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  Subjects -> AGRICULTURE (Total: 778 journals)
    - AGRICULTURAL ECONOMICS (77 journals)
    - AGRICULTURE (528 journals)
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    - POULTRY AND LIVESTOCK (51 journals)

AGRICULTURE (528 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 Agronomica Sinica     Full-text available via subscription   (Followers: 5)
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: 2)
Advances in Agriculture & Botanics     Open Access   (Followers: 8)
Advances in Agronomy     Full-text available via subscription   (Followers: 12)
Advances in Life Science and Technology     Open Access   (Followers: 8)
AFBM Journal     Open Access  
Africa Development     Open Access   (Followers: 19)
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: 11)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 5)
African Journal of Sustainable Development     Full-text available via subscription   (Followers: 4)
Agra Europe     Full-text available via subscription   (Followers: 3)
Agribusiness : an International Journal     Hybrid Journal   (Followers: 7)
Agricultura Tecnica     Open Access   (Followers: 6)
Agricultura Tropica et Subtropica     Open Access   (Followers: 1)
Agricultura, Sociedad y Desarrollo     Open Access  
Agricultural Advances     Open Access   (Followers: 3)
Agricultural and Food Science     Open Access   (Followers: 14)
Agricultural Commodities     Full-text available via subscription  
Agricultural Economics     Hybrid Journal   (Followers: 43)
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: 23)
Agricultural Water Management     Hybrid Journal   (Followers: 22)
Agriculture     Open Access   (Followers: 4)
Agriculture & Food Security     Open Access   (Followers: 7)
Agriculture (Poľnohospodárstvo)     Open Access   (Followers: 1)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Food Sciences Research     Open Access  
Agriculture and Human Values     Hybrid Journal   (Followers: 12)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 43)
Agriprobe     Full-text available via subscription  
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)
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: 7)
Agrosearch     Open Access   (Followers: 1)
AI & Society     Hybrid Journal   (Followers: 4)
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: 14)
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: 1)
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: 24)
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)
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 1)
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: 7)
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   (Followers: 1)
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: 1)
Bangladesh Journal of Scientific Research     Open Access  
Bioagro     Open Access  
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 3)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 6)
Biodiversity     Hybrid Journal   (Followers: 21)
Biodiversity : Research and Conservation     Open Access   (Followers: 23)
Biological Agriculture & Horticulture : An International Journal for Sustainable Production Systems     Partially Free   (Followers: 10)
Biosystems Engineering     Hybrid Journal   (Followers: 4)
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  
Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca : Food Science and Technology     Open Access  
California Agriculture     Open Access  
Cambridge Journal of Economics     Hybrid Journal   (Followers: 39)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 17)
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  
Ciencia y Agricultura     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: 9)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 2)
Contributions to Tobacco Research     Open Access   (Followers: 1)
Corps et culture     Open Access   (Followers: 5)
Cuadernos de Desarrollo Rural     Open Access  
Cultivos Tropicales     Open Access  
Cultural Geographies     Hybrid Journal   (Followers: 16)
Cultural Sociology     Hybrid Journal   (Followers: 27)
Cultural Studies - Critical Methodologies     Hybrid Journal   (Followers: 14)
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: 5)
Culture, Health & Sexuality: An International Journal for Research, Intervention and Care     Hybrid Journal   (Followers: 18)
Current Life Sciences     Open Access   (Followers: 2)
Current Research in Dairy Sciences     Open Access   (Followers: 5)
Dairy Mail Africa : Publication for the Dairy Industry in Africa     Full-text available via subscription   (Followers: 2)
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: 113)
Economic Affairs     Hybrid Journal   (Followers: 6)
Economic and Industrial Democracy     Hybrid Journal   (Followers: 6)
Economic Bulletin     Hybrid Journal   (Followers: 4)
Economic Policy     Hybrid Journal   (Followers: 22)
Economic Record     Hybrid Journal   (Followers: 5)
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  
Environment and Development Economics     Hybrid Journal   (Followers: 26)
Eppo Bulletin     Hybrid Journal   (Followers: 2)
Ethology     Hybrid Journal   (Followers: 6)
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: 63)
European Review of Agricultural Economics     Hybrid Journal   (Followers: 10)
EvoDevo     Open Access   (Followers: 1)
Extensão Rural     Open Access  
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: 1)
Food New Zealand     Full-text available via subscription   (Followers: 3)
Food Policy     Hybrid Journal   (Followers: 27)
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: 1)
Geoderma     Hybrid Journal   (Followers: 7)
Ghana Journal of Agricultural Science     Full-text available via subscription   (Followers: 2)
Global Approaches to Extension Practice : A Journal of Agricultural Extension     Full-text available via subscription  
Global Economic Review     Hybrid Journal   (Followers: 6)

        1 2 3 | Last

Journal Cover American Journal of Potato Research
  [SJR: 0.519]   [H-I: 29]   [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  [2281 journals]
  • Economic Comparison of Conventional and Conservation Management Practices
           for Irrigated Potato Production in Southern Alberta
    • Abstract: Abstract Conventional (CONV) potato (Solanum tuberosum L.) production in Alberta has relied on high levels of soil disturbance which may result in long-term degradation of soil resources. A 12-yr (2000–2011) study was conducted to address issues with the CONV system and to evaluate the effects of conservation (CONS) practices on the economics of irrigated potato production. Potato was grown in 3- to 6-yr rotations which included dry bean (Phaseolus vulgaris L.), sugar beet (Beta vulgaris L.), soft wheat (Triticum aestivum L.), oat (Avena sativa L.), and timothy (Phleum pratense L.). CONS included reduced tillage, cover crops, compost addition, and solid-seeded bean. Averaged over 12-yr, potato yields for 4-yr CONV rotations (potato–wheat–beet–bean) were lower than those for CONS systems. However, the decreased costs associated with not using compost in 4-yr CONV offset the losses in yield, thereby resulting in an overall net income higher than that of CONS systems.
      PubDate: 2016-05-13
  • Water Regimes and Humic Acid Application Influences Potato Growth, Yield,
           Tuber Quality and Water Use Efficiency
    • Abstract: Abstract This study assessed effects of irrigation water regimes and humic acid (HA) application on vegetative growth, yield, tuber quality and water use efficiency (WUE) of potato. Five irrigation treatments were applied at three developmental stages; (WR1) control (100 % crop evapotranspiration, 100 % ETc) at all plant growth, (WR2) 75 % ETc at all stages, (WR3) 75 % ETc at stage S1 (vegetative growth), (WR4) 75 % ETc at stage S2 (tuber initiation), and (WR5) 75 % ETc at stage S3 (tuber bulking). HA was applied at a rate of 1.5 g L−1 30 day after seed pieces planting. Plants experiencing water stress at S1 were shorter with fewer branches and lower fresh and dry vine weights. Water stress imposed at S2 significantly reduced tuber number, size, and yield. HA application increased vegetative growth, tuber weight, yield, WUE, and tuber quality (specific gravity and starch content). Thus, applying 1.5 g L−1 HA during vegetative growth and a 75 % ET water regime at S3 can increase potato production and tuber quality while reducing water use.
      PubDate: 2016-05-13
  • Accumulation of Genetic Diversity in the US Potato Genebank
    • Abstract: Abstract Efficient assessment of genetic diversity in a potato genebank includes understanding how much of the available genetic diversity has been captured in the genebank (from the wild or from other ex situ sources). We used existing datasets from three of the genebank’s 93 species to model the increase of diversity over time, as measured by the addition of AFLP bands. DNA samples of a total of 411 populations of S. microdontum (mcd), S. jamesii (jam), and S. fendleri (fen) were analyzed. Assuming the first (oldest) populations as the baseline, the number of AFLP markers have increased by 128 % (mcd), 154 % (jam) and 111 % (fen) with addition of populations to the genebank. The pattern of actual observed chronological gain in diversity was similar to that which one would expect from random additions of populations except for fen, suggesting recent additions were somewhat redundant. All species continued to accumulate new loci at least up to 100 populations, jam particularly so. Much effort has been made over many years to thoroughly collect jam, so its 125 populations could serve as a model for the number of samples one might practically hope to acquire for the average species. Since 100 jam populations captured 95 % of its polymorphic loci, 100 populations might be set as an optimal benchmark. The average species in the genebank now has about 54 populations, so the size of the genebank would need to roughly double its capacity to optimize diversity according to the jam model. That would be a challenge, but probably not as limiting as the great time and resources needed to collect the germplasm.
      PubDate: 2016-05-13
  • Erratum to: Nutritional and Structural Response of Potato Plants to
           Reduced Nitrogen Supply in Nutrient Solution
    • PubDate: 2016-04-29
  • Potato Production in Thailand
    • 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: 2016-04-29
  • Intuitive Visual Impressions (Cogs) for Identifying Clusters of Diversity
           within Potato Species
    • 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: 2016-04-29
  • The Potato Association of America Honorary Life Members, 2015
    • PubDate: 2016-04-21
  • Abstracts of Papers Presented at the 99th Annual Meeting of the Potato
           Association of America Portland, Maine, USA July 19–23, 2015
    • PubDate: 2016-04-21
  • The Potato Association of America 99th Annual Meeting Portland, Maine, USA
           July 19–23, 2015
    • PubDate: 2016-04-21
  • Salt Accumulation and Potato Tuber Yield Response to Historical Dairy
           Manure Applications in South-Central Idaho
    • Abstract: Abstract Dairy manure applications are common practice in southern Idaho. Questions have arisen regarding the salt accumulations commonly associated with dairy manure applications on salt-sensitive crops like potatoes. The objective of this 2-year study was to evaluate the impact of dairy manure, dairy compost, dairy lagoon water and fertilizer application on salt accumulation and tuber yields in south-central Idaho based on grower-reported nutrient applications and yields. Soil samples and grower-reported tuber yield information were collected midseason (during time period of July 1st-July 30th) from 84 cooperator potato fields in south-central Idaho in both 2009 and 2010. Soil samples were collected to a 30 cm depth and analyzed for soil electrical conductivity (EC), soluble K, Na, Ca, Mg, and pH. Information on manure application, cultural management practices, and total tuber yield was collected for each field. Average reported application rates (wet basis) of these amendments were: 128 Mg ha−1 dairy manure (28 fields), 29 Mg ha−1 dairy compost (11 fields), 415,000 l ha−1 dairy lagoon water (9 fields), or no manure applied (33 fields) over the 4 year period prior to the study. Mean soil soluble K for dairy manure (1.6 mmolc L−1) and dairy lagoon water fields (1.4 mmolc L−1) were significantly greater than dairy compost (0.6 mmolc L−1) or fertilizer fields (0.4 mmolc L−1). Manure application history had no significant treatment effect on soil electrical conductivity (EC), sodium adsorption ratio (SAR), soluble Na, Ca, or K, soil pH, or grower-reported total tuber yield. These overall findings suggest that current dairy manure, compost, and lagoon water application practices to potato production systems in south-central Idaho are not significantly influencing tuber yield or soil salt accumulations. However, significant soluble K accumulations in the soil suggest that dairy manure and dairy lagoon water applications should still be monitored to avoid potential salt accumulations and yield losses.
      PubDate: 2016-04-01
  • Mountain Gem Russet: a Potato Variety with High Early and Full Season
           Yield Potential and Excellent Fresh Market and Early Processing
    • Abstract: Abstract Mountain Gem Russet is a potato variety notable for having both high early and full-season yields of oblong-long, medium-russeted tubers with higher protein content than those of standard potato varieties. Mountain Gem Russet has greater resistance to soft rot, tuber late blight, growth cracks and second growth than Russet Burbank. Mountain Gem Russet produced greater total and U.S. No. 1 yields than Ranger Russet and Russet Norkotah in early-season trials conducted in Idaho, Oregon and Washington over a 3 year period. In full-season trials conducted in five western states over a 4 year period, average total and U.S. No. 1 yields for Mountain Gem Russet were almost always higher than Ranger Russet and Russet Burbank, with specific gravities averaging between these two standard cultivars. It maintains acceptable reducing sugar concentrations and fry quality when stored at 8.9 °C and has displayed a high level of fry color uniformity from tuber stem to bud end providing good potential for early processing. High fresh merit ratings and taste panel sensory scores comparable to Russet Burbank indicate good fresh market potential for Mountain Gem Russet. It was released in 2015 by the USDA-ARS and the Agricultural Experiment Stations of Idaho, Oregon, and Washington, and is a product of the Pacific Northwest Potato Variety (Tri-State) Development Program.
      PubDate: 2016-04-01
  • Genome-wide Analysis of the Snakin/ GASA Gene Family in Solanum tuberosum
           cv. Kennebec
    • Abstract: Abstract Snakin/GASA proteins have been involved in different aspects of plant growth and development although their exact role is still intriguing. All of them maintain 12 cysteines of the C-terminus in highly conserved positions that are responsible for their structure and are essential for their biochemical activity as antioxidants. Two members were isolated from Solanum tuberosum to date (Snakin-1 and Snakin-2) and were shown to have antimicrobial activity. We have recently demonstrated that Snakin-1 has additional roles in plant growth and development. We carried out a genome-wide search for new Snakin/GASA family members in potato. 16 Snakin/GASA genes were isolated, sequenced and characterized. Interestingly, we found in Solanum tuberosum subsp. tuberosum cv. Kennebec that Snakin-1, Snakin-2 and Snakin-3 expression is affected by bacterial and/or fungal inoculation. These results strengthen the participation of Snakin-1 and Snakin-2 genes in biotic stress tolerance and suggest that Snakin-3 is also involved in plant defense. The data presented here could be a good starting point for more focused and deep investigations regarding the biological functions of potato Snakin/GASA genes during plant development and in response to environmental stress.
      PubDate: 2016-04-01
  • Yield and Physiological Response of Potatoes Indicate Different Strategies
           to Cope with Drought Stress and Nitrogen Fertilization
    • Abstract: Abstract Access to Water and Nitrogen (N) are key challenges in potato crop management that could be optimized through understanding related agronomic and physiological traits. The responses to water deficit and two levels of nitrogen (0 and 200 kg N.ha-1) were assessed here for agronomic and physiological traits for potato genotypes UNICA, Achirana-INTA, and CIP397077.16, chosen for their short vegetative period (90–-110 days) and tolerance to water deficit. Nitrogen Use Efficiency (NUE) was greatly reduced in all genotypes under drought, even dropping to nearly zero. Despite this, the tuber yield and total biomass reduction of around 50 % for all genotypes could be alleviated with N application. Normalized Difference Vegetation Index (NDVI), chlorophyll content (SPAD), and Canopy cover (CC) were found to be good indicators for predicting nitrogen deficits and detecting early stress by drought. Overall, each genotype had different strategies to manage N and cope with drought stress. UNICA was the most efficient genotype at using the N present in the soil and tolerating drought stress, while Achirana-INTA was most affected by drought in terms of NUE. Based on the results, it is suggested that maximum fertilizer use efficiency can be obtained with low N rates applied under well-watered conditions. Improved NUE and a greater understanding of the physiological response of crops to drought stress and N fertilization will help to reduce fertilizer use, lessening the effects of water contamination and improving input efficiency.
      PubDate: 2016-03-25
  • Use of a Critical Phosphorus Dilution Curve to Improve Potato Crop
           Nutritional Management
    • 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: 2016-03-22
  • Sequence-Specific Nucleases for Genetic Improvement of Potato
    • 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: 2016-03-16
  • Phosphorus Fertilizer Rate for Fresh Market Potato Cultivars Grown in
           Tropical Soil with Low Phosphorus Availability
    • 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: 2016-03-16
  • Variation in Susceptibility to Potato Psyllid, Bactericera cockerelli
           (Hemiptera: Triozidae), among Solanum verrucosum Germplasm Accessions
    • 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: 2016-03-09
  • Nutritional and Structural Response of Potato Plants to Reduced Nitrogen
           Supply in Nutrient Solution
    • 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: 2016-03-09
  • 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
    • 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: 2016-03-04
  • Targhee Russet: A High Yielding, Dual Purpose Potato Variety with High
           Protein and Vitamin C Content and Resistance to Tuber Soft Rot
    • Abstract: Abstract Targhee Russet is a darker-skinned russet potato variety that has shown higher total and marketable yields than Russet Burbank in most yield trials conducted in the western United States. A major strength of Targhee Russet is resistance to tuber soft rot, and it also has moderate resistance to common scab, Verticillium wilt, and net necrosis associated with Potato leafroll virus. Targhee Russet also has exhibited resistance to hollow heart and blackspot bruise. Analyses have shown Targhee Russet to have significantly higher tuber protein and Vitamin C content than Russet Burbank and Ranger Russet. It produces lighter colored fries out of storage than standard processing varieties, indicating its high potential for the production of premium quality frozen and fresh-cut fries. High merit scores for fresh use are also indicative of it having excellent potential as a dual-purpose russet variety, suitable for both processing and fresh-pack operations.
      PubDate: 2016-02-23
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