Evaluation of soybean cultivars for resistance to phomopsis seed decay in Korea
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J. Crop Sci. Biotech. 2012 (June) 15 (2) : 85 ~ 91 DOI No. 10.1007/s12892-012-0029-7 RESEARCH ARTICLE
Evaluation of Soybean Cultivars for Resistance to Phomopsis Seed Decay in Korea Suli Sun1, Kyujung Van1, Moon Young Kim1, Yeong-Ho Lee1, Jong-Min Ko2, In-Youl Baek2, Yin-Won Lee3, Weixian Liu4, Suk-Ha Lee1,5* Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea 2 Department of Functional Crop, National Institute of Crop Science, RDA, Milyang 627-130, Korea 3 Department of Agricultural Biotechnology and Center for Fungal Pathogenesis, Seoul National University, Seoul 151-921, Korea 4 Yanbian Seed Management Station, Guanghua Road 8, Henan Street, Yanji City, Jilin province, China 5 Plant Genomics and Breeding Institute, Seoul National University, Seoul 151-921, Korea 1
Received: April 3, 2012 / Revised: May 13, 2012 / Accepted: May 25, 2012 Ⓒ Korean Society of Crop Science and Springer 2012
Abstract Phomopsis seed decay (PSD), primarily caused by Phomopsis longicolla, is one of the most important seed-borne diseases and causes serious seed yield loss in soybean. This study was performed to evaluate reactions to P. longicolla in Korean soybean major elite cultivars, which were mainly used for parents of genetic mapping populations. The natural incidence of P. longicolla and other seed-borne fungi was determined in the fields at three different locations in South Korea during 2009 - 2010. The significant differences in sensitivity to seed-borne diseases were shown among cultivars. Taekwangkong exhibited the greatest resistance to P. longicolla with average incidence of 0.33% and other seed-borne fungi with average incidence of 6.17%. Moreover, Taekwangkong was free of P. longicolla infection both in Milyang and in Daegu. To confirm the effective resistance source, the Korean virulent strain of P. longicolla, SSLP-3, was inoculated artificially on soybean of R4-R7 growth stage in the greenhouse. Taekwangkong exhibited a higher level of resistance to P. longicolla with significantly lower incidence (8.67%) than any other Korean elite cultivars (78.0 99.33%) and the previously reported resistant PI genotypes (35.0 - 55.67%). Further verification of resistance in Taekwangkong to P. longicolla by testing germination vigor of healthy seeds in vitro showed a higher germination rate than those of the susceptible cultivars. It could be suggested that Taekwangkong is a newly identified resistance source and the better source of resistance to P. longicolla to develop breeding populations for exploiting resistance gene(s) in further studies. Key words: disease resistance, Phomopsis longicolla, Phomopsis seed decay, soybean
Introduction Phomopsis seed decay (PSD) is one of the factors that most influences soybean (Glycine max) production because seed quality is directly reduced by increasing the number of moldy or split beans and decreasing its commercial grade by producing inferior meal and oil (Hepperly and Sinclair 1978; Sinclair 1999; Zhang et
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