夏大豆型遺傳資源의 特性에 關한 硏究(Ⅰ)

Studies on the Characteristics of Summer Type of Soybean Germplasms - Classification of Visual Characteristics of Land Races Collected in Kyong-Ki and Choong-nam areas and Japanese Varieties -

Two-hundred and ninty land races of summer type of soybeans collected throughout Kyong-ki and Choongnam areas in Korea and Japan were evaluated and classified for visual characteristics. Average number of days to initial flowering, fruiting, and maturity was 60, 66, and 126, and Changyoebkong was 74, 78, and 152 days, respectively. Average 126 days of maturity and 152 days was corresponded to 27 August and 22 September, respectively. Sixty-four lines were identified one month earlier in maturity than Changyoebkong. White flowered lines were 275, which was 95% of 290 lines. Summer type of soybeans showed shorter stem length, smaller number of main stem internodes, smaller air-dry weight of main stem and branches, and lower grain weight per plant than Changyoebkong. These indicates that summer type is generally lower yielding capacity. Average 100-grain weight was 27.3 gr. There were 18 lines ranged 12 to 15 gr. of 100-grain weight, and 28 lines ranged 32 to 35 gr. Eighty seven percent of lines showed yellow or whitish-yellow seed coat, 7.7% of lines had black coat. Yellow-saddle-patterned were 8 lines, and 7 lines were light green. Eighty-four percent of lines had dark brown hilum color. Average infection rate to pod and stem blight (Diaporthe phaseolorum) was 25%. Thirty eight lines showed infection rate of less-than 10%. Average infection rate to purple stain(Cercospora kikuchii) was 12.8%. No infectious lines to purple stain were identified, and lower infectious lines to purple stain showed high infection to pod and stem blight.