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  Subjects -> AGRICULTURE (Total: 688 journals)
    - AGRICULTURAL ECONOMICS (73 journals)
    - AGRICULTURE (462 journals)
    - CROP PRODUCTION AND SOIL (90 journals)
    - DAIRYING AND DAIRY PRODUCTS (25 journals)
    - POULTRY AND LIVESTOCK (38 journals)

AGRICULTURE (462 journals)                  1 2 3 4 5 | Last

Aceh International Journal of Science and Technology     Open Access  
Acta agriculturae Slovenica     Open Access   (Followers: 5)
Acta Agrobotanica     Open Access   (Followers: 3)
Acta Agronomica Hungarica     Full-text available via subscription   (Followers: 1)
Acta Agronomica Sinica     Full-text available via subscription   (Followers: 6)
Acta Scientiarum. Animal Sciences     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access   (Followers: 1)
Acta Technologica Agriculturae     Open Access   (Followers: 3)
Advances in Agriculture & Botanics     Open Access   (Followers: 10)
Advances in Agriculture, Sciences and Engineering Research     Open Access   (Followers: 12)
Advances in Agronomy     Full-text available via subscription   (Followers: 11)
Advances in Life Science and Technology     Open Access   (Followers: 6)
AFBM Journal     Open Access  
Africa Development     Open Access   (Followers: 8)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 8)
African Journal of Agricultural Research     Open Access   (Followers: 3)
African Journal of Food Science     Open Access   (Followers: 4)
African Journal of Food, Agriculture, Nutrition and Development     Open Access   (Followers: 6)
African Journal of Horticultural Science     Open Access   (Followers: 2)
African Journal of Range and Forage Science     Hybrid Journal   (Followers: 6)
African Journal of Sustainable Development     Full-text available via subscription   (Followers: 5)
Agribusiness : an International Journal     Hybrid Journal   (Followers: 5)
Agricultura Tecnica     Open Access   (Followers: 6)
Agricultura Tropica et Subtropica     Open Access   (Followers: 2)
Agricultural Advances     Open Access   (Followers: 4)
Agricultural and Food Science     Open Access   (Followers: 19)
Agricultural Economics     Hybrid Journal   (Followers: 46)
Agricultural History     Full-text available via subscription   (Followers: 235)
Agricultural Research     Hybrid Journal   (Followers: 5)
Agricultural Science     Full-text available via subscription   (Followers: 6)
Agricultural Science     Open Access  
Agricultural Sciences     Open Access   (Followers: 8)
Agricultural Sciences in China     Full-text available via subscription   (Followers: 4)
Agricultural Systems     Hybrid Journal   (Followers: 21)
Agricultural Water Management     Hybrid Journal   (Followers: 16)
Agriculture     Open Access   (Followers: 5)
Agriculture & Food Security     Open Access   (Followers: 12)
Agriculture (Poľnohospodárstvo)     Open Access   (Followers: 1)
Agriculture and Agricultural Science Procedia     Full-text available via subscription   (Followers: 1)
Agriculture and Human Values     Hybrid Journal   (Followers: 11)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 32)
Agriprobe     Full-text available via subscription  
Agrivita : Journal of Agricultural Science     Open Access   (Followers: 4)
Agro-Science     Full-text available via subscription  
Agroalimentaria     Open Access   (Followers: 1)
Agrociencia     Open Access   (Followers: 2)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agronomía Colombiana     Open Access   (Followers: 1)
Agronomía Costarricense     Open Access   (Followers: 2)
Agronomía Mesoamericana     Open Access   (Followers: 1)
Agronomie Africaine     Full-text available via subscription  
Agronomy     Open Access   (Followers: 8)
Agrosearch     Open Access  
AI & Society     Hybrid Journal   (Followers: 2)
Alinteri Zirai Bilimler Dergisi : Alinteri Journal of Agricultural Sciences     Open Access  
Ambiência     Open Access  
Ambiente & Agua : An Interdisciplinary Journal of Applied Science     Open Access   (Followers: 1)
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 9)
American Journal of Botany     Full-text available via subscription   (Followers: 14)
American Journal of Economics and Sociology     Hybrid Journal   (Followers: 21)
American Journal of Potato Research     Hybrid Journal   (Followers: 2)
American Journal of Rural Development     Open Access   (Followers: 1)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Annales UMCS, Agricultura     Open Access  
Annales UMCS, Horticultura     Full-text available via subscription  
Annals of Agricultural and Environmental Medicine     Open Access   (Followers: 1)
Annals of Agricultural Sciences     Open Access   (Followers: 1)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 10)
APCBEE Procedia     Partially Free   (Followers: 2)
Applied Economics Letters     Hybrid Journal   (Followers: 22)
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: 2)
Arquivos do Instituto Biológico     Open Access  
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 1)
Asian Economic Papers     Hybrid Journal   (Followers: 3)
Asian Journal of Agricultural Research     Open Access   (Followers: 4)
Asian Journal of Plant Sciences     Open Access   (Followers: 2)
Australian Cottongrower, The     Full-text available via subscription   (Followers: 1)
Australian Economic Papers     Hybrid Journal   (Followers: 5)
Australian Forest Grower     Full-text available via subscription   (Followers: 2)
Australian Forestry     Full-text available via subscription   (Followers: 4)
Australian Grain     Full-text available via subscription   (Followers: 4)
Australian Holstein Journal     Full-text available via subscription  
Australian Journal of Agricultural and Resource Economics     Hybrid Journal   (Followers: 5)
Australian Journal of Agricultural Engineering     Open Access  
Australian Sugarcane     Full-text available via subscription  
Avances en Investigacion Agropecuaria     Open Access   (Followers: 1)
Bangladesh Journal of Agricultural Research     Open Access   (Followers: 2)
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Berkala Ilmiah Pertanian     Open Access   (Followers: 1)
Bioagro     Open Access   (Followers: 1)
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 5)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 5)
Biodiversity     Hybrid Journal   (Followers: 21)
Biodiversity : Research and Conservation     Open Access   (Followers: 20)
Biological Agriculture & Horticulture : An International Journal for Sustainable Production Systems     Partially Free   (Followers: 13)
Biosystems Engineering     Hybrid Journal   (Followers: 1)
Biotemas     Open Access  
Bragantia     Open Access   (Followers: 2)

        1 2 3 4 5 | Last

Journal Cover American Journal of Potato Research
   [4 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  [2210 journals]   [SJR: 0.639]   [H-I: 26]
  • Low-Cost Potato Tissue Culture with Microwave and Bleach Media Preparation
           and Sterilization
    • Abstract: Labor and equipment costs are the main expenses in potato micropropagation. To determine if we could reduce costs associated with media sterilization, a disinfectant, sodium hypochlorite (NaOCl), in combination with microwave heating, were assayed as media sterilants. Incorporating a common 5 % NaOCl household beach at a concentration of 9 ppm (active chlorine) in media sterilized with an autoclave or microwave oven controlled microorganism growth and maintained plantlet growth performance. Non-sterile 473 ml (16 oz.) clear deli containers were selected as an inexpensive replacement for traditional culture vessels and were effectively sterilized with a 50 ppm (active chlorine) NaOCl solution. Reuse of the non-sterile clear deli containers and alternate media water sources were also tested but this decreased plantlet growth performance. Comparison of a controlled growth chamber and ambient laboratory conditions was also investigated. Microorganism growth was significantly less in a controlled growth chamber (5 %) as compared to uncontrolled conditions (26–36 %).
      PubDate: 2014-12-06
       
  • Field Assessment of AtCBF1 Transgenic Potato Lines ( Solanum tuberosum )
           for Drought Tolerance
    • Abstract: Drought prone areas have been increasing around the world and it is expected that these areas will continue to expand and become more severe due to climate change. Increasing the drought stress tolerance of cultivated potato (Solanum tuberosum) could aid in feeding the growing global population. The Arabidopsis CBF1 gene (AtCBF1), which has been shown to increase drought tolerance in other plants, was transformed into a cultivated potato line under the control of the stress inducible promoter COR15a. The expression of the AtCBF1 transgene was verified by RT-PCR and the transformed lines were evaluated in field trials to assess agronomic performance under sub-optimal water management. Despite expression of the AtCBF1 gene, none of the transgenic lines out-performed the control cultivar under drought-stressed conditions. Abiotic stress responsive genes from cultivated potato and wild related species may yield more promising results thus CBF1 genes from S. tuberosum and S. commersonii will be transformed into the potato cultivar Desiree and will be field tested for drought tolerance.
      PubDate: 2014-12-06
       
  • Soil Phosphorus Increases Dry Matter and Nutrient Accumulation and
           Allocation in Potato Cultivars
    • Abstract: Understanding the influence of P in the pattern of production and partitioning of dry matter (DM) and nutrients to the tubers of potato cultivars is critical for development of rational fertilization strategies to optimize tuber yield. The objective of this study was to evaluate the effect of soil P availability (Low P: 10 mg dm−3 and High P: 111 mg dm−3) in the leaf nutrients concentration, nutrients and DM accumulation and allocation to tubers of five potato cultivars (Agata, Asterix, Atlantic, Markies, and Mondial). The experiment was conducted under greenhouse conditions in pots containing 35 L of a Typic Acrortox soil. High P availability in the soil increased P concentrations in all plant organs, uptake of P and Cu, and DM production of all potato cultivars. The cultivars showed differences in the harvest index (HI) and uptake and allocation of N, K, Ca, Mg, S, Fe, Mn, and Zn to the tubers in response to P supply. Even with higher whole plant DM production and HI under high P availability in the soil, some of the cultivars did not increase the uptake and proportion allocated to the tubers of some nutrients as a response to the high P supply. This highly controlled greenhouse experiment was able to reveal cultivar differences in DM, HI, and nutrient accumulation influenced by P, a first step toward future studies exploiting these differences in the field production environment.
      PubDate: 2014-12-06
       
  • Effect of Genotype and Storage on Glycoalkaloid and Acrylamide Content and
           Sensory Attributes of Potato Chips
    • Abstract: Potato chips are the most popular snack foods consumed in Western countries. Potato chips contain beneficial bioactive compounds such as resistant starch, polyphenols etc. along with naturally occurring glycoalkaloids (GA) and processing induced acrylamide (AL). Information on the effect of genotype and storage on both GA and AL are limited. In this study the effect of cultivar and storage on both GA and AL content in potato chips was evaluated using four potato cultivars. In addition, reducing sugars and sensory attributes were measured in response to storage time and cultivar. Potato chips made from fresh and stored tubers were analyzed for total GA and AL using High Performance Liquid Chromatography and Ultra Performance Liquid Chromatography, respectively. Raw potatoes were analyzed for reducing sugars using a spectrophotometer. Sensory attributes of potato chips were assessed using 114 untrained panelists. The effect of storage on GA and AL content is cultivar dependent. Purple-fleshed cultivars were more susceptible to storage induced increase in AL content. Storage of potatoes at low temperature (4 °C) resulted in a significant increase in GA, AL and reducing sugar content after 90 days. Positive correlations were observed for the overall acceptability, texture, taste, ranking and GA/AL content, emphasizing the positive role of GA/AL on sensory qualities. These results indicate that an increase in GA and AL content with storage is dependent on cultivar. Thus, it is critical to select cultivars and optimize the storage conditions to lower GA/AL content in the potato chips, while retaining the sensory attributes and health-benefiting compounds.
      PubDate: 2014-12-01
       
  • Identification and Selection for Tuber Calcium, Internal Quality and
           Pitted Scab in Segregating ‘Atlantic’ x ‘Superior’
           Reciprocal Tetraploid Populations
    • Abstract: Developing chipping cultivars with improved tuber quality and disease resistance is a major interest for breeders and the potato industry. A popular chipping cultivar ‘Atlantic’, is desired for its high yield and gravity. However, this cultivar suffers from poor internal tuber quality and high scab susceptibility. On the contrary, cultivar ‘Superior’ is known to have excellent tuber internal quality and moderately scab resistance. In addition, this cultivar is known to have high tuber calcium as compared to ‘Atlantic’. The present study intended to generate populations that can be suitable for the genetic study of tuber calcium, internal quality, common scab, and other commercially important traits such as yield, specific gravity and chip quality at the tetraploid level. Two populations obtained by reciprocally crossing the cultivars ‘Atlantic’ and ‘Superior’ were evaluated during 2009 to 2012 at Hancock, Wisconsin. Significant genotype effects and moderately low to high broad-sense heritabilities were identified for all traits evaluated indicating that the observed phenotypic variation has an important genetic component. In addition, the parents differed significantly for all traits across trials, and most genotypes performed in between the two parents but some genotypes were more extreme than the parents. Furthermore, evidence of reciprocal effects was found for some traits. In addition to learning about the genetics of these important traits we were able to identify some genotypes that combined the commercially desired traits of the two cultivars.
      PubDate: 2014-12-01
       
  • A Sampling Plan for Liriomyza huidobrensis (Diptera: Agromyzidae) on a
           Potato ( Solanum tuberosum ) Plantation
    • Abstract: No sampling plans specifically developed for mines associated with the pest Liriomyza huidobrensis in potato fields have been published to date. Thus, the objectives of this study were to determine the sampling unit and to establish the number of samples needed for the application of this study’s sampling plan. For this purpose, we evaluated 16 commercial fields of the potato cultivar Agata (24.5 ha). We evaluated the number of mines located in the apical, middle, and basal canopy-sections of plants. Higher mine densities were found in the leaves in the middle and basal section of plants than in the apical section. The middle canopy-section was best suited for sampling the mines. The result showed that the negative binomial distribution fit the mine density of L. huidobrensis. Fifteen samples/24.5 ha was determined to be appropriate for use in conventional sampling. The cost for sampling was US $ 5.32 per ha. The cost of performing the sampling was significantly lower than the cost of insecticide application.
      PubDate: 2014-12-01
       
  • Clopyralid and Dicamba Residue Impacts on Potatoes and Weeds
    • Abstract: Clopyralid and dicamba are used in Alaska to control certain invasive and agricultural weed species; however they may have an extended soil half-life in interior Alaska resulting in carry-over injury in potatoes. Field studies at experiment stations in Delta Junction, Fairbanks, and Palmer, Alaska were established to determine the dose–response of weeds and above and below ground potato growth to soil-applied clopyralid or dicamba (0, 35, 70, 140, 280, and 560 g ae ha−1). Both Norwegian cinquefoil (Potentilla norvegica) and narrowleaf hawksbeard (Crepis tectorum) were susceptible to clopyralid with over 90 % control in Delta Junction; whereas only flixweed (Descurainia sophia) was partially controlled (70 %) with dicamba. In Palmer narrowleaf hawksbeard was controlled (87 %) with clopyralid. At Delta Junction and Fairbanks, clopyralid applied at140 g ae ha−1 injured potatoes greater than 25 %, whereas at Palmer visual injury was greater than 25 % at 70 g ae ha−1. Above ground dicamba injury was greater than 25 % at 140, 70, and 35 g ae ha−1 at Delta Junction, Fairbanks and Palmer, respectively. Potato tuber production was reduced by clopyralid at rates of 35 and 140 g ae ha−1 at Delta Junction and Palmer, respectively. At Delta Junction, dicamba did not reduce potato tuber production, however in Palmer, dicamba rates at 70 g ae ha−1 and greater reduced potato tuber production more than 50 %. Sub-samples of potato tubers from Delta Junction and Palmer were grown out to determine if clopyralid and dicamba content in tubers would reduce subsequent growth. Dicamba at rates of 140 g ae ha−1 or greater injured plants grown from daughter tubers and reduced shoot height, but had no effect on the number of emerged shoots. Clopyralid at all rates injured plants that emerged from daughter tubers and injury increased with increasing rate. At Palmer, clopyralid in daughter tubers rates at 140 g ae ha−1 or greater reduced shoot height and at 280 g ae ha−1 or greater reduced shoot number. At Delta, clopyralid in daughter tubers reduced shoot height at 280 and 560 g ae ha−1, but had no effect on shoot number.
      PubDate: 2014-12-01
       
  • Differential Accumulation and Degradation Of Anthocyanins In Red Norland
           Periderm is Dependent On Soil Type And Tuber Storage Duration
    • Abstract: To determine how soil type, 2,4-dichlorophenoxyacetic acid (2,4-D) treatment, and storage affects color and anthocyanin accumulation of Red Norland potatoes, tubers were grown in sand or peat, with or without 2,4-D treatment, and measured at vine kill, harvest or after storage. Tubers grown in sand were less red and accumulated fewer anthocyanins than tubers grown in peat. 2,4-D treatment increased redness regardless of soil type. Redness loss varied greatly among tubers with storage. Tubers that lost color with storage had a two-fold reduction in anthocyanins, and a two-fold increase in benzoic and cinnamic acids compared to harvest, indicating chemical degradation of anthocyanidins via B-ring cleavage and autoxidation. Sand-grown potatoes did not exhibit greater cinnamic acids compared to peat-grown potatoes, suggesting that their color differences were due more to differences in biosynthesis than degradation during skin set. To improve Red Norland tuber color, research should focus on increasing biosynthesis of anthocyanins.
      PubDate: 2014-12-01
       
  • Economic Impact of Zebra Chip Control Costs on Grower Returns in Seven US
           States
    • Abstract: Zebra Chip (ZC) disease exposes growers to the risk of large economic losses. Enterprise budgets are developed to evaluate how the competitive position of eight major US potato producing regions could be impacted by ZC infestations. When using three year (2010–2012) average marketing year prices for “all potatoes” and three year average (2010–2012) yields obtained from USDA-NASS, results highlight the inability of Pacific Northwest growers to sustain a profit if they adopt a routine insecticide program for ZC protection that begins at plant emergence. The uncertain threat of psyllid control costs are also considered within the context of processor contract price negotiations.
      PubDate: 2014-12-01
       
  • Production of Hybrids Between the 2EBN Bridge Species Solanum verrucosum
           and 1EBN diploid Potato Species
    • Abstract: The potato crop has diploid wild relatives in the primitive 1EBN crossability group that have a wealth of desirable traits, but are currently difficult to access through conventional crossing. The objective of this study was to develop an efficient technique for using 1EBN species in breeding by crossing to 2EBN bridge species S. verrucosum. Success was obtained with several 1EBN diploid species: S. bulbocastanum, S. pinnatisectum, S. polyadenium, S. commersonii and S. circaeifolium. Use of 2x(2EBN) S. verrucosum as a receptive female avoided prezygotic interspecific incompatibility, and double “rescue” pollination was done using haploid-inducing clone, S. phureja IvP35 to minimize postzygotic failure due to abortion of berries with few or small seeds. In total, 4,646 hybrid seeds were obtained in crosses between S. verrucosum and the 1EBN species. Rescue pollination particularly improved seeds per pollination for S. pinnatisectum hybrids. The hybrid seeds were normal in appearance and had high germination (47–88 %). They produced plants with the distinctive phenotypic characteristics and molecular markers specific to their 1EBN parents. Hybrids had poor male fertility, but crossed easily as females to diploid S. tuberosum at an average of 38 seeds per pollination.
      PubDate: 2014-12-01
       
  • Stability and Broad-Sense Heritability of Mineral Content in Potato:
           Copper and Sulfur
    • Abstract: Sulfur and copper are important for human health. Sulfur deficiency is rare, but may occur in the elderly. However, a large percentage of the U.S. population is deficient in copper. The purpose of this study was to determine the range of values for sulfur and copper available in advanced potato germplasm and varieties and estimate how much genetic variation exists for these two elements. Potato breeding lines and varieties in three multisite trials were evaluated for copper and sulfur content by wet ashing and Inductively Coupled Argon Plasma Emission Spectrophotometer analysis. Stability and broad-sense heritability were determined. Among genotypes, copper content ranged from 2.0 to 4.5 ug-g−1 DW. This was a 2.25-fold difference. In these three trials, environment was never significant, while genotype by environment interactions were always significant. Genotype was significant in two of the regional trials. Broad-sense heritabilities were estimated to be 0.0, 0.93 and 0.51 for the Tri-State, Western Regional Russet and Western Regional Red/Specialty trials, respectively. Among genotypes, sulfur content ranged from 991 to 1488 ug-g−1 DW. The highest value was 50 % higher than the lowest. In these three trials, environment was never significant, while genotype x environment interactions were always significant. Genotype was significant in two of the regional trials. Broad-sense heritabilities were estimated to be 0.53, 0.68 and 0.88, for Tri-State, Western Regional Russet, and Western Regional Red/Specialty trials, respectively. For both sulfur and copper, selection in the Western Regional Russet and Western Regional Red/Specialty trials is likely to lead to an increase in content. Selection for sulfur in the Tri-State would result in a gain as well. These results suggest that genetic improvements could be made to potato to enhance the concentrations of these minerals.
      PubDate: 2014-12-01
       
  • Effect of Potato Virus S Infection on Late Blight Resistance in Potato
    • Abstract: Late blight, caused by Phytophthora infestans , is a destructive disease of potato. Defender is the only cultivar in the U.S. with foliar and tuber resistance to this disease. However, this cultivar exhibits susceptibility to infection by Potato virus S (PVS) and severe symptoms appeared on leaves after infection with PVS. PVS is widespread in potato fields in the U.S. To investigate potential interactions between P. infestans and PVS, detached leaves of Defender and Ranger Russet (susceptible to late blight), that were either PVS-infected or non-infected, were inoculated with P. infestans BF-05. The amount of sporulation and the extent of lesion expansion on inoculated leaves were measured to estimate late blight severity. When inoculated with P. infestans only, as expected, Defender exhibited discrete, relatively small, dark purple to black hypersensitive reaction-like spots and on an average had twenty times fewer sporangia compared to Ranger Russet. However, in Defender plants infected with PVS, lesion expansion and sporulation increased significantly compared to PVS-free Defender. The increased severity of late blight in PVS-infected Defender suggests that PVS negatively impacts late blight resistance in this cultivar. This study demonstrates that late blight resistance in cultivars to be released should be screened for PVS susceptibility.
      PubDate: 2014-12-01
       
  • Efficacy of Mineral Oil-Insecticide Mixtures for Protection of Potato
           Tubers Against PVY and PVM
    • Abstract: The impact of a dozen mixtures of the most commonly applied aphicides: Mospilan 20 SP (acetamiprid), Pirimor 500 (pirimicarb) and Karate Zeon 050 CS (lambda-cyhalothrin), combined with the mineral oil Sunspray 850 EC, was researched in field conditions to assess their effectiveness in limiting potato tuber PVY, PVM and PLRV infection. In spite of the greatest reduction in the number of aphids occurring following application of Mospilan 20 SP, this treatment was not as effective in limiting PVY infection as, for example, applying Sunspray 850 EC mineral oil. Mineral oil, when used on its own or in a mixture with Pirimor 500 WG, was found to be the most effective measure for limiting PVY infection (the incidence of tubers infested with PVY was reduced by 64 % relative to control, i.e. no protection). A slightly weaker effect was observed in the case of a combination of the mineral oil with full doses of Karate Zeon 050 CS with a half of a dose of Mospilan 20 SP insecticide, however only for protection against PVY. A similar trend was observed for PVM even though a significant difference was only observed for Sunspray 850EC + Pirimor 500WG. In conclusion, the application of insecticide mixtures with mineral oil in protecting against PVY infection is not always as effective as the application of the oil itself only. Addition of the insecticide may sometimes improve the efficacy of protection, however, due to the extra costs involved, not always does it have to be economical.
      PubDate: 2014-12-01
       
  • History and Origin of Russet Burbank (Netted Gem) a Sport of Burbank
    • Abstract: The importance of Russet Burbank, the world’s foremost French fry processing cultivar, requires a complete description of its origin. Its maternal lineage included Rough Purple Chili, Garnet Chili, Early Rose, and Burbank. An incorrect but widely disseminated account attributes the origin of Russet Burbank to Colorado potato grower Lou D. Sweet, with 1914 often given as the date of introduction. However, it is likely that Russet Burbank was originally released in 1902 as May’s Netted Gem by L. L. May & Co. (St. Paul MN). The names Netted Gem and Russet Burbank were used synonymously for many decades. Isoenzyme, multiplex PCR, and SNP data confirm Russet Burbank as a mutation of Burbank and do not support a seedling origin. Russet Burbank was found to be similar to Burbank in processing and nutritional characteristics. A goal of this effort is that descriptions of Russet Burbank’s lineage and origins will be corrected by seed companies in lists of potato varieties and at world repositories holding Russet Burbank and its progenitors.
      PubDate: 2014-12-01
       
  • Evolution and Management of the Irish Potato Famine Pathogen Phytophthora
           Infestans in Canada and the United States
    • Abstract: Late blight, caused by Phytophthora infestans (Mont.) de Bary, is the most historically significant and economically destructive disease of potatoes (Solanum tuberosum L.). In addition to potato, P. infestans can also infect tomato and some other members of the Solanaceae, and this has contributed to the recent late blight epidemic in Canada and the United States. Propagation of P. infestans in Canada and the United States has been mainly through asexual reproduction and this has led to the development of several dominant clonal lineages. Various P. infestans markers have been developed that are invaluable in monitoring the evolution and movement of these P. infestans genotypes. Population diversity and disease incidence has increased through the development of systemic fungicide insensitivity and the transcontinental shipment of the pathogen on late blight infected potato tubers and tomato plantlets. Introduction of the P. infestans A2 mating type to several regions of Canada and the United States has also increased the opportunity for sexual reproduction and recombination, potentially contributing to greater P. infestans genetic diversity and pathogenicity. Advances in P. infestans molecular analysis have revealed a complex pathogen with a genome capable of evolving relatively quickly. Management of late blight will therefore require new, multifaceted strategies which include monitoring pathogen evolution and implementing sustainable production practices.
      PubDate: 2014-12-01
       
  • Evidence of a Monogenic Nature of the Nz Gene Conferring Resistance
           Against Potato virus Y Strain Z (PVY Z ) in Potato
    • Abstract: Hypersensitive resistance (HR) to Potato virus Y (PVY) in potato (Solanum tuberosum) is conferred by strain-specific N genes. Two such genes have been identified in potato so far, Ny tbr conferring HR to PVYO, and Nc tbr conferring HR to PVYC. A third, putative gene Nz tbr was proposed to confer HR against a distinct strain PVYZ. However, due to the scarcity of the PVYZ isolates of PVY, no formal proof of the monogenic nature of this new gene, Nz tbr , was available until now. Here, we report on a genetic study of the Nz tbr inheritance in three crosses between cultivars Maris Bard (Ny:Nz) and King Edward (ny:nz), and Maris Bard (Ny:Nz) and Russet Norkotah (ny:nz). A fully-sequenced PVYZ isolate, L26, was used to screen the parents and progeny for a virus-induced HR phenotype in foliage. Based on the phenotypic analysis of 203 progeny, segregation of HR phenotype in the PVYZ-infected plants was found to be 1:1, indicating a monogenic, dominant nature of the Nz tbr gene. Since the PVYZ strain includes PVYNTN isolates associated with tuber necrotic ringspot disease (PTNRD) in susceptible potato cultivars, the Nz tbr gene represents a valuable source of HR against PTNRD-inducing PVY isolates. This is the first demonstration that Nz tbr is a single, dominant N gene in potato conferring resistance to the PVYZ-NTN strain.
      PubDate: 2014-12-01
       
  • Ethylene in the Atmosphere of Commercial Potato ( Solanum Tuberosum )
           Storage Bins and Potential Effects on Tuber Respiration Rate and Fried
           Chip Color
    • Abstract: Careful storage management is required to maintain post-harvest potato tuber quality. The plant growth regulator ethylene has well documented effects on potato tuber respiration rate, fried product color, and sprouting, but data on the amount of ethylene present in ventilated potato storages and how ethylene may affect tubers in commercial storage are not available. To address this need, ethylene concentration in ventilated commercial storage bins located in central Wisconsin was quantified using gas chromatography from shortly after bin filling until unloading. Samples of the storage atmosphere were collected approximately every other week from 17, 18 and 14 storage bins in 2010, 2011 and 2012, respectively. Ethylene was present transiently, and only rarely at concentrations greater than 20 nl l−1. In laboratory-scale experiments, chipping potato tubers responded to ethylene at 20 nl l−1 with an increase in tuber respiration rate, but not with an increase in post-fry chip darkening. These data indicate that the impact of atmospheric ethylene on tuber quality and storage management in ventilated potato storages is likely to be small, except near localized regions of high ethylene production.
      PubDate: 2014-12-01
       
  • High Stability of a Mitochondrial Genetic Marker mtCOII in Polish Colorado
           Potato Beetle Populations
    • Abstract: Colorado potato beetle (CPB) (Leptinotarsa decemlineata (Say in Journal of the Academy of Natural Sciences of Philadelphia 3: 298–331, 1824)) (Coleoptera: Chrysomelidae) is one of the most serious potato pests. It has been reported worldwide, from North America to Europe and Asia. In this study we analyzed the genetic diversity of a mitochondrial DNA marker – a second subunit of cytochrome oxidase (mtCOII) in Polish CPB populations to assess the possible changes of this gene sequence over time and over the country, influencing the intra-specific variability of CPB. During a three-year survey in Polish potato fields the beetles were collected from 20 evenly spaced locations of varying climatic and geographic conditions, and the nucleotide sequence of this marker was analyzed. Our research revealed that in spite of three years of sampling the mitochondrial haplotype in all individuals was fixed, and no single nucleotide change was found in any individual, indicating a high stability of this maternally inherited marker in L. decemlineata. This finding about the level of biodiversity is of importance for plant protection strategies.
      PubDate: 2014-12-01
       
  • Effects of Curing Treatment on the Browning of Fresh-cut Potatoes
    • Abstract: Browning is one of the adverse factors that affects quality and shelf life of fresh-cut potatoes. The present paper investigates the effects and mechanism of a curing treatment to control the browning of fresh-cut potatoes. Potatoes were placed in curing conditions (16 ± 1 °C, 90 % RH) for 10 days immediately after harvest. The purpose of curing is to rapidly heal any damage inflicted during harvest and thus to minimize decay and water loss. Potato slices treated with curing retained good color until day 12. Moreover, the extent of discoloration was much lower and the overall sensory quality was much better than the control, which were accompanied with an increase in polyphenol oxidase (PPO) activity and contents of gallic acid, chlorogenic acid and protocatechuic acid. Compared to control, curing treatment reduced electrolyte leakage and respiration rate, and inhibited the gene expression of phenylalanine ammonia-lyase (PAL) and polyphenol oxidase (PPO) in fresh-cut potatoes. The present data suggest that the curing treatment has the potential to improve the quality of fresh-cut potatoes and extend its shelf life.
      PubDate: 2014-12-01
       
  • The Influence of Ethephon Application Timing and Rate on Plant Growth,
           Yield, Tuber Size Distribution and Skin Color of Red LaSoda Potatoes
    • Abstract: Optimizing the response of growth regulators depends in part on finding the most appropriate application rate and timing. Preliminary trials indicate that ethephon (2-chloroethylphosphonic acid) may be useful for improving potato (Solanum tuberosum L.) tuber appearance and skin color of red-skinned cultivars, but relatively little is known about optimum application practices. Two separate trials were conducted at the University of Idaho Parma Research and Extension Center to evaluate the effect of ethephon foliar application timing and rate on plant growth, tuber yield, size distribution, and skin color of the cultivar Red LaSoda. Skin color was rated visually and by colorimeter at harvest and periodically throughout storage at 4 °C. In 2011, ethephon application timing did not influence plant height, total yield, tuber size or skin color but did affect some tuber size classes. In contrast, all of these parameters were significantly influenced by application timing in 2012. The optimum application timing to influence skin color was a relatively narrow window during initial flower development, to 10 days after initial flowering (coinciding with tuber initiation). Increasing rates of ethephon significantly reduced plant height, increased foliar injury symptoms, and reduced average tuber size, but did not influence total yield in Red LaSoda. Higher ethephon rates resulted in significantly darker tuber skin (lower L* values) and increased red color (increased chroma and reduce hue angle values) when compared to the non-treated control. Evaluation of samples held in storage showed that differences in skin color ratings at harvest were maintained throughout the storage period. It is concluded that two foliar applications of ethephon at a rate between 292 and 438 ml ha−1applied ten days apart, initiated at pre-bloom, will provide the optimum change in skin color and reduce average tuber size without reducing total yield.
      PubDate: 2014-11-08
       
 
 
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