手稻高蛋白 突然變異系統과 母品種과의 交雜에 있어서 多發性遺傳因子의 發現에 關한 硏究

Manifestation in F₂ of Pleiotropic Gene in the Cross between Mother Variety and its High Protein Mutant

High protein rice mutant (M₁₂ plant generation in 1976) was obtained from the progeny of X-rayed Hokwang variety. Besides high protein, the mutant accompanied two other mutated characters of reduced culm length and earlier heading date. Crossing between the mutant and its mother variety was made (1) to examine the gene(s) controlling high protein, (2) to verify the pleiotropic (or linkage) relation among the three changed characters and (3) to test the possibility of intro-ducing the high protein gene(s) into mother variety. The assumption that a single pleiotropic recessive gene might be responsible for the three mutated characters was evidenced in F₂ by the segregation of mother and mutant types in the ratio of 3 : 1. Besides these parental types there were numbers of segregant groups in F₂. Among them were types which were mother-like phenoty-pically but had as high protein content as the mutant. These segregants were placed under further experiment for the confirmation of the character manifestation or fixation in later generations.