水稻品種間交雜에 있어서의 稈長의 遺傳分離 3. Japonica x Indica 組合

The Segregation Mode of Plant Height in the Crosses of Rice Varieties. 3. Japonica x Indica crosses

The culm length segregation mode were studied in the single-cross F₂s, back-cross F₂s and top-cross F₂s of the hybrids between Japonica and semi-dwarf Indica rice varieties. 1. In the single-cross F₂ populations of the hybrids between Japonica and Indica, the culm length segregation showed complecate and non-alleic. 2. In the F₂ populations which back crossed or top crossed to the semi-dwarf Indicas, 3 different type of segregation mode were observed. They are homogeneous short, complecate and segregating into 3 tall and 1 short. 3. No maternal effects were observed in the culm length segregation. 4. For the productive plant type breeding in the hybrids between Japonicas and Indicas, the efficiency of the back-crosses and top-crosses to the semidwarf Indicas were discussed.