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  Subjects -> AGRICULTURE (Total: 746 journals)
    - AGRICULTURAL ECONOMICS (73 journals)
    - AGRICULTURE (508 journals)
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AGRICULTURE (508 journals)                  1 2 3 4 5 6 | Last

Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
Acta agriculturae Slovenica     Open Access   (Followers: 5)
Acta Agrobotanica     Open Access   (Followers: 4)
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: 2)
Acta Scientiarum. Technology     Open Access  
Acta Technologica Agriculturae     Open Access   (Followers: 2)
Acta Universitatis Sapientiae, Alimentaria     Open Access  
Advances in Agriculture     Open Access   (Followers: 2)
Advances in Agriculture & Botanics     Open Access   (Followers: 10)
Advances in Agronomy     Full-text available via subscription   (Followers: 12)
Advances in Life Science and Technology     Open Access   (Followers: 7)
AFBM Journal     Open Access  
Africa Development     Open Access   (Followers: 20)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 9)
African Journal of Agricultural Research     Open Access   (Followers: 4)
African Journal of Food Science     Open Access   (Followers: 6)
African Journal of Food, Agriculture, Nutrition and Development     Open Access   (Followers: 12)
African Journal of Horticultural Science     Open Access   (Followers: 2)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 4)
African Journal of Sustainable Development     Full-text available via subscription   (Followers: 7)
Agra Europe     Full-text available via subscription  
Agribusiness : an International Journal     Hybrid Journal   (Followers: 4)
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: 20)
Agricultural Economics     Hybrid Journal   (Followers: 50)
Agricultural History     Full-text available via subscription   (Followers: 97)
Agricultural History Review     Full-text available via subscription   (Followers: 3)
Agricultural Research     Hybrid Journal   (Followers: 6)
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: 23)
Agricultural Water Management     Hybrid Journal   (Followers: 19)
Agriculture     Open Access   (Followers: 8)
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: 36)
Agriprobe     Full-text available via subscription  
Agriscientia     Open Access  
Agrivita : Journal of Agricultural Science     Open Access   (Followers: 3)
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: 1)
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: 3)
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: 12)
American Journal of Botany     Full-text available via subscription   (Followers: 14)
American Journal of Economics and Sociology     Hybrid Journal   (Followers: 25)
American Journal of Potato Research     Hybrid Journal   (Followers: 2)
American Journal of Rural Development     Open Access   (Followers: 2)
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  
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 11)
APCBEE Procedia     Partially Free   (Followers: 2)
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: 7)
Archivos de Zootecnia     Open Access   (Followers: 4)
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: 6)
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: 4)
Australian Grain     Full-text available via subscription   (Followers: 5)
Australian Holstein Journal     Full-text available via subscription   (Followers: 2)
Australian Journal of Agricultural and Resource Economics     Hybrid Journal   (Followers: 6)
Australian Journal of Agricultural Engineering     Open Access   (Followers: 1)
Australian Sugarcane     Full-text available via subscription  
Avances en Investigacion Agropecuaria     Open Access   (Followers: 1)
Bangladesh Journal of Agricultural Research     Open Access   (Followers: 3)
Bangladesh Journal of Scientific Research     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: 25)
Biodiversity : Research and Conservation     Open Access   (Followers: 24)

        1 2 3 4 5 6 | 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  [2280 journals]
  • Tuber Symptoms Associated with Recombinant Strains of Potato virus Y in
           Specialty Potatoes Under Western Washington Growing Conditions
    • Abstract: Abstract This study documented the presence of PVYo, PVYNTN, and PVYN-Wi strains in western Washington in 2012 and 2013, representing the first detections of PVYNTN and PVYN-Wi in this potato growing region. Chieftain and Yukon Gold plantings showed an unexplained shift to a higher proportion of PVYN-Wi in 2013 compared to 2012. In 2012, 56.4 % of positive plants pooled across cultivars were affected by PVYN-Wi while 39 % were affected by PVYO. In 2013, PVYN-Wi was the highest represented strain at 79.3 %. Testing of non-symptomatic plants from pre-selected survey sites showed PVYN-Wi comprised 69.5 % in 2012 and 100 % in 2013 of the total strains identified. PVY also impacted the quality of tubers. In both a field and a greenhouse trial, there was a clear association between PVY plant infections and suberized canoe-shaped cracks in progeny tubers. Non-symptomatic (healthy) plants had significantly fewer cracked, and/or discolored and/or malformed tubers compared to suspect and symptomatic plants. Plants negative for PVY at grow-out did not produce cracked tubers while plants positive for PVY produced 22–32 % cracked tubers. Results from subsequent on-farm tuber surveys suggested the same trend, although the relationship was not as clear cut, but observations were derived from sampling in 2013 when sample sizes were limited. Because of the close geographic and economic connection between seed and ware potato production in western Washington and the results derived from these studies, we suggest a systematic and regional approach to PVY management that includes adjustments to current seed certification practices; new research and educational programs that improve knowledge of PVY biology, transmission, and effects on tuber quality; and new field management strategies to reduce vector and virus spread.
      PubDate: 2015-09-25
  • Peter Wilcox: a New Purple-Skin, Yellow-Flesh Fresh Market Potato Cultivar
           with Moderate Resistance to Powdery Scab
    • Abstract: Abstract Peter Wilcox is a new, medium-maturing, purple-skinned, yellow-fleshed potato cultivar for the fresh market. Peter Wilcox also produces light-colored chips, although it is being released primarily as a fresh market potato because of its skin and flesh colors. Tubers are attractive, smooth, with dark purple-skin, oblong shape and moderate size. Yellow-flesh intensity is equal to or slightly darker than Yukon Gold. Marketable yields of Peter Wilcox have averaged 78–97 % of various standard cultivars in multiple years of testing. Specific gravity of Peter Wilcox was lower than Yukon Gold, but higher than standard red-skin cultivars it was compared to at numerous locations. Hollow heart and internal heat necrosis in Peter Wilcox tubers have generally been less than in standard cultivars; however, slight purple-streaks in the flesh have occasionally been reported in Maine. Peter Wilcox is moderately resistant to powdery scab. It is susceptible to late blight, early blight, potato virus Y, Verticillium wilt, and common scab. Peter Wilcox is a publicly released cultivar.
      PubDate: 2015-09-25
  • The Use of Low-Dose Electron-Beam Irradiation and Storage Conditions for
           Sprout Control and their Effects on Xanthophylls, Antioxidant Capacity,
           and Phenolics in the Potato Cultivar Atlantic
    • Abstract: Abstract Low-dose electron-beam (e-beam) irradiation and storage conditions were evaluated for effectiveness in sprout control and their influence on health-promoting compounds in the potato cultivar Atlantic. Tubers were subjected to zero and 200 Gy and stored at either 4 °C or ambient temperature for 0, 10, 20, 75, and 110 days before evaluation. Xanthophyll content (Xan), antioxidant capacity (AOC), and phenolic content (PC) were quantified by spectrophotometric absorbance; xanthophyll and phenolic compounds were quantified with HPLC-DAD analysis. Tubers held at ambient conditions during storage lost weight and were visibly dehydrated. Tubers exposed to irradiation did not sprout; non-irradiated tubers sprouted, regardless of storage temperature. The exterior layer of tubers had greater total Xan, AOC, and PC than the interior layer, regardless of treatment. Storage time was the most influential factor, affecting Xan, AOC, and PC content. AOC, PC, and chlorogenic acid content increased within the first 10 days of storage, then declined with extended storage. Initially, the AOC and PC increased in irradiated tubers when compared to non-irradiated samples; however, little to no differences were observed once tubers were held in storage. Some exterior layer samples experienced an increase in Xan and PC during the later stages of storage and was believed to be associated with a concentration effect due to dehydration. E-beam irradiation inhibited sprouting during storage and prominent potato health promoting compounds were retained.
      PubDate: 2015-09-25
  • Profiling of StvacINV1 , BAM1 and INH2α Expressions in Relation to
           Acid Invertase and β-Amylase Activities During Development of
           Cold-Induced Sweetening in Indian Potato ( Solanum tuberosum L.) Tubers
    • Abstract: Abstract Cold-induced sweetening (CIS) characterized by reducing sugars (RS) accumulation during low temperature storage of potato (Solanum tuberosum L.) tubers remains a serious postharvest concern for the potato processing industry. Enzymes involved in carbohydrates metabolism and the genes modulating their activities are of paramount importance in the events associated with the development of CIS. Expression of vacuolar acid invertase gene StvacINV1, β-amylase gene BAM1 and invertase inhibitor gene INH2α and their consequence on acid invertase and β-amylase activities with resulting RS accumulation were followed in one CIS-tolerant (Kufri Jyoti) and one CIS-susceptible (Kufri Badshah) Indian potato varieties stored in cold conditions. Differential gene expression analysis showed that during cold storage, expression of StvacINV1 and BAM1 increased at low temperature and their transcripts were more expressed in the CIS-tolerant variety than the CIS-sensitive. Besides, correlation between BAM1 expression and β-amylase activity affirmed the hypothesis of several enzymes and pathways involved in starch degradation during cold storage of potato. Expression of invertase inhibitor gene INH2α however was higher in the CIS-tolerant variety than the CIS-sensitive. Correlating StvacINV1 and INH2α expressions with RS content and acid invertase activity established that post-translational regulation of acid invertase by the invertase inhibitor protein could be an important component of resistance to CIS.
      PubDate: 2015-09-03
  • The Relationship Between Sap Flow and Commercial Soil Water Sensor
           Readings in Irrigated Potato ( Solanum tuberosum L.) Production
    • Abstract: Abstract Many irrigation scheduling methods utilized in commercial production settings rely on soil water sensors that are normally purchased as off-the-shelf technology or through contracted services that install and monitor readings throughout the season. These systems often assume a direct relationship between the parameters measured by these soil water sensors (voltage, unitless values, or calibrated soil moisture values) and the water use and deficit stress of the crop. Because of this assumed relationship, these sensors are purported to be useful for triggering irrigation applications by monitoring relative changes in sensor values that represent either a “dry” or “wet” condition in the field. However, there is often little confirmation that these sensors accurately reflect crop water uptake or what soil depths will best represent that relationship. In an attempt to quantify the association between the use of soil water sensors and crop water use in a commercial potato field, measurements of soil water using capacitance probes and plant water use using sap flow sensors were monitored. Measurements were taken in two water application treatments: a normal (full) and partial irrigation schedule because it was hypothesized that the relative strength of the relationship between sensor reading and crop water use may be highly dependent on field soil water status. Relative soil moisture readings and plant water use data were compiled and both linear and quadratic regressions were performed. The correlation between sap flow and soil sensor readings was significant; but the relationship was relatively weak with the strength dependent on the soil depth that was monitored, indicating that care must be taken when utilizing sensor readings for irrigation scheduling.
      PubDate: 2015-08-15
  • Increasing In-Row Spacing Enhances Potato Virus Y and Potato Leafroll
           Virus Spread in Potato
    • Abstract: Abstract For potato, variety, tuber size, and chip or fresh markets all play a role in deciding which in-row spacing is used. Aphids are attracted to wide row spacings and as plant densities decrease, aphid densities increase. Wide in-row spacing could render ineffective any pest management tactic that exploited aphid colonization behavior through habitat manipulation if it prevented adequate row closure and enhanced aphid landing rates. To understand this, we studied the effect 20.3, 30.5, 45.7, 68.5, and 101.6 cm in-row spacing treatments had on PVY and PLRV spread. PVY infection reached 14.8 % at 101.6 cm in-row spacings and was the lowest (5.9 %) at 20.3 cm spacings. PLRV infection was highest at 101.6 cm spacings (69.1 %) and lowest at 20.3 cm spacings (44.2 %). Optimal potato production occurs on in-row spacing of 25 to 30 cm. Based on our results, current potato cultural practices in relationship to row spacing are not enhancing virus spread.
      PubDate: 2015-08-01
  • A Multiplex Reverse Transcription (RT) High-Fidelity PCR Protocol for the
           Detection of Six Viruses that Cause Potato Tuber Necrosis
    • Abstract: Abstract Viruses that cause necrotic symptoms in potato tubers can be difficult to distinguish based on symptoms and frequently require multiple molecular tests to identify the pathogen. In this study, a multiplex RT PCR high fidelity PCR protocol was developed using previously validated primers that could accurately detect six important potato viruses and detect multiple viruses in a single sample simultaneously. To test the protocol, 53 tubers previously tested using conventional PCR were retested using this multiplex protocol and blindly evaluated. In every case, the multiplex PCR results were consistent with previous findings. In addition, the multiplex PCR protocol also detected several mixed infections that were previously undetected. The results demonstrate that this technique could be a valuable assay not only for diagnostic laboratories, but also for seed certification and regulatory agency laboratories to diagnose the virus(es) that may be present in tubers with surface or internal necrotic symptoms.
      PubDate: 2015-08-01
  • ATTX961014-1R/Y a.k.a. Sierra Rose TM : A Red-Skin, Yellow-Flesh Potato
           Cultivar for the Specialty/Gourmet Market
    • Abstract: Abstract ATTX961014-1R/Y is a high yielding, red- skin, yellow- flesh cultivar which was released by Texas A&M AgriLife Research in 2012. It resulted from a cross of A90601-2RDY(♀) by Mazama(♂). ATTX961014-1R/Y is susceptible to late blight (Phytophthora infestans), potato leaf roll virus (PLRV), and potato virus Y (PVY). It is moderately susceptible to common scab (Streptomyces scabies) and black scurf (Rhizoctonia solani). In addition to attractive tubers, ATTX961014-1R/Y produces excellent tuber size distribution, with high yields of 4-6-oz (113–170-g) tubers that are desirable for the gourmet/specialty market, and low yields of over-size and cull tubers. Cooking and culinary qualities meet or exceed Yukon Gold, Red LaSoda, and Dark Red Norland. ATTX961014-1R/Y received the highest average fresh merit scores in both the Southwestern and Western Regional Trials.
      PubDate: 2015-08-01
  • Review of Potato Molecular Markers to Enhance Trait Selection
    • Abstract: Abstract Noncommercial varieties of potatoes (Solanum tuberosum L.) harbor genetic potential for improvements of disease resistance and abiotic stress tolerance in commercial potato cultivars; however, introducing traits from noncommercial varieties to breeding stock can be extremely labor intensive. Molecular genetic markers closely associated with a trait can be used to decrease the time spent phenotyping varieties. Here we review genetic markers that have been used for marker-assisted selection (MAS) in potato. Most MAS markers have been used to detect disease resistance genes, and our review focuses on those markers. Complex traits such as cold, drought and viral tolerance can be studied by comparing expressed genes; next-generation sequencing technologies will help in the discovery of trait-specific molecular markers. This review aids in summarizing the potential of these molecular tools when breeding for complex traits in potato.
      PubDate: 2015-08-01
  • Effect of Mint, Potato and Other Previous Rotational Crops on Potato
           Yields in the Columbia Basin of Oregon
    • Abstract: Abstract The effect of immediate previous rotational crops (alfalfa, corn, mint, onion and wheat) on total yields of five potato cultivars (Alturas, Premier Russet, Ranger Russet, Russet Burbank, and Umatilla Russet) in the Columbia Basin of Oregon was investigated using 9 years of data from a commercial farm. Yields from 336 potato crops grown in 171 fields between 2004 and 2012 were subjected to analysis of variance. The effect of the previous rotational crop was not significant (P = 0.20) but a significant effect of cultivar (P < 0.0001) on yield was observed, with Alturas (89 ± 9 t ha−1) and Premier Russet (87 ± 7 t ha−1) exhibiting significantly higher yields than Russet Burbank (70 ± 6 t ha−1). The effects of the number of potato crops in the field history and the number of years rotated out of potato varied among cultivars. The effects of field and year were significant (P ≤ 0.05). These results suggest that factors such as cultivar, field characteristics and annual growing conditions affect yield more than the immediate previous crop in high-input Columbia Basin potato production systems where best management practices are routinely implemented. Data support the sustainability of potato production in the region.
      PubDate: 2015-08-01
  • Site, Year and Cultivar Effects on Relationships Between Periderm Nutrient
           Contents and Common Scab Severity
    • Abstract: Abstract Common scab (CS) severity was assessed in relationship to mineral contents of potato periderm in 18 cultivars varying in maturity period and CS susceptibility. Two field experiments, one repeated in 3 years, were conducted. The effect of site, cultivar and growing period on the disease severity was always significant but not that of year to year variability. Zn, Mn and Fe periderm contents were related to site, while Ca content to cultivar effects. In both experiments, the CS severity was positively correlated to calcium and negatively to phosphorus periderm content, while correlations of CS severity to other nutrients were dependent on site or year. Since soil pH, Ca and P soil contents were not different between sites, relatively small differences in other soil chemical characteristics combined with specific cultivar nutrient requirements seemed to determine the CS severity.
      PubDate: 2015-08-01
  • Assessment of Potato Psyllid Bactericera cockerelli (Hemiptera: Triozidae)
           and Zebra Chip Disease in Four Commercial Potato Varieties in the Columbia
    • Abstract: Abstract Potato varieties may respond differently to the occurrence of arthropod pests including plant-pathogen. Although the potato psyllid, Bactericera cockerelli Sulc. (Hemiptera:Triozidae), the putative vector of Zebra Chip (ZC) disease, has been historically reported in the southern, central and western United States, the occurrence of the disease in the Pacific Northwest (PNW) is relatively new. Thus, there is a lack of information about infestation levels in commercial varieties, including russet potatoes, the predominant variety type of the region. In addition, susceptibility of russet varieties to ZC, which has become a serious production threat for the PNW since 2011, has not been thoroughly investigated. In the current 2-year study, the level of potato psyllid infestations and the impact of ZC disease in four commercial potato varieties, Ranger Russet, Russet Burbank, Umatilla Russet and Premier Russet, was evaluated. Psyllid adults were collected using a vacuum sampler based on an inverted leaf blower design, and leaf samples were used to collect eggs and nymphs. Also, ZC incidence and severity in fresh tubers was determined. The number of naturally occurring adults, nymphs and eggs per sample was similar among varieties suggesting a lack of affinity for any given variety. There was a positive relationship between the number of infective psyllids and disease incidence in 2011, while no relationship was detected in 2012. Although all varieties were equally susceptible to the disease, Ranger Russet numerically had the highest ZC incidence in tubers and Umatilla Russet the lowest.
      PubDate: 2015-08-01
  • Potato Variety Diversity, Determinants and Implications for Potato
           Breeding Strategy in Ethiopia
    • Abstract: Abstract Understanding what farmers need in potato varieties and assessing available genetic resources at the farmer and district levels is important for the conservation and improvement of potato in Ethiopia. A survey was conducted in six major potato growing districts representing different agro-ecologies, cropping systems, market outlets, and levels of new variety adoption. Seventy to ninety percent of the farmers surveyed reported growing two or more potato varieties; some farmers reported growing up to five. The greatest diversity at the district level (up to 10 potato varieties) was recorded at Gumer & Geta where there is better access to new varieties while the lowest diversity was reported in districts with low access to new cultivars. The distribution of varieties differed among agro-ecologies as did the traits that farmers were most concerned with, such as drought tolerance, late blight resistance, yield potential, marketability, food value, storage quality, adaptation to low soil fertility, time to maturity and suitability for multiple harvesting. Farmers’ decision-making processes and external factors that influence potato variety diversity were also documented. The registration of predominant local varieties and use of these local varieties as a starting point for the development of improved varieties are some of the recommendations for future potato breeding in Ethiopia. Moreover, it is necessary to consider variations in agro-ecologies, cropping systems and market outlets in the process of developing varieties suitable for farmers’ and consumers’ real needs.
      PubDate: 2015-07-11
  • Fluazinam Residue and Dissipation in Potato Tubers and Vines, and in Field
    • Abstract: Abstract Residual fluazinam in the environment may cause dermatitis and occupational asthma. Therefore, it is important to determine the dissipation behavior of fluazinam in edible raw food and in the environment. The aim of this study was to monitor a fungicide fluazinam on potato. A method for the analysis of fluazinam residue and its dissipation in potato plants and soil under field conditions was studied. Fluazinam residues were analyzed using a modified Quick, Easy, Cheap,Effective, Rugged, and Safe (QuEChERS) method and gas chromatography coupled with electron capture detector (GC-ECD). Mean recoveries and relative standard deviations (RSD) in potato plants, potatoes, and soil at three spiking levels were 85.1–99.5 and 0.7–2.8 %, respectively. The limits of quantification (LOQ) were 0.01 mg kg−1 for all three matrices. The dissipation dynamics of fluazinam were investigated in field trials in Hebei and Anhui provinces. In potato plants, fluazinam had a half-life of 2.5 days in Hebei and 3.6 days in Anhui. The half-life of fluazinam in soil was 4.7 days in Hebei and 13 days in Anhui. Terminal residues in soil samples ranged from 0.0925 to 0.949 mg · kg−1 and fluazinam was not detected in potato at pre-harvest intervals of five, seven, and 10 days. It was safe for fluazinam application on potato according to the recommended dosage and times.
      PubDate: 2015-07-03
  • Development of a PCR Diagnostic System for Detecting Andean Potato Mottle
           Virus Associated with Potato Quarantine in Korea
    • Abstract: Abstract One of the four major crops worldwide is the potato. Despite the production of potatoes in Korea, most of them are being imported from other countries. The 15 viral diseases are monitored and tested whenever potatoes are imported in Korea. In this study, there are 2 sets of RT-PCR primer for diagnosing the Andean potato mottle virus (APMoV), which is a type of monitored quarantine viruses infecting potatoes, wherein each nested PCR and modified-positive control plasmid that can verify laboratory contamination and false positive response were developed. The RT-PCR primer sets for analyzing the APMoV were 315 and 732 bp amplified, and each nested PCR were 128 and 391 bp amplified. In addition, the modified-positive control plasmid, which can be used for the PCR diagnosis system, was also developed in order to realize a precision test system for fast and accurate diagnoses of APMoV in imported potatoes. The APMoV PCR diagnosis system, which has been developed in this study, can be used for a possible quarantine in the future. It can also contribute to the increase in the potato production worldwide.
      PubDate: 2015-06-23
  • Influence of Climatic Conditions on Development and Yield of Potato Plants
           Growing Under Organic and Conventional Systems in Poland
    • Abstract: Abstract A field study was conducted in 2012 and 2013, two seasons with very different temperature and rainfall patterns in Poland, with 2012 being a normal good year for potato production, and 2013 being poor. Four potato cultivars (Viviana, Gawin, Legenda, Gustaw) were grown under organic and conventional systems. Morphological and physiological characteristics of the plants were determined, as well as tuber yield and size distributions. As expected, the organic production system resulted in less than optimal plant growth, tuber yield and tuber size even in the normal season of 2012. But the reduction in these parameters was even more pronounced in 2013. For example, in the poor growing year, total yield was reduced by 45 % in conventional, but 55 % in organic. Tuber size was particularly impacted in organic production in an unfavorable year, as small tubers increasing by 39 % in conventional, but 149 % in organic. Thus, the impact of unfavorable weather conditions results in greater losses in crop value for organic growing systems than conventional.
      PubDate: 2015-06-20
  • Importance of Early-Season Nitrogen Rate and Placement to Russet Burbank
    • Abstract: Abstract Early-season nitrogen (N) is necessary for optimal potato vegetative growth and creating an optimal growing condition for high yields; however, on sandy soils it also increases the risk of losing fertilizer N through leaching. This 3-year field experiment evaluated whether a smaller amount of N placed near the plant roots could provide the benefits associated with higher rates of early N applications that were less well placed. Two rates of N applied at emergence (40 or 80 kg N ha−1) were spot-placed (5 to 7 cm around each plant), banded along the row, or broadcast applied, and compared to no N or where all of the in-season N was applied at tuberization. All plots except the zero N controls received a total of 170 kg ha−1 of in-season N. Where emergence N was spot-applied in some years, tuber numbers were reduced compared to where the N was broadcast, and in these situations, resulted in increased tuber size and higher yields of prime-sized tubers (U.S. No. 1, 170 to 370 g). Where differences existed, results from banded treatments were intermediate between those from the spot and broadcast treatments. However, in spite of apparent N placement effects likely associated with having a higher concentration of N near the plant roots early in the season, no differences were evident between the two rates of emergence N within a given placement. In this experiment, total yields were not affected by rate or placement of emergence N. Overall, this experiment provides support for the concept of placing early-season N near the plant roots, and band applications along the row may be a grower-manageable alternative for achieving this goal.
      PubDate: 2015-06-20
  • Influence of Mating Structure on Agronomic Performance, Chip Fry Color,
           and Genetic Distance Among Biparental Tetraploid Families
    • Abstract: Abstract The impact of mating structure on progeny performance is not routinely analyzed in potato breeding programs, despite the importance of choosing parental lines. Varying degrees of assortative and disassortative mating can have a significant effect on the agronomic performance and cold chipping ability of potato breeding clones. A disassortative mating strategy of crossing parents from different market types can incorporate commercially relevant traits into a market class which lacked that trait. Here we report the effect of mating structure in three breeding families created from parental lines from different market classes, within the same market class, and from self-pollination. Disassortative mating structure produced clones with increased yield and tuber size while assortative mating produced clones with improved cold-storage chipping ability. Inbreeding depression was observed for yield, tuber traits, and chip color in the selfed progeny. Chip color in a russet type clone was improved through crossing with an elite chipping parent, demonstrating a viable method for improving russet processing quality. Mating structure explained a significant proportion of phenotypic variance for yield, tuber, and chipping traits across the three families. Discriminant analysis of principal components and genetic distance based on SNP markers from the SolCAP project were able to discriminate among family types and were informative about the relative diversity generated from each particular cross. A number of promising genotypes from both the russet × chipper family and the chipper × chipper families were identified which outperformed parental varieties for chip color and tuber size.
      PubDate: 2015-06-20
  • Germplasm Release: Three Potato Clones Incorporating Combined Resistances
           to Early Blight from S. palustre and Late Blight from S. bulbocastanum
           into a S. tuberosum Background
    • Abstract: Abstract Three clones in a segregating population derived from a cross between the disease resistant parents +297 and K41 are being released as germplasm with resistance to both early blight, caused by Alternaria solani, and late blight, caused by Phytophthora infestans. The source of resistance to early blight in +297 is the wild species S. palustre and late blight resistance in K41 is conferred by the RB gene from S. bulbocastanum. These clones, named BR3, BR5, and BR85 (BR for Blight Resistant), yield well at a temperate zone latitude. In addition to containing heritable resistance to both early and late blights, these clones possess multiple other desirable agronomic traits, are fertile, and readily cross to cultivars.
      PubDate: 2015-06-01
  • SSR and e-PCR Provide a Bridge Between Genetic Map and Genome Sequence of
           Potato for Marker Development in Target QTL Region
    • Abstract: Abstract The aim of this study was to increase marker density in a previously identified late blight resistance QTL in a diploid potato population. SSR markers from the reference potato genome sequence were located by e-PCR in the QTL region in the chromosome 9 genetic map of the diploid potato population B3C1HP, and utilized to identify more candidate genes locating between the SSR markers. After verified by PCR and genetic mapping, two SSR markers and two DM candidate genes were mapped in the QTL peak in the maternal genetic map of B3C1HP. The new markers narrowed down the average 2-LOD support interval from 2.6 to 1.4 cM. The new markers on the LOD peak are valuable for fine mapping and positional cloning of the alleles in late blight resistance QTL. This study proves that combination of SSR and e-PCR is an effective way to develop markers in target QTL region.
      PubDate: 2015-06-01
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