水稻 脫粒性의 檢定方法과 遺傳變異

Testing method and inheritance of the grain shattering in rice(oryza sativa L.)

The ratio of grain shattering by hitting method exhibited a good correlation with other measuring methods and also, this hitting method the least standard deviation within variety while the coefficient of variation was greater between varieties. Therefore, this method could possible be used for expressing the degree of grain shattering by quantitatively. The grain shattering could be effectively satisfied by measuring one panicle per hill and 15 hills per variety, respectively. For the 8 varieties, the degree of grain shattering was differed significantly depending upon the ripening stage exhibiting higher value after 50 days after heading. Generally, non-shattering was partially dominated to easy-shattering in F₂ and F₃ generations of three crosses, Japonica type/Tongil type. While opposite result was recorded in Milyang 20/IR 38 cross. It was ooncluded that the grain shattering was governed by polygene(at least more than two genes) and the selection efficiency for grain shattering was significant showing clear frequency distribution in F₃ generation of four crosses.