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AGRICULTURE (513 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: 5)
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   (Followers: 1)
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: 21)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 10)
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: 13)
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   (Followers: 2)
Agribusiness : an International Journal     Hybrid Journal   (Followers: 6)
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 Commodities     Full-text available via subscription  
Agricultural Economics     Hybrid Journal   (Followers: 50)
Agricultural History     Full-text available via subscription   (Followers: 119)
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: 38)
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)
Agrociencia Uruguay     Open Access  
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  
Agrovigor     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: 25)
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: 4)
Asian Journal of Agricultural Research     Open Access   (Followers: 4)
Asian Journal of Medical and Biological Research     Open Access  
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)

        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  [2276 journals]
  • Biotech Potatoes in the 21st Century: 20 Years Since the First
           Biotech Potato
    • Abstract: Abstract Potato is the world's most important vegetable crop, with nearly 400 million tons produced worldwide every year, lending to stability in food supply and socioeconomic impact. In general, potato is an intensively managed crop, requiring irrigation, fertilization, and frequent pesticide applications in order to obtain the highest yields possible. Important traits are easy to find in wild relatives of potato, but their introduction using traditional breeding can take 15–20 years. This is due to sexual incompatibility between some wild and cultivated species, a desire to remove undesirable wild species traits from adapted germplasm, and difficulty in identifying broadly applicable molecular markers. Fortunately, potato is amenable to propagation via tissue culture and it is relatively easy to introduce new traits using currently available biotech transformation techniques. For these reasons, potato is arguably the crop that can benefit most by modern biotechnology. The benefits of biotech potato, such as limited gene flow to conventionally grown crops and weedy relatives, the opportunity for significant productivity and nutritional quality gains, and reductions in production cost and environmental impact, have the potential to influence the marketability of newly developed varieties. In this review we will discuss current and past efforts to develop biotech potato varieties, traits that could be impacted, and the potential effects that biotech potato could have on the industry.
      PubDate: 2015-11-19
  • Conservation Management Practices and Rotations for Irrigated Processing
           Potato in Southern Alberta
    • Abstract: Abstract Irrigated processing potato production is an important part of southern Alberta’s agricultural economy. A 12-year (2000–11) study compared conservation (CONS) and conventional (CONV) management for potato in 3- to 6-year rotations which also included dry bean (Phaseolus vulgaris L.), sugar beet (Beta vulgaris L.), and soft wheat (Triticum aestivum L.). Oat (Avena sativa L.) and timothy (Phleum pratense L.) were added to the longest rotation. Conservation management included reduced tillage, cover crops, feedlot manure compost addition, and solid-seeded dry bean. Averaged over 12 years, a 5-year CONS rotation (potato–wheat–sugar beet–wheat–dry bean) resulted in 18 % higher marketable tuber yield than a 3-year CONV rotation (potato–dry bean–wheat). Reduced incidence of potato early dying was also found with CONS management. Results indicate that integration of CONS management practices led to yield and disease control benefits without negatively impacting tuber quality.
      PubDate: 2015-11-17
  • Biological Control of Potato Late Blight Using Isolates of Trichoderma
    • Abstract: Abstract Potato late blight, caused by Phytophthora infestans is a most destructive plant pathogen and can lead to serious economic losses in potato. Some strains of the Trichoderma genus can act as potential biocontrol agents and are able to control many plant disease in crops. The present study was carried out to screen effective Trichoderma isolates against P. infestans and to study the potential modes of action involved. In vitro bioassays between P. infestans and Trichoderma isolates demonstrated that the P. infestans colony was significantly inhibited and overgrown by Trichoderma isolates. Antifungal metabolites produced by the isolate HNA14 significantly prevented the linear growth of the P. infestans colony. Mycoparasitism appeared to contribute to the aggressive nature of the Trichoderma isolate HNA14 against P. infestans when observed under scanning electron microscope (SEM). In planta bioassay, the isolate HNA14 significantly reduced the disease index, increased the plant stem height, and foliar fresh and dry weight. Under field conditions, the Trichoderma isolate HNA14 was the most efficient against the pathogen out of all Trichoderma strains, and significantly reduced the disease severity compared to the control. Collectively, the strategic approach described in this paper demonstrates an effective way of screening a biocontrol agent for control of potato pathogens.
      PubDate: 2015-11-16
  • A Toolbox of Potato Genetic and Genomic Resources
    • Abstract: Abstract Access to genetic and genomic resources can greatly facilitate biological understanding of plant species leading to improved crop varieties. While model plant species such as Arabidopsis have had nearly two decades of genetic and genomic resource development, many major crop species have seen limited development of these resources due to the large, complex nature of their genomes. Cultivated potato is among the ranks of crop species that, despite substantial worldwide acreage, have seen limited genetic and genomic tool development. As technologies advance, this paradigm is shifting and a number of tools are being developed for important crop species such as potato. This review article highlights numerous tools that have been developed for the potato community with a specific focus on the reference de novo genome assembly and annotation, genetic markers, transcriptomics resources, and newly emerging resources that extend beyond a single reference individual.
      PubDate: 2015-11-12
  • The Viability of Winter Sporangia of Synchytrium endobioticum (Schilb.)
           Perc. from Poland
    • Abstract: Abstract The longevity, infectivity and virulence of winter sporangia of Synchytrium endobioticum, the causal agent of potato wart disease, were studied in soil collected from an infested plot 43 years since the last observed infection. The demarcated plot was located in a mountainous area of the central part of Sudetes Mountain range in Poland and no potatoes were grown in the plots over that period. Sporangia of S. endobioticum were collected from the samples and retained viability after 46 years. Infectivity of the fungus was tested using modified Potoček’s tube test. The ability of the spores to invade and replicate in potato host tissue was demonstrated using sporangia collected after 43 years. The virulence of the obtained isolates was tested with the Glynne-Lemmerzal method. Two different pathotypes were identified: 1(D1), the most widely distributed in Europe and 3(M1), a unique Polish local pathotype, which was isolated and identified for the first time from the same location in 1965.
      PubDate: 2015-11-11
  • Scheduling Reduced Irrigation on ‘Atlantic’ Potato for Minimal
    • Abstract: Abstract Droughts are common in the US High Plains, causing declining water availability and lowering water allocations. The objective of this 4-year field study was to identify a period of water deficit least detrimental to potato production. Fully irrigated ‘Atlantic’ potato received 62–63 cm of applied water. Total applied water was reduced by 25 % in three seasonal periods, 50 % water from emergence to 8 weeks after emergence (WAE) (early stress), 50 % water from 8 to 13 WAE (late stress), and 50 % from 0 to 5 WAE and again from 10 to 13 WAE (outer stress). Main plots were irrigation regime and split with three N levels, 101, 168, and 235 kg/ha. Soil and petiole N were higher when applied water was reduced. Lower irrigation inhibited growth, i.e., canopy height (10–20 %), weight (20–30 %) and leaf area index (50–70 %). Yield decreased 25 % and 13 % with early and outer stress, respectively. Chip color was darkest with early stress compared to fully irrigated plots. Common scab occurrence was greater in early stress than with other regimes. N rate had no effect on canopy growth, yield, chip color, or common scab. If applied water is reduced 15 cm, it is best late in the season and worst between 5 and 8 WAE compared to fully irrigated plants
      PubDate: 2015-11-05
  • Colorado Potato Beetle Resistance in Solanum oplocense X Solanum tuberosum
           Intercross Hybrids and Metabolite Markers for Selection
    • Abstract: Abstract S. oplocense Hawkes, a wild relative of the potato S. tuberosum L. and source of resistance against the Colorado potato beetle Leptinotarsa decemlineata (Say) (CPB), was intercrossed with S. tuberosum. Backcross clones carried varying levels of resistance. Differences in foliar metabolites between resistant and susceptible clones were analyzed using liquid chromatography-mass spectrometry (LC-MS). Supervised machine learning classification methods uncorrelated shrunken centroids (USC), k-nearest neighbor (KNN) and support vector machines (SVM) were applied to develop algorithms that can classify resistant and susceptible plants using the metabolite data. Five metabolites were found to have a low error rate of prediction of CPB resistance. The five metabolites included two glycoalkaloids previously associated with resistance and susceptibility to CPB, dehydrocommersonine and solanine, respectively. Resistance was associated with a change in composition of glycoalkaloids to higher ratios of dehydrocommersonine over solanine.
      PubDate: 2015-11-05
  • Identification of Farmer Priorities in Potato Production Through
           Participatory Variety Selection
    • Abstract: Abstract A substantial number of farmers in northwest Ethiopia grow potato in the dry season (“Belmehr”, March to August) when rainfall is not dependable for the growth of the crop, resulting in lower yield. Ethiopian Agricultural Research Institutes have tried to change the situation by releasing new late blight tolerant varieties that potentially could allow for production of the crop in the rainy season (“Meher”, May to October). Despite these efforts, the majority of the farmers still grow potato in the Belmehr season using older, local varieties. Cognizant of this fact, this study aimed to characterize the major potato production problems in the two seasons, to identify the traits that farmers consider most important when selecting potato varieties, and to assess the performance of widely grown local as well as newly developed varieties. The study was conducted at sites representing two major agroecological zones in northwest Ethiopia and during both production seasons using 12 varieties (9 local and 3 new) with a ‘participatory variety selection’ approach. During the Belmehr season, erratic rainfall resulted in low yield and lower average tuber weight. By contrast, in the Meher season, late blight, desiccating wind and severe precipitation, including hail, limited production. These factors were important in both agroecological zones, with varying degrees of importance. Twenty-three traits were found to influence the varieties that farmers selected, with the degree of importance of each trait differing between agroecological zones and gender groups. Some local varieties yielded as well as new varieties in both seasons. Overall, we found participatory variety selection to be an effective approach for identifying factors important for the adoption of potato varieties, including factors that may not be addressed in conventional potato breeding programs.
      PubDate: 2015-11-05
  • The Influence of Foliar Ethephon Application on Economic Returns of Red
           LaSoda Potatoes
    • Abstract: Abstract The successful marketing of fresh potatoes is heavily reliant upon tuber appearance. Past attempts to improve the color and appearance of fresh potatoes have included the adoption of new cultivars, application of waxes during packing, control of skin damaging diseases, and foliar application of growth regulators. An analysis of the potential economic impact of the use of the plant growth regulator ethephon(2-chloroethylphosphonic acid) was conducted. Data on the influence of ethephon application rate on tuber size distribution and yield was collected from field trials on the red-skinned cultivar Red LaSoda during 2011 and 2012. These data were then used in conjunction with records of red potato prices for the most recently available five crop years to calculate gross returns. Production costs, chemical and application costs, and packing costs were then subtracted to calculate net economic returns. No adjustment in market value was made to account for the improved skin color measured due to ethephon application, as there are no data to support this assumption. Ethephon rate did not significantly affect total yield in either year, but did influence the distribution of various market classes (A, B and Creamers) in 2012. There was some influence in net value by size class, but total net return was not significantly affected in either year. While ethephon is not a very expensive addition to the total cost of production, it does not appear to provide a significant economic benefit based on the change in tuber size distribution alone.
      PubDate: 2015-10-28
  • The Potato Tuber Disease Occurrence as Affected by Conventional and
           Organic Farming Systems
    • Abstract: Abstract A study was conducted which aimed to investigate the effect of farming systems (FS) (four conventional with increasing mineral N fertilizer amounts 0–150 kg of N ha−1) vs. two organic with catch crops (CC) and cattle manure (CC + M)) under the same five crop rotation system on the occurrence of tuber diseases such as common scab (Streptomyces spp.), silver scurf (Helminthosporium solani), dry rot (Fusarium spp.), and soft rot (Pectobacterium spp.). As the average of the first rotation years 2009–2011, the FS had a significant effect on the occurrence of silver scurf, dry rot and common scab (surface cover <30 %). The organic systems had significantly more tubers (around 39 %) infected with common scab (surface cover 4–15 %) than in conventional systems (around 25 %). However, when the surface lesion severity increased (surface cover 16–30 %) then differences occurred only between organic systems (in system Organic CC 4.1 % and in system Organic CC + M 13.1 % of tubers infected). The Organic CC system had significantly fewer tubers infected with silver scurf compared to all conventional farming systems (10.5 % vs 17.8–23.4 %). During the first and after the second disease measurement there were less tubers infected with dry rot in Organic CC (0.8–0.9 %) and conventional N high (0.5–1.4 %) systems compared to N low (1.8–3.0 % of tubers infected) system. Soft rot infections were not influenced by farming systems. Thus we conclude that it is possible to influence the occurrence of some tuber diseases with FS.
      PubDate: 2015-10-28
  • Erratum to: Influence of Location, Year, Potato Rotation, and Chemical
           Seed Treatment on Incidence and Severity of Silver Scurf on Progeny Tubers
    • PubDate: 2015-10-20
  • Sensitivity to Tuber Necrosis Caused by Potato Mop-Top Virus in Advanced
           Potato ( Solanum tuberosum L.) Breeding Selections
    • Abstract: Abstract Potato mop-top virus (PMTV) is transmitted by the powdery scab pathogen (Spongospora subterranea f.sp. subterranea (Sss)) and no effective disease control methods are currently available for either pathogen. Eighty-one advanced breeding selections of potato (Solanum tuberosum L.) from different market classes and a broad genetic base were evaluated for sensitivity to PMTV-induced tuber necrosis in a field in North Dakota known to be infested with PMTV. Commercial cultivars, ranging from sensitive to tolerant in their reaction to PMTV-induced tuber necrosis incidence were included in each market class as internal controls. Results of tuber assessments revealed high variability in PMTV-induced tuber necrosis incidence and severity among selections. Based on PMTV-induced tuber necrosis incidence results over a two-year period, a total of 17 advanced selections were found to be tolerant, nine - moderately tolerant, eight - moderately sensitive, and six were found to be sensitive. The russet-skinned types had lower tuber necrosis incidence than the red-, white- and yellow-skinned types. Increases in the incidence of PMTV tuber necrosis during the storage period was influenced significantly by selection type and skin-color. Further studies are needed to investigate if tolerant selections are resistant to the virus to determine their suitability as parents in breeding programs to introduce PMTV resistance into commercial potato cultivars. In the short term, tolerant selections with other desirable agronomic characteristics could be released as commercial cultivars for growers to utilize as a means to limit the economic impact of PMTV-induced tuber necrosis.
      PubDate: 2015-10-19
  • AtCBF1 Overexpression Confers Tolerance to High Light Conditions at Warm
           Temperatures in Potato Plants
    • Abstract: Abstract We characterized transcriptional responses of potato plants to multiple abiotic stresses and used this information to identify potential mechanisms through which over-expression of the stress related transcription factor CBF1 from Arabidopsis thaliana (AtCBF1) confers multiple stress tolerance. Most transcriptional changes were specific to each condition, but genes involved in phenyl-propanoid biosynthesis were affected by all abiotic stresses evaluated. Interestingly, over-expression of AtCBF1 in potato plants not only conferred tolerance to low temperatures, as previously reported, but also to high-light conditions at 22 °C, suggesting that it confers multiple stress tolerance by enhancing the ability of plants to cope with an excess of radiant energy. Finally, we found that transcriptional changes triggered by abiotic stress were much larger than those resulting from AtCBF1 over-expression in potato, revealing that overexpression of an heterologous transcription factor causes minor alterations in the plant transcriptome in comparison to transcriptional changes triggered by abiotic stresses.
      PubDate: 2015-10-19
  • 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: 2015-10-01
  • 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
  • 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
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