access  
Bragantia     Open Access   (Followers: 2)
Brazilian Archives of Biology and Technology     Open Access   (Followers: 1)
British Poultry Science     Hybrid Journal   (Followers: 5)
Buletin Peternakan : Bulletin of Animal Science     Full-text available via subscription  
Buletin Veteriner Udayana     Open Access   (Followers: 1)
Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca : Food Science and Technology     Open Access  
Cahiers Agricultures     Open Access  
California Agriculture     Open Access   (Followers: 1)
Cambridge Journal of Economics     Hybrid Journal   (Followers: 43)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 20)
Capitalism Nature Socialism     Hybrid Journal   (Followers: 11)
Ceiba     Open Access  
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
CERNE     Open Access  
CESifo Economic Studies     Hybrid Journal   (Followers: 7)
Change and Adaptation in Socio-Ecological Systems     Open Access   (Followers: 1)
Chemical and Biological Technologies for Agriculture     Open Access  
Chilean Journal of Agricultural Research     Open Access   (Followers: 1)
Ciencia & Natura     Open Access  
Ciência e Agrotecnologia     Open Access  
Ciencia e investigación agraria     Open Access  
Ciência e Técnica Vitivinícola     Open Access  
Ciencia forestal en México     Open Access  
Ciência Rural     Open Access   (Followers: 2)
Ciencia, Tecnología y Salud     Open Access  
COCOS : The Journal of the Coconut Research Institute of Sri Lanka     Open Access   (Followers: 1)
Coffee Science     Open Access  
Cogent Food & Agriculture     Open Access  
Competition & Change     Hybrid Journal   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 2)
Contributions to Tobacco Research     Open Access   (Followers: 2)
Corps et culture     Open Access   (Followers: 6)
Cuadernos de Desarrollo Rural     Open Access   (Followers: 1)
Cultivos Tropicales     Open Access  
Cultural Geographies     Hybrid Journal   (Followers: 16)
Cultural Sociology     Hybrid Journal   (Followers: 27)
Cultural Studies - Critical Methodologies     Hybrid Journal   (Followers: 15)
Cultural Studies of Science Education     Hybrid Journal   (Followers: 5)
Cultural Trends     Hybrid Journal   (Followers: 13)
Culture & Agriculture     Hybrid Journal   (Followers: 10)
Culture, Agriculture, Food and Environment     Hybrid Journal   (Followers: 6)
Current Life Sciences     Open Access   (Followers: 3)
Current Research in Dairy Sciences     Open Access   (Followers: 5)
Derim     Open Access  
Developments in Agricultural Economics     Full-text available via subscription   (Followers: 4)
Developments in Agricultural Engineering     Full-text available via subscription  
Diatom Research     Hybrid Journal  
Die Bodenkultur : Journal of Land Management, Food and Environment     Open Access  
Dossiers Agraris     Open Access  
Ecological Applications     Full-text available via subscription   (Followers: 118)
Economic Affairs     Hybrid Journal   (Followers: 6)
Economic and Industrial Democracy     Hybrid Journal   (Followers: 8)
Economic Bulletin     Hybrid Journal   (Followers: 4)
Economic Policy     Hybrid Journal   (Followers: 28)
Economic Record     Hybrid Journal   (Followers: 4)
Empirical Economics     Hybrid Journal   (Followers: 8)
Encuentro     Open Access  
Engineering in Agriculture, Environment and Food     Hybrid Journal  
Ensaios e Ciência: Ciências Biológicas, Agrárias e da Saúde     Open Access  
Eppo Bulletin     Hybrid Journal   (Followers: 2)
Ethology     Hybrid Journal   (Followers: 7)
EU agrarian Law     Open Access   (Followers: 3)
Euphytica     Hybrid Journal   (Followers: 7)
Eurochoices     Hybrid Journal   (Followers: 1)
European Agrophysical Journal     Open Access  
European Journal of Agronomy     Hybrid Journal   (Followers: 9)
European Journal of American Culture     Hybrid Journal   (Followers: 2)
European Journal of Health Economics     Hybrid Journal   (Followers: 17)
European Journal of Law and Economics     Hybrid Journal   (Followers: 56)
European Review of Agricultural Economics     Hybrid Journal   (Followers: 11)
EvoDevo     Open Access   (Followers: 2)
Extensão Rural     Open Access   (Followers: 1)
Farmer’s Weekly     Full-text available via subscription  
Farmlink Africa     Full-text available via subscription  
Fitosanidad     Open Access  
Folia Horticulturae     Open Access   (Followers: 1)
Food and Agricultural Immunology     Hybrid Journal   (Followers: 2)
Food and Energy Security     Open Access   (Followers: 4)
Food Biotechnology     Hybrid Journal   (Followers: 11)
Food Economics - Acta Agriculturae Scandinavica, Section C     Hybrid Journal   (Followers: 2)
Food New Zealand     Full-text available via subscription   (Followers: 3)
Food Policy     Hybrid Journal   (Followers: 29)
Forestry Chronicle     Full-text available via subscription   (Followers: 10)
Forum for Health Economics & Policy     Hybrid Journal   (Followers: 7)
Frontiers in Science     Open Access   (Followers: 1)
Frontiers of Agriculture in China     Hybrid Journal   (Followers: 2)
Future of Food : Journal on Food, Agriculture and Society     Open Access   (Followers: 2)
Geoderma     Hybrid Journal   (Followers: 8)
Global Approaches to Extension Practice : A Journal of Agricultural Extension     Full-text available via subscription   (Followers: 1)
Global Economic Review     Hybrid Journal   (Followers: 6)
Global Journal of Agricultural Sciences     Full-text available via subscription  
Hacquetia     Open Access  
Handbook of Agricultural Economics     Full-text available via subscription   (Followers: 4)
Heliyon     Open Access  
Hereditas     Open Access   (Followers: 2)

        1 2 3 | Last

Journal Cover American Journal of Potato Research
  [SJR: 0.558]   [H-I: 35]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1874-9380 - ISSN (Online) 1099-209X
   Published by Springer-Verlag Homepage  [2335 journals]
  • Sequence-Specific Nucleases for Genetic Improvement of Potato
    • Authors: Nathaniel M. Butler; David S. Douches
      Pages: 303 - 320
      Abstract: Abstract Genome editing using sequence-specific nucleases (SSNs) is rapidly becoming a standard tool for genetic engineering in crop species. The implementation of zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs) and CRISPR/Cas (clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated systems (Cas)) for inducing double-strand breaks enables targeting of virtually any sequence for genetic modification. Targeted mutagenesis via nonhomologous end-joining (NHEJ) and gene targeting via homologous recombination (HR) have been demonstrated in a number of plant species but reports have been limited in vegetatively propagated crops, such as potato (Solanum tuberosum Group Tuberosum L.). This review provides a historical overview of genetic engineering in agriculture, applications of SSN technologies for genome editing in plant species, and prospects of using SSNs for genetic improvement of potato.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9513-9
      Issue No: Vol. 93, No. 4 (2016)
       
  • Isolation, Purification and Characterization of Phytotoxins Produced by
           Rhizoctonia solani AG-3, the Cause Agent of Potato Stem Canker
    • Authors: Frederick Kankam; Huizhen Qiu; Lumei Pu; Haitao Long; Chunhong Zhang; Jing He; Huixiu Zhang
      Pages: 321 - 330
      Abstract: Abstract Studies were conducted to isolate and characterize the phytotoxins extracted from culture filtrates of Rhizoctonia solani isolate anastomosis group 3 (AG-3) using preparative thin layer chromatography (TLC) method. The culture filtrates of R. solani contain a toxic substance that causes canker on potato stems. Eight toxin fractions were collected by column layer chromatography but only four spots were obtained in the TLC analysis. All the four toxin fractions (third, fourth, sixth and seventh fractions) were recognised to have phytotoxic activity. Fourier-transform infrared spectroscopy (FTIR), high performance liquid chromatography (HPLC) and 1H and 13C NMR spectral techniques were used to characterize the phytotoxin. The major functional groups identified from FTIR spectrum includes 2962.1 cm−1 (−CH3), 1465.6 cm−1 (−CH2−), 1727.9 cm−1 (C = O), 1729.8 cm−1 (−COOH) and 1124.3 cm−1 (−OH). Result from HPLC, 1H NMR and 13C NMR showed phytotoxic fractions of 3-methylthiopropionic acid (3-MTPA) and 3-methylthioacrylic acid (3-MTAA). The results of this investigation add to the body of evidence that multiple related compounds are involved in R. solani disease development.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9506-8
      Issue No: Vol. 93, No. 4 (2016)
       
  • Differential Sensitivity of Genetically Related Potato Cultivars to
           Treatments Designed to Alter Apical Dominance, Tuber Set and Size
           Distribution
    • Authors: Derek J. Herman; Lisa O. Knowles; N. Richard Knowles
      Pages: 331 - 349
      Abstract: Abstract The cultivar, Bondi, was selected from a cross between Ranger Russet (maternal parent) and Karaka and is currently being evaluated as a frozen processing cultivar. Relative to Ranger, Bondi produces vigorous foliar growth, low tuber set and high yields of large tubers that frequently exceed optimum size for seed and processing markets. We evaluated the relative efficacies of gibberellin (GA), cytokinin (benzyladenine (BA)) and seed aging for altering apical dominance, tuber set and size distribution of these genetically related cultivars. GA applied to cut seed prior to planting hastened emergence, reduced apical dominance, increased tuber set and decreased average tuber size; however, the optimal concentration to maximally shift tuber size distribution without decreasing marketable yield was 4–5-fold greater for Bondi than Ranger. BA marginally hastened plant emergence (Bondi) and decreased apical dominance (both cultivars) only when combined with GA, but had no further effects on tuber set, yields or tuber size distributions in either cultivar. Age-priming Ranger seed for 700 degree days (DD) at 32 °C during storage shifted the tuber size distribution to a much greater extent than 2 mg L−1 GA (optimal concentration) without reducing marketable yield. The combined age and GA treatment resulted in no further shift in size distribution for Ranger beyond that induced by the 700-DD treatment alone, but reduced the marketable yield by 9.6 MT ha−1. In contrast to GA, the mechanism by which age-priming altered tuber size distribution in Ranger could not be explained by effects on stem number/tuber set relationships alone. Bondi, however, exhibited an even greater shift toward smaller tubers with no reduction in yield with the combined 700-DD/GA (2 mg L−1) treatment, reflecting its decreased sensitivity to GA. Moreover, the shift in tuber size distribution induced by aging Bondi seed for 700 DD was approximately equal to that observed by treating seed with 8 mg L−1 GA (optimal concentration). The reduced sensitivity of Bondi to GA was likely inherited from its paternal parent Karaka, which displays similar morphological traits, including high yield of large tubers.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9507-7
      Issue No: Vol. 93, No. 4 (2016)
       
  • Intuitive Visual Impressions (Cogs) for Identifying Clusters of Diversity
           within Potato Species
    • Authors: John Bamberg; Alfonso del Rio; Duroy A. Navarre
      Pages: 350 - 359
      Abstract: Abstract One of the basic research activities of genebanks is to partition stocks into groups that facilitate the efficient preservation and evaluation of the full range of useful phenotype diversity. We sought to test the usefulness of making intraspecific groups by replicated rapid visual intuitive impressions of coded plants by multiple uncoached observers. We invented the term “cog” (shorthand for cognate = “born together”) to indicate assumed genetic relatedness of cog members. All of the 16 populations of the wild potato species Solanum okadae in the genebank were thus examined in four separate grow-outs by up to seven genebank staff members, a total of 26 times. They were instructed to place them into two cogs defined only as big and not-big. Four populations were placed in the big cog for 70–90 % of observations, while all remaining populations but one were placed in the big cog for less than 5 % of observations. All populations were then assessed for DNA markers and various empirical traits. AFLP and SNP markers clearly distinguished the two cogs. The big cog populations were also distinguished from the others by virtue of having less foliar late blight resistance, more leaf hairiness, and lower tuber tomatine content. SNP similarity suggests one population of reputed Bolivian origin is really a mislabeled duplicate of another from Argentina. If so, the two cogs also perfectly align with country of natural origin, with big originating exclusively from Bolivia. Using S. okadae as a model, we demonstrated that rapid, simple, and inexpensive visual intuitive cogs reliably predict significant genetic and phenotypic differences. We propose testing the cog technique on other species and applying it as a new potato germplasm descriptor.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9508-6
      Issue No: Vol. 93, No. 4 (2016)
       
  • Potato Virus X (PVX) Elimination as Short and Long Term Effects of
           Hydrogen Peroxide and Salicylic Acid Is differentially Mediated by
           Oxidative Stress in Synergism with Thermotherapy
    • Authors: Miguel Aguilar-Camacho; Martha E. Mora-Herrera; Humberto A. López-Delgado
      Pages: 360 - 367
      Abstract: Abstract Short and long term effects of hydrogen peroxide (H2O2) and salicylic acid (SA) were examined in: thermotolerance, virus X (PVX)-free microplants obtained by in vitro thermotherapy, catalase activity (CAT) and H2O2 concentration. Short term effects (STE) were tested as follows: (a) nodal explants were cultivated 30 d on MS medium containing SA 10−5 or 10−6 M; and (b) nodal explants were waterlogged for 1 h in 1 or 5 mM H2O2 solution and subsequently cultured in MS for 30 d. Long term effects were tested as follows (LTE): the experimental regime was identical to STE but SA and H2O2 treated plants were subcultured for an additional 30 d period on MS. All treatments were followed by thermotherapy (32–42 C) for 35 d. Results showed SA and H2O2 induced thermotolerance during thermotherapy. The percentage of PVX-free plants obtained in H2O2 was significantly higher than in SA in STE and LTE by 3-and 4 fold respectively. CAT activity was differentially mediated by SA and H2O2.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9509-5
      Issue No: Vol. 93, No. 4 (2016)
       
  • Nutritional and Structural Response of Potato Plants to Reduced Nitrogen
           Supply in Nutrient Solution
    • Authors: Dong Chil Chang; Yong Ik Jin; Su Jeong Kim; Sung Tae Park; Young Ryul Cho; Yong Beom Lee
      Pages: 368 - 377
      Abstract: Abstract Seasonal experiments, spring studies in 2008 and 2014, and autumn studies in 2008 and 2013, were conducted to investigate the nutritional and structural response of potato leaves to reduced nitrogen (N) supply in the nutrient solution. Tissue culture plantlets of cultivars Atlantic and Superior were transplanted into a recirculating aeroponic system and grown at N concentration of 7.2 meq L−1 (6.5 meq L−1 NO3–N and 0.7 meq L−1 NH4–N). The N concentration was reduced to 3.5 meq L−1 for 4, 8, and 16 days at 30 days after transplanting (DAT), and compared with control plants which were grown under a constant concentration (7.2 meq L−1) of N. Plants that underwent reduced N brought back to normal N concentration of 7.2 meq L−1. Potato shoots grown under reduced N supply exhibited suppression of total N, calcium (Ca) and magnesium (Mg) uptake, and enhancement of phosphorus (P) uptake. The suppression of N uptake decreased shoot growth and leaf mesophyll development with inhibited chlorophyll accumulation. Photosynthesis decreased significantly with 16 days of N reduction in two seasons in 2008, but did not differ in 2013 and 2014. During spring, days to tuberization for Atlantic were shorter with the reduced N supply, whereas no difference was observed in autumn. Tuberization of Superior was delayed for two days in plants grown for 16 days with a reduced N supply. Although the number and weight of tubers harvested were significantly different in only one of the four experimental seasons, these values appeared to decline with 16 days of N reduction. The cultivar Atlantic was more susceptible to N reduction because differences in nutrient uptake, chlorophyll synthesis, tuberization, and tuber growth in response to N reduction were greater than in Superior. Response to the N reduction was greater in spring than autumn. The data indicated that careful control of N concentration is necessary to minimize possible decrease in tuberization and tuber growth, especially for the cultivar Atlantic and during the spring season.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9510-z
      Issue No: Vol. 93, No. 4 (2016)
       
  • Erratum to: Nutritional and Structural Response of Potato Plants to
           Reduced Nitrogen Supply in Nutrient Solution
    • Authors: Dong Chil Chang; Yong Ik Jin; Su Jeong Kim; Sung Tae Park; Young Ryul Cho; Yong Beom Lee
      Pages: 378 - 379
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9520-x
      Issue No: Vol. 93, No. 4 (2016)
       
  • Potato Production in Thailand
    • Authors: Piya Kittipadakul; Boonsri Jaipeng; Anthony Slater; Walter Stevenson; Shelley Jansky
      Pages: 380 - 385
      Abstract: Abstract Potato production has increased dramatically in recent years in Thailand. Consumer demand for fresh and processed potatoes has driven this trend. Most potatoes are produced in northern Thailand in either double cropping highland zones or as a single winter crop following rice in lowland regions. Major production constraints are quality seed, cultivars adapted to short season warm climates, and high disease incidence. There is a need for increased research for cultivar development, access to high quality seed and improved commercial potato production practices.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9511-y
      Issue No: Vol. 93, No. 4 (2016)
       
  • Variation in Susceptibility to Potato Psyllid, Bactericera cockerelli
           (Hemiptera: Triozidae), among Solanum verrucosum Germplasm Accessions
    • Authors: W. Rodney Cooper; John B. Bamberg
      Pages: 386 - 391
      Abstract: Abstract Potato psyllid, Bactericera cockerelli (Šulc) (Hemiptera: Triozidae), is a key pest of potato and the vector of “Candidatus Liberibacter solanacearum,” the pathogen associated with zebra chip disease. Development of potato cultivars with genetic resistance to potato psyllid would enable cost-effective control of this pest with reduced use of insecticides. To facilitate the development of resistant cultivars, the objective of our study was to screen germplasm accessions of Solanum verrucosum for resistance to potato psyllid. The susceptibility of S. verrucosum germplasm accessions to potato psyllid was highly variable in choice prescreening assays and no-choice performance assays. Compared with the susceptible potato cultivar, ‘Russet Burbank,’ several S. verrucosum populations exhibited strong resistance to potato psyllid. The S. verrucosum accession, PI 195170 was highly resistant to potato psyllid, and is a potential source of genetic resistance for the development of resistant potato cultivars.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9512-x
      Issue No: Vol. 93, No. 4 (2016)
       
  • Use of a Critical Phosphorus Dilution Curve to Improve Potato Crop
           Nutritional Management
    • Authors: Ester C. Zamuner; Jaume Lloveras; Hernán E. Echeverría
      Pages: 392 - 403
      Abstract: Abstract Plant diagnostic methods to determine P deficiencies need the definition of a critical concentration value which represents the minimum P concentration required to achieve maximum growth. The critical P concentration (Pc) has not been determined for potato. We designed a five years experiment with the objective of using the relationship between P concentrations and total dry matter (TB) yield to determine and validated the Pc, expressed as a function of TB. The Pc was described by the model: 3.919*TB -0.304 where total biomass (TB) ranged from 1 to 16 Mg ha−1. The P nutritional index (PNI), which is the ratio between the measured whole plant P concentration and Pc, was associated with the relative tuber yield measured at harvest. The results from this study support the use of PNI from 60 to 80 days after planting to determine potato crop P nutritional status.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9514-8
      Issue No: Vol. 93, No. 4 (2016)
       
  • Phosphorus Fertilizer Rate for Fresh Market Potato Cultivars Grown in
           Tropical Soil with Low Phosphorus Availability
    • Authors: Adalton M. Fernandes; Rogério P. Soratto
      Pages: 404 - 414
      Abstract: Abstract Knowledge on phosphorus (P) response of main potato cultivars is essential to rational fertilization management and maximize yield, mainly in tropical soils that usually have low P availability. An experiment was conducted to evaluate the effect of P fertilization rates (0, 125, 250, 500, and 1000 kg P2O5 ha−1) on leaf nutrient concentrations, tuber yield and size distribution, as well as applied P-use efficiency (APUE) in the potato cultivars Agata and Mondial. The results indicated that it is not necessary to evaluate the P-nutritional status and adjust P recommendations on a cultivar basis because P fertilization resulted in similar increases in the leaf P concentration of both cultivars, and the cultivars responded to the same P rate (500 kg P2O5 ha−1). However, Mondial had a higher APUE and was more responsive than Agata to the same P rate. A leaf P concentration of 2.9 g kg−1 was superior to 2.5 g kg−1 as the lower limit of the P sufficiency range for Agata and Mondial.
      PubDate: 2016-08-01
      DOI: 10.1007/s12230-016-9515-7
      Issue No: Vol. 93, No. 4 (2016)
       
  • Tuber Chemical Composition and Acrylamide Formation Potential in three
           Potato Cultivars Supplied with two Nitrogen Sources
    • Authors: J. G. Silva; A. P. Araújo; S. M. Vieira; M. G. C. França
      Abstract: Abstract Some traits of potato tubers can affect their quality, contributing to potential acrylamide formation in chips. Using three potato cultivars with contrasting dry biomass and reducing sugar contents, the effects of nitrogen source and storage conditions on tuber non-structural carbohydrate and free amino acid contents were evaluated. Color and acrylamide precursors formation were also evaluated. Cultivars presented their own characteristics for accumulation of sugars and free amino acids, the nitrogen source having only a minor effect on carbohydrates and amino acids contents. Starch mobilization and free amino acid accumulation occurred in all cultivars, but one presented the greatest sugars contents after cold storage. In general, tubers having the greatest sugar and amino acids contents also presented color alteration in chips and greatest acrylamide content. Selecting potato cultivars with lower sugars content and sensitivity to cold storage could be strategies to reduce contents of acrylamide precursors in tubers that decrease chips quality.
      PubDate: 2016-09-22
      DOI: 10.1007/s12230-016-9537-1
       
  • Relationship between Sugars and Phenylpropanoids in Tubers from Diverse
           Genotypes
    • Authors: Rajesh K Singh; Duroy A Navarre; Charles R. Brown
      Abstract: Abstract Previous studies suggested sucrose may play a regulatory role in potato phenylpropanoid metabolism via activation of MYB transcription factors, but the interaction between sucrose and phenylpropanoids has not been studied in field grown potatoes. Exogenous sucrose increased phenylpropanoids in plantlets, whereas wounding of tuber samples increased sucrose and phenylpropanoids. Tuber sugars and phenylpropanoids were measured in over 100 different potato samples representing different genotypes, developmental stages and locations. Total phenolic content ranged from 1.6 to 17.0 mg/g dry wt and sucrose concentrations ranged from 4.7 to 132 mg/g dry wt. Sucrose was the most abundant sugar, followed by glucose and fructose. Overall, a modest positive correlation was seen between sucrose and phenolic concentrations (R2 = 0.55; p < 0.01). Typically, tubers with a higher concentration of sucrose contained higher phenolic levels. When the same cultivars were grown in multiple locations, the tubers with the lowest amount of phenolics also had the lowest amount of sucrose. The higher amounts of phenolics found in immature potatoes relative to mature potatoes also correlated with higher amounts of sucrose. Tubers infected with Zebra chip disease had higher amounts of phenylpropanoids, and also higher amounts of sucrose. These data support a regulatory role for sucrose in tuber phenylpropanoid metabolism and suggest that the absolute amount of tuber sucrose is important, but also changes in tuber sucrose homeostasis.
      PubDate: 2016-09-20
      DOI: 10.1007/s12230-016-9538-0
       
  • Manipulation of Physiological Seed Age of Russet Burbank and Ranger Russet
           Potatoes – Economic Evaluation
    • Authors: Sarad Nepal; Christopher S. McIntosh; Michael K. Thornton; Nora Olsen; Phil Nolte; Paul E. Patterson
      Abstract: Abstract Physiological age of seed potatoes can impact stem number per plant and harvestable tuber number and size. Alteration in harvested tuber size has economic implications based upon market and pricing. The objective of this study was to manipulate physiological age of seed potatoes utilizing seven storage temperature regimes for two cultivars (Ranger Russet and Russet Burbank) over three different growing seasons in Idaho and to assess changes in stem number and harvested tuber size profile. Aged seed were planted in three locations in Idaho and evaluated for stem number per plant and yield. As seed storage temperature increased, seed physiologically aged, as evidenced by a rise in the number of stems per plant. This result was similar in all three locations and for both cultivars. The number of stems per plant can be used as an early season predictor of potato yield and size. Stem number per plant, the number of tubers and average tuber size were compared for each treatment and location. Economic returns were analyzed using ordinary least squares regressions. Economic impacts of physiological seed aging in terms of dollars per hectare for fresh and processed markets were mixed.
      PubDate: 2016-09-20
      DOI: 10.1007/s12230-016-9539-z
       
  • Interactive Effects of Fumigation and Fungicides on Potato Response to
           Nitrogen Rate or Timing
    • Authors: Keith A. Kelling; Walter R. Stevenson; Phillip E. Speth; R. Vaughan James
      Abstract: Abstract The availability and use of crop protectants including azoxystrobin in combination with fumigation has extended the Central Wisconsin effective growing season by 2 to 4 weeks. This study, evaluating the influence of these crop protection practices on the optimum nitrogen rate and time of application for Russet Burbank potato (Solanum tuberosum L.), was established as two 3-year field trials designed as split-split plot experiments. Both experiments used metam sodium as the main plots and fungicide treatment (chlorothalonil Zn alone or chlorothalonil Zn alternated with azoxystrobin for the first six sprays) as the first split. In-season fertilizer N rate (179, 224, 269, or 313 kg N ha−1) or in-season N timing (N split into two, three, or four applications at 269 kg N ha−1) was the second split. Not fumigating resulted in significantly higher verticillium ratings and severely repressed crop yield and tuber quality responses to both fungicide treatment and N rate. On average, fumigation increased total yield 13.6 Mg ha−1yr−1, U.S. No. 1 tubers by 9 % and U.S. No. 1 tubers >170 g by 5 % over where fumigation was not used. In 2 of the 3 years when azoxystrobin was included in the fungicide program early blight severity was reduced by about 50 %, and on fumigated areas yields were increased 4.8 Mg ha−1, whereas no yield increase was seen from this fungicide treatment on the non-fumigated plots. In these same years, fumigation increased optimum N rate by about 50 kg ha−1; however, there was no apparent interaction with fungicide treatment. Although fumigation, fungicide treatment, and time of N application each influenced tuber yield or tuber quality in some years, in the two more responsive years some interactions between these factors were statistically significant, with benefits generally only seen where plots were fumigated.
      PubDate: 2016-09-09
      DOI: 10.1007/s12230-016-9532-6
       
  • Crop Management Practices and Reduction of On-Farm Spread of Potato virus
           Y : a 5-Year Study in Commercial Potato Fields in New Brunswick, Canada
    • Authors: Tyler D. B. MacKenzie; Xianzhou Nie; Mathuresh Singh
      Abstract: Abstract In this study, on-farm within-season spread of Potato virus Y (PVY) was measured in 56 seed, processing and tablestock potato fields in New Brunswick, Canada between 2010 and 2014. These represented 13 potato varieties, managed by 16 growers employing a wide range of PVY control techniques. Many aspects of management techniques were quantified, as well local aphid abundances and climatological data. PVY spread, measured in leaves and tubers (by ELISA and RT-PCR), was tracked through the season in individually marked plants. Over the five seasons under study, on-farm PVY spread overall has declined substantially. Across all 56 fields, however, it has varied widely, from 10 fields not showing any spread during the crop season, up to as high as 76 % spread in one 2012 field. Factors correlated with increased PVY spread included seed-borne PVY inoculum planted in the field, aphid abundance early in the season, and to a lesser degree temperatures in July and over the preceding winter. Factors correlated with decreased spread included numbers of foliar mineral oil and insecticide sprays (especially of the lambda-cyhalothrin and flonicamid types), later crop planting and earlier first spraying dates. A mid-season leaf test for PVY was shown to be strongly indicative of ultimate PVY spread at harvest, and may prove a useful test in advising growers. A set of locally-relevant best management practices based on these results is discussed.
      PubDate: 2016-08-29
      DOI: 10.1007/s12230-016-9534-4
       
  • Characterization and Evaluation of Potato Genotypes ( Solanum tuberosum L
           ) for Tolerance to Drought in Uganda
    • Authors: V. E. Kesiime; G. Tusiime; I. N. Kashaija; R. Edema; P. Gibson; P. Namugga; R. Kakuhenzire
      Abstract: Abstract Potato production in Uganda is being affected by rainfall fluctuations in both timing and amount, resulting into inadequate soil moisture availability and low productivity. Also, potato production is expanding into locations at lower altitudes, where drought is more common. Therefore, drought stress mitigation measures and coping mechanisms need to be devised to face future challenges of climate change, particularly in developing countries to ensure steady supply of adequate quantities of quality food. This study thus, aimed at characterizing new potato clones from CIP (International Potato Center) for tolerance to drought under Ugandan conditions. Consequently a screen house experiment was conducted twice at Kachwekano Zonal Agricultural Research and Development Institute (KAZARDI) from October 2011 to February 2012 and April to July 2012 to evaluate and characterize eight potato genotypes; five of which were obtained from CIP’s breeding collection for drought tolerance and low altitude areas, and three locally released varieties from Uganda. These clones were tested for drought tolerance at three levels of simulated moisture deficit; 25 % field capacity, 50 % and 100 % field capacity (FC). Data were collected on leaf chlorophyll content, relative leaf water content, number of days to 50 % flowering, percent ground cover, leaf area, plant height, number of stems per plant, stem diameter, stress score, increment in plant height after imposing stress, tuber dry matter content and yield components. Of all the traits evaluated, yield and number of days to 50 % flowering contributed most to drought tolerance among the potato genotypes evaluated. There were significant (P ≤ 0.05) differences among genotypes for all evaluated traits. Results from both growth, physiological and yield parameters revealed that the new potato clones were less affected by drought stress compared to adapted varieties. Total tuber yield was 23 tons per hectare, 11.4 and 8.1 in plots at full field capacity, 50 % and 25 % moisture stressed plots respectively in the first experiment. A similar trend was obtained in the second experiment with 19 tons per hectare, 13.7 and 11.3 respectively. The new clones at highest moisture stress had significantly (P ≤ 0.05) higher yields than adapted varieties providing a promise for possible new varieties and breeding stock in extreme conditions of moisture deficit.
      PubDate: 2016-08-29
      DOI: 10.1007/s12230-016-9533-5
       
  • A Geostatistical Approach to Visualize the Diversity of Soil Inhabiting
           Bacteria and Edaphic Qualities in Potato ( Solanum tuberosum) Production
           Systems
    • Authors: N. Rosenzweig; L. Steere; B. Gerondale; W. W. Kirk
      Abstract: Abstract A study was conducted in Michigan (MI) to assess spatial patterns of soil biological and physiochemical factors related to yield in potato production. The project developed an approach to integrate techniques including: high-throughput DNA sequencing; GIS; geostatistics; traditional soil analyses; and yield data. Twenty soil samples were taken and GPS marked in the fall of 2012 from a grower’s field scheduled to be in potato production, and total genomic DNA was extracted. Parallel sequencing targeting the 16S rRNA gene was used to assess bacterial diversity. The total number of taxa identified by sequence analysis was 21, 81, 140, 300 and 814 at the level of phyla, class, order, family and genus respectively. Sequencing results and information gathered on yield at each point was used to generate multi-layer GIS-based maps.
      PubDate: 2016-08-08
      DOI: 10.1007/s12230-016-9530-8
       
  • Detection and Differentiation of Potato Virus Y Strains by Melting
           Analysis of an Oligonucleotide Virus Probe
    • Authors: N. Rotem; C. Shtein; A. Rosner; D. Levy; H. D. Rabinowitch
      Abstract: Abstract A novel simple, fast qualitative method for detection and differentiation of PVY strains in potatoes by the LightCycler technology is described. Fluorescent-labeled probe designed to contain variable degree of homology with a ‘target sequence’ of several known reference PVY strains was annealed to PCR products of these viruses followed by a graded melting analysis. The specific characteristics of the melting curves enable the detection, distinction and differentiation of each of following four known PVY strains O-FL, O-RB, N and NTN, in a single reaction obviating the need for size or nucleotide sequence analyses. In addition, it was demonstrated that virus extracts from plants infected with more than one strain can be resolved using this procedure. The melting-curves of extracts from 55 market size tubers harvested randomly from commercial fields and compared with those of the reference virus strains, revealed the presence of O-FL, O-RB and NTN strains of PVY.
      PubDate: 2016-08-08
      DOI: 10.1007/s12230-016-9531-7
       
  • The Analysis of Potato Farming Systems in Chencha, Ethiopia: Input, Output
           and Constraints
    • Authors: Waga Mazengia Dersseh; Yenenesh Tadesse Gebresilase; Rogier P. O. Schulte; Paul C. Struik
      Abstract: Abstract A household survey was conducted for mixed farming systems in Chencha, Ethiopia. Goals of the survey were to establish a baseline for the current production system, to quantify the variation in input and output, and to identify constraints hindering expansion of potato production. Descriptive statistics and principal component analysis were computed using SPSS and XLSTAT. Input and product use constraints varied over household characteristics. Using improved varieties, inorganic fertilizers, and selling products strongly and positively correlated with the households’ wealth, adoption, and education levels. Problems of cash and inadequate produce negatively correlated with wealth, adoption factors, and education levels. Access to improved varieties, training, and fertilizer were positively correlated with age, family size and gender. Land and labour shortages and pests were identified as cross-cutting constraints. Results of the analysis identify a need for a pluriform advisory model recognizing and building upon alleviation of the diversity of constraints identified in this analysis.
      PubDate: 2016-07-20
      DOI: 10.1007/s12230-016-9521-9
       
 
 
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