메밀 遺傳資源의 播種期에 대한 反應에 따른 生態型 分類

Ecotype classification by the response to planting season for genetic resources in buckwheat

Worldwide genetic resources of buckwheat have been collected and evaluated for their flowering, seed set, agronomic traits and grain yield at Suwon, Korea from 1988 to 1993. Most of South Korea landraces belonged to fall buckwheat, and flowered without matured seeds in spring planting. Thus the genetic resources were classified into two groups of summer and fall type buckwheats. In general, summer type buckwheats produced more grain yield than fall type buckwheat when planted in early spring. Fall type buckwheats produced grain only in mid or late July planting. The optimum planting season for summer type buckwheats was mid April resulting in doubling the grain yields of fall type buckwheats. The direct effects of flowering time, stem length and branch number on grain yield were positive, but the direct effects of emergence time, lodging and node number on grain yield were negative. Particularly, positive direct-effect of fertility degree of buckwheat plant on grain yield was the highest being 0.84 to 0.95, and demonstrating the greatest direct-effect for higher grain yield and with branch number per plant.