Indica×Japonica 交雜에 있어서 米粒의 Alkali 崩壞性의 遺傳

Inheritance of Alkali Digestibility of Rice Grain in the Indica × Japonica Crosses

In order to investigate the inheritance of alkali digestibility of milled white rice in Indica x Japonica crosses, 2 Indica varieties (CP_(231)-SLO_(17) and BPI-76) and 4 Japonica varieties(Palkweng, Suwon 118, Norin 42, and Chianung 242) were crossed each other, and the milled white rice of parents, F₁s and F₂s were treated with 1.70% of potassium hydroxide solution at 30℃ for 18 hours long. The alkali digestibility of individual grains were numerically scored in accordance with a reading scale (Index) which divided into 7 grades. The results obtained were summarize das follows; 1) Low digestibility seemed to be dominant over high digestibility in Indica × Japonica crosses. 2) The distribution of alkali digestibility grade of F₂seeds in Indica × Japonica crosses were not continuous and segregated into 3 low and 1 high, and the results indicate that the alkali digestibility of milled white rice in Indica × Japonica crosses is controlled by a single gene. 3) The reciprocal effects of alkali digestibility was not detected both in F₁and F₂seeds.