• 농업과학연구
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• 제23권1호
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• pp.150-158
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• 1996

The potato has been used as a part of key staple foods in Korea. Recently, the demand for the potato tends to increase due to its nutritional Quality, and the Quantity of imports has rapidly been increasing. Contamination of seed potato by pathogens especially could cause a severe reduction of total production. In order to solve the problem, Korea Research Insistute of Bioscience and Biotechnology(KBIBB) developed the new commodity called a "potato microtuber". Before its production and distribution, researches on new commodity should be undertaken in many aspects, especially in terms of economic aspects. The main objectives of this study are to measure the economic value of the potato microtubers and to forecast its spreading effects and to examine the Contingent Valuation Method(CVM) could be accepted in the economic analysis for a new agricultural product, here in potato microtubers. Through the regression results, the consumer behavior analysis had performed for potential users of potato microtubers, and through the demand function derived by the consequence of functional relationship, consumer's surplus was estimated.

• The Plant Pathology Journal
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• 제19권3호
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• pp.184-187
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• 2003

Verticillium wilt was first observed in 2001 on potatoes (Solanum tuberosum) cv. Superior at Daegwallyong area, one of the major seed potato producing areas in Korea. The wilted potato plants showed typical symptoms including gradual yellowing and interveinal necrosis. There was discoloration in the vascular tissues of the infected stems which turned light brown. Fungal isolates from discolored vascular tissues were whitish to creamy with folding on potato dextrose agar medium, where they used to produce resting dark mycelia but no micro-sclerotia. Conidiophores were septate with side branches, swelled at the base, and arranged in a whorl. Conidia were 2.5-11.2$\times$2.0-4.5 $\mu\textrm{m}$ um in size and were borne in small clusters at the tips of phialides. Optimal temperature range for mycelial growth was $25-30^{\circ}C$. Based on these cultural and morphological characteristics, the fungus was identified as Verticillium albo-atrum Reink & Berth. Pathogenicity tests by root dipping method revealed that the fungus caused the same symptoms as observed in naturally infected potato plants. This is the first report of Verticillium wilt on potato caused by Verticillium albo-atrum in Korea.

• 한국균학회지
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• 제21권4호
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• pp.316-322
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• 1993

Examination by scanning electron microscopy and potato-dextrose agar medium showed that the dry seeds of R. raetam were externally free of fungi. When planted in sandy loam soil, the seeds become colonized with eleven soilborne fungal species. The fungi were isolated on cellulose agar, pectin agar and lignin agar media. Aspergillus flavus, A. niger, Penicillium capsulatum and Fusarium oxysporum had broad occurrence and recovered on the three media. The production of hydrolytic enzymes by the isolated fungi depends on the substrate and species. P. capsulatum, P. spinulosum and A. niger had wide enzymatic amplitude and they were able to produce cellulolytic, pectolytic and lignolytic activities on corresponding substrates as well as on seed coat containing media. The lignolytic activities of the isolated species except Chaetomium bostrychods and Trichoderma viride were enhanced on applying the seed coat materials as C-source rather than using lignin. Soaking R. raetam seeds in culture filtrates of the most fungi grown on seed coat supplemented media induced pronounced and distinct stimulating effect on seed germination. The most effective filtrates were those of P. capsulatum, P. spinulosum and Sporotrichum pulverulentum.

• 농약과학회지
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• 제2권2호
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• pp.102-107
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• 1998

본 연구의 목적은 강원도 고냉지 씨감자 경작자들의 잡초방제 및 제초제 사용에 따른 문제점을 파악하는데 있다. 강원도 평창군, 횡성군, 강릉시에 거주하는 씨감자 경작자 196명을 대상으로 설문조사를 실시한 후, 결과를 통계 분석하였다. 씨감자 경작자들은 경작지에 문제가 되는 주요 잡초로 여뀌, 명아주, 쑥, 닭의장풀, 바랭이, 봄여뀌, 별꽃, 쇠뜨기, 쇠비름을 들었다. 전체 응답자의 58%는 paraquat, pendimethalin, metribuzin 등 많은 제초제들을 단독 혹은 혼합하여 기준약량보다 2배처리하여도 여뀌, 쇠뜨기, 쑥, 둑새풀, 닭의장풀, 피는 방제가 힘들다고 답하였으며, 또 응답자의 34%는 현재 사용중인 제초제들을 $3{\sim}5$년 정도 연용하고 있다고 밝히고 있다. 조사대상자들은 paraquat, fluazifop-butyl 등 감자경작용으로 등록되지 않는 제초제들도 사용하고 있으며, 현재 사용되고 있는 제초제는 경작자 본인의 경험에 의한 선택(51%)과 농약상의 추천(34%)에 의하여 주로 선정되고 있는 것으로 밝혀졌다. 전체 응답자의 67%는 제초제의 남,오용으로 인하여 작물피해를 입은 경험이 있고, 75%는 제초제 처리시 혹은 후 제초제에 중독된 경험이 있다고 응답하였다. 강원도 고냉지 씨감자 경작자들은 제초제의 남,오용으로 경제적 피해는 물론 중독증상까지 경험하고 있으므로, 이 지역 경작자를 대상으로 한 올바른 제초제의 선정 및 사용법에 대한 체계적인 교육프로그램이 개발, 보급되어야할 것이다.

• 한국응용곤충학회지
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• 제16권3호
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• pp.145-148
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• 1977

감자바이러스 S(PVS)의 진단, 동정 및 씨감자의 검정에 이용할 항혈청을 만들기 위하여 이병주로부터 PVS를 순수분리 순화하여 항혈청을 제조하였다. PVS는 지표식물파 전자 현미경으로 순수 분리하여 Nicotiana debneyii에서 증식하여 순화하였다. 순화된 PVS의 순화도는 1.18mg/ml이었으며 이것을 1.5ml씩 7일 간격으로 5회 .토끼에 주사하였으며 마지막 주사후 10일에 채혈하여 항혈청을 분리하였다. 제조된 PVS항혈청의 역가는 미량침강법에 의하여 1/2048로 나타났다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2002년도 춘계공동학술발표회요약집
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• pp.427.2-427
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• 2002

• 한국작물학회:학술대회논문집
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• 한국작물학회 2023년도 춘계학술대회
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• pp.111-111
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• 2023

• Journal of Nutrition and Health
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• 제29권10호
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• pp.1087-1095
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• 1996

The study was carried out to investigate a new type of functional foods with hypotensive effect which is critical in the prevention and treatment of hypertension and related circulatory diseases. The experimental diets(A, B, C) were prepared from plant based ingredients such as buckwheat, potato, perilla seed with different ratios formulated as an edible form appropriate for human consumption according to AIN-77 standard. Control group(D) was fed commercial rat chow. Twety-four 15-week-old SDR(Sprague Dawley rats) and twenty-four 20-week-old SHR(spontaneously hypertensive rats), weighing 200g respectively, were assigned to 4 treatments of 6 rats each in a completely randomized design. Blood pressure was measured at 7 day interval by tail-cuff sphygmomanometer using an IITC cuff pump and amplifier. The growth rates of both SHR and SDR were not statistically different in comparions with the control except those of diet B and C in SDR and SHR, respectively(p<0.05). When exprimental diets were fed, systolic blood pressure of SDR and SHR at day 28 had been lowered by 17-20 mmHg(ave. of 19.6mmHg for both strains) compared with the reference pressure at day 0. The levels of HDL-cholesterol were increased, while the levels of LDL-cholesterol consistently decreased in both strains when experimental diets were fed(p<.05). Plasma total cholesterol levels were not different among treatments. Plasma triglyceride levels were higher in control diet(commercial rat chow) due to two times higher fat content of control diet itself(p<.05). Atherogenic indices were lower compared to those of control when the experimental diets were fed in both strains (p,.05). The results suggest that the antihypertensive diets mainly consisting of plant-based ingredients may possibly effective in relieving hypertension as well as circulatory diseases.

• 한국작물학회지
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• 제48권3호
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• pp.147-151
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• 2003

제주지역에서 상위급 씨감자 가을채종재배 시 폴리에칠렌(PE)멀칭이 감자의 생육 및 수량성에 미치는 효과를 구명하고자 일반종서, 경삽 및 소서 플러그묘를 2001년 8월 20일에 직파 또는 정식한 후 무멀칭, 투명 및 흑색 PE멀칭재배를 하여 얻어진 결과를 요약하면 다음과 같다. 1. 주당 총서수는 멀칭처리에 큰 영향을 받지 않고 4.6개 내외였으나, 종묘종류별로는 직파구에서 5.14개로 가장 많았고 경삽묘 및 소서묘정식구에서는 각각 4.15, 5.15개였다. 2. 총서수량은 무멀칭구에서 21.16톤/ha이었는데, 투명 및 흑색 PE멀칭에 의하여 각각 16, 8% 증수되었고, 경삽묘정식구가 가장 많았으며 다음으로 소서묘, 직파구 순이었다. 3. 평균서중은 무멀칭구에서 평균 72.2g이었고 투명 및 흑색 PE멀칭에 의하여 각각 14, 12%증가되었는데, 멀칭효과는 경삽묘정식구에서 가장 컸었다.

• Journal of Biosystems Engineering
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• 제32권2호
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• pp.109-114
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• 2007

In mass production of seed-potato plantlets, the processes for in vitro propagation and ex vitro acclimatization with a high cost should be improved by a culture system with environmental control using scaled-up culture vessels. The experiment was conducted to design a hydroponic culture system for enhancement of growth and development of seed-potato (Solanum tuberosum) plantlets cultured under photoautotrophic (without sugar in culture medium) conditions with controlled light intensity and ventilation rate. The culture system was consisted of scaled-up culture vessels, ventilation pipes, a multi-cell tray and an environmental control system (ECS) for optimum controlling in temperature, light intensity, ventilation rate, and culture-medium supply. Growth and development of the plantlets was significantly increased under the ECS compared with a conventional culture system (CCS) of photomixotrophic culture (with sugar in culture medium) using small scale vessels. For 21 days, leaf area of the plantlets was expanded more than 2 times, and number of internodes also approximately 4 times greate. under the ECS. In addition, the photoautotrophic growth in sweetpotato (Ipomoea batatas) and chrysanthemum (Chrysanthemum morifolium) plantlets was greater more than 2 times compared with the CCS.