콩 RIL 집단의 내탈립성 변이 탐색 및 유망계통 선발

Variation in Pod Shattering in a RIL Population and Selection for Pod Shattering Tolerance in Soybean [Glycine max (L.) Merr]

Pod shattering during the maturing stage causes a serious yield loss in soybean. It is the main limiting factor of soybean cultivation and mechanization. It is important to develop varieties suitable for mechanical harvesting and to develop energy-efficient agricultural machinery to save labor and costs. ‘Daewonkong,’ developed by the National Institute of Crop Science (NICS) in 1997, is an elite cultivar that occupies more than 80% of the soybean cultivation area in Korea because of its strong tolerance to pod shattering. The objectives of this study were to investigate the variation in pod shattering degree in a RIL population developed from a ‘Daewonkong’ parent and to select promising lines with pod shattering tolerance. ‘Daewonkong’ demonstrated a high level of tolerance to pod shattering compared to the ‘Tawonkong’ and ‘Saeolkong’ varieties, with no shattered pods after 72 hours of drying. Screening of pod shattering showed a clear distinction between the tolerant and susceptible varieties. Also, the distribution of shattering pod ratio in the two populations showed a similar pattern for three years. The promising lines with pod shattering tolerance included 27 lines in the ‘Daewonkong’בTawonkong’ population and 21 lines in the ‘Daewon-kong’בSaeolkong’ population. The promising lines are expected to be widely used as breeding parents for creating soybean cultivars with pod shattering tolerance.