• 한국작물학회지
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• 제44권4호
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• pp.382-390
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• 1999

In order to identify the responses of Korean soybean cultivars to sudden death syndrome (SDS), forty-two Korean cultivars and three check cultivars (Hartwig and PI 520733 are resistant; Hartz 6686 is susceptible) were tested with sorghum seed inoculum infested with Fusarium solani f. sp. glycines isolate 171 in the greenhouse. This isolate has blue pigment cultural shape on potato dextrose agar (PDA) medium. All Korean cultivars inoculated with F. solani isolate 171 showed the typical SDS symptoms and disease severity on soybean leaves in each cultivar varied at 4 weeks after inoculation. Nine cultivars were included in the most SDS susceptible group and six cultivars were included in the most susceptible group based on Duncan＇s multiple range tests (P$\leq$0.05). In results of the LSD analysis for SDS the resistant group, a total of twenty-five Korean cultivars were included in the same SDS resistant group as PI 520733 or Hartwig and fourteen Korean cultivars were included in the same SDS susceptible group as Hartz 6686. In the second experiment, ten Korean cultivars, ten U.S. cultivars, and one introduced line were compared in the same way as the first experiment Disease severity ranking of check cultivars, Hartwig, PI 520733, and Hartz 6686, were the same as in the first experiment. Within Korean cultivars, seven cultivars showed the consistent severity proportions of leaf symptoms. Disease rankings of these cultivars in this experiment were the same as those in the first experiment. Three US cultivars: Hartwig, Hartz 5454, and Forrest, three Korean cultivars： Keunolkong, Myeongjunamulkong, and Jinpumkong 2, and one introduced line, PI 520733, were included in the highest SDS resistant group. Shinphaldalkong 2, Milyang 87, and Samnamkong consistently showed the highest SDS susceptibility in both experiments. Average disease severity in the first and the second experiment were 49.56% and 45.39%, respectively.

• 한국식물병리학회지
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• 제13권1호
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• pp.13-17
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• 1997

A causal agent of bacterial soft rot occurring in soybean sprout cultivation in Korea was isolated and identified, and its incidence in several sprout-soybean cultivars was examined. Infected soybean seeds became light brown and whitish, and could not germinate until 3 days after seeding, accompanying rotting of soybean seeds and sprouts. The causal organism isolated from the rotten seeds and sprouts was identified as Erwinia carotovora subsp. carotovora on the basis of its pathogenicity, morphological and physiological characteristics and the results of the Biolog GN microplate test program. The bacterial soft rot by E. c. subsp. carotovora was firstly described in soybean sprout in Korea, and we name it“the bacterial soft rot of soybean sprout”. The disease occurred more frequently in Nam-hae and Fu-reun sprout-soybean cultivars than in Eun-ha, So-baek, and Ik-san cultivars.

• The Plant Pathology Journal
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• 제27권2호
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• pp.183-186
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• 2011

During the summer of 2005, specimens of soybean cultivars (Daepung, Daewon, Hwanggeum and Taegwang) showing frogeye leaf spot (FLS) were obtained from various areas in Korea. Eight isolates identified as Cercospora sojina were inoculated on the adaxial leaf surfaces of 63 Korean soybean cultivars; the disease responses to each isolate were evaluated 14 days and 21 days after inoculation. Based on the disease responses (resistant or susceptible) of the cultivars by the isolates, a set of cultivars (Anpeong, Bogwang, Cheongdu No. 1, Cheongja No. 3, Dachae, Daemang, Jangwon, Namhae, Sowon, Taegwang) were selected and inoculated with seven isolates for further testing pathogenic variance. Interestingly, 6 out of 7 tested C. sojina isolates revealed differential ability in infecting different soybean cultivars. This result may indicate the possibility of new race occurrence or pathogenic variation; this also presents evidence for prevalent FLS occurrence during humid and hot weather in Korea.

• Applied Biological Chemistry
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• 제43권3호
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• pp.207-212
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• 2000

국내 외산 나물콩 품종별 콩나물의 물리화학적 및 관능적 특성을 비교하였다. 백립중은 국내산이 캐나다산보다 월등히 켰으며, 장려품종이 재래품종에 비해 높게 나타났다. 또한 각 품종별 생장 수율은 백립중의 순서와 일치하였다. 수분흡수율은 초기 6시간까지 수분흡수가 급격히 일어나 종자 중량의 약 2.2배에 달하였으며 이후에는 거의 변화가 없었다. 아미노산 조성은 모든 품종에서 16종의 아미노산이 관찰되었으며, Asp, Glu, Lys 및 Arg의 함량이 총 아미노산의 50% 이상을 차지하였다. 지방산 조성은 품종에 따른 차이가 나타나지 않았으며 모든 품종에서 linoleic acid의 함량이 가장 높게 나타났다 무기질은 모든 품종에서 K와 P의 함량이 높고 Fe와 Zn의 함량이 낮게 나타났다 재배직후 배축의 압착강도는 은하가 가장 크고 준저리가 가장 작은 것으로, 자엽의 압착강도는 단엽이 가장 크고 캐나다산이 가장 작은 것으로 나타났다. 삶은 콩나물과 물에 대해 정량묘사분석한 결과 자엽의 노란정도, 자엽의 크기 등 6가지 특성에서 유의적인 차이를 나타내었다.

• The Plant Pathology Journal
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• 제35권3호
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• pp.219-233
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• 2019

Soybean cultivars susceptible to Phytophthora root and stem rot are vulnerable to seed rot and damping-off of seedlings and young plants following an infection by Phytophthora sojae. In this study, the disease responses of Japanese soybean cultivars including currently grown main cultivars during the early growth stages were investigated following infections by multiple P. sojae isolates from Japanese fields. The extent of the resistance to 17 P. sojae isolates after inoculations at 14, 21, and 28 days after seeding varied significantly among 18 Japanese and two US soybean cultivars. Moreover, the disease responses of each cultivar differed significantly depending on the P. sojae isolate and the plant age at inoculation. Additionally, the treatment of 'Nattosyo-ryu' seeds with three fungicidal agrochemicals provided significant protection from P. sojae when plants were inoculated at 14-28 days after seeding. These results indicate that none of the Japanese soybean cultivars are completely resistant to all tested P. sojae isolates during the first month after sowing. However, the severity of the disease was limited when plants were inoculated during the later growth stages. Furthermore, the protective effects of the tested agrochemicals were maintained for at least 28 days after the seed treatment. Japanese soybean cultivars susceptible to Phytophthora root and stem rot that are grown under environmental conditions favorable for P. sojae infections require the implementation of certain practices, such as seed treatments with appropriate agrochemicals, to ensure they are protected from P. sojae during the early part of the soybean growing season.

• 한국식물병리학회지
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• 제3권4호
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• pp.245-251
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• 1987

콩씨스트 선충 Race 3와 Race 4를 혼합하여 대두품종에 접종한 결과, 감수성품종인 'Lee'에서 혼합 Race의 암컷의 성숙은 각각의 Race의 암컷 성숙능력과 비교해 볼 때 유의차가 없는 것으로 나타났다. 그러나 Race 4에만 감수성인 대두품종 'Pickett'과 'Mack'에서는 혼합 Race. 접종시에 Race 4 단독에 의한 것보다 암컷의 성숙비율이 현저히 낮았다. 콩시스트 선충의 모든 Race에 감수성인 디두품종 'Lee'와 'Bragg'에서는 혼합 Race의 Race 4비율이 감소하였으며, Race 4에만 감수성인 'Pickett'과 'Peking'에서는 Race 4의 비율이 증가하였다. 또한 Race 3와 Race 4를 여러비율로 대두품종 'Lee'에서 증식하여도 Race 4의 비율이 감소되어 Race 3이 Race 4보다 더 큰 경합력을 지닌 것으로 생각된다.

• The Plant Pathology Journal
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• 제35권6호
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• pp.698-704
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• 2019

Phytophthora root and stem rot (PRSR) caused by Phytophthora sojae is one of the most destructive diseases of soybean. PRSR recently became an issue as soybean cultivation in paddy fields increased in South Korea. The management of PRSR mainly involves R-gene-mediated resistance, however, little is known about the resistance in Korean cultivars. Major Korean soybean cultivars were investigated for the presence or absence of R-gene-mediated resistance to four P. sojae isolates, two of which were new isolates. Isolate-specific reactions were observed following P. sojae inoculation. Of 21 cultivars, 15-20 cultivars (71.4-95.2%) showed susceptible reaction for each isolate. Ten cultivars were susceptible to all the isolates, and six cultivars were identified to have R-gene-mediated resistance to one or two isolates. The results of this study would provide a framework for the discovery of resistant cultivars, development of new cultivars resistant to P. sojae, and investigation of pathogenic diversity of P. sojae population in South Korea.

• 한국작물학회지
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• 제48권2호
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• pp.81-88
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• 2003

Soybeans [Glycine max (L.) Merr.] are frequently exposed to unfavorable environments during growing seasons and water is the most important factor limiting for the production system. The purpose of this study was to determine the leaf water potential changes by irrigation, and to evaluate the relationships of leaf water potential, growth and yield in soybeans. Three soybean cultivars, Hwangkeumkong, Shinpaldalkong 2, and Pungsannamulkong, were planted in growth chamber and field with irrigated treatments. Leaf water potential of three soybean cultivars was positively correlated with leaf water content during vegetative and reproductive growth stages in growth chamber and field experiments. Leaf water potentials measured for three soybean cultivars under growth chamber were higher than those of under field conditions. Higher leaf water potential with irrigated plots under field was observed compared to conventional plots during reproductive growth stages. Leaf water potentials of three soybean cultivars were continually decreased during reproductive growth stages under field and there was no significant difference among them. Number of leaves, leaf water content, pod dry weight, number of seeds and seed dry weight with irrigated plots were higher than those of conventional plots. The results of this study suggested that leaf water potential could be used as an important growth indicator during the growing season of soybean plants.

• Preventive Nutrition and Food Science
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• 제10권1호
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• pp.6-10
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• 2005

The trypsin inhibitor activity (TIA) of various soybean cultivars was evaluated by measuring the inhibition of trypsin activity using N-benzoyl-DL-arginine-p-nitro-anilide (BAPNA) as the substrate. The TIA values of eleven white shelled soybean cultivars including a glyphosate-tolerant soybean (16.58 to 17.90㎎/g) were not significantly different among cultivars. Black shelled soybeans had higher TIA values, ranging from 40.09 to 52.11㎎/g, compared to white shelled soybeans (p<0.05). When the TIA of commercially processed soybean foods were determined, no TIA was detected in soysauce, tofu and soybean paste. During conventional moist heating, the IT/sub 50/ (Time required to reach 50% inhibition of TIA) values were decreased as heating temperature and cooking pressure increased. The IT/sub 50/ values of moist heating were estimated to be 91.68, 37.71 and 19.50 min at 60, 80 and 100℃, respectively. The IT/sub 50/ value of microwave cooking was 4.75 min at medium heat, while that of the pressure cooking at 120℃ was only 2.62min. Moreover, there was a negative relationship between temperature and IT/sub 50/ values (R=0.92, p<0.01). The TIA of soybean sprouts was completely inactivated after heating at 100℃ for 5 min, although fresh soybean sprouts showed one fifth of the TIA value of white shelled soybeans. Based on our results, pressure cooking is the most effective cooking method to reduce TIA in soybeans.

• 한국자원식물학회지
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• 제24권3호
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• pp.319-323
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• 2011

The purpose of this study is to analyze antioxidant activity and multidrug resistance reversing activity in several Korean colored soybean (Glycine max Merr.) cultivars. Antioxidant activity of methanol extracts from colored soybean cultivars was evaluated by TBARS (thiobarbituric acid reactive substances), DPPH (1, 1-diphenyl-2-picrylhydrazyl) and ABTS (2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) methods. By means of TBARS, cultivar "Jeonnam #1" showed the highest activity until 7 days, and followed by "Black #1", "Jinyul" and "Black #3", showing lower activity than that of BHT (butylated hydroxytoluene). Methanol extracts of all cultivars proved that DPPH radical scavenging activity is dose-dependent. Methanol extract from cultivar "Jeonnam #1" showed highest DPPH radical scavenging activity, and followed by cultivars "Black #1". MDR (multi-drug resistance reversing) activity, however, showed the highest effect in "Black #3" and the lowest "Black #1" cultivar. These results suggest that seed colors of soybean may play an important role in antioxidant activity and MDR activity.