水稻 品種間 交雜에 交雜에 있어서 稈長의 稈長의 遺傳分離 Ⅶ. 劣性稈長 特性의 遺傳分離

The Segregation Mode of Plant Height in the Crosses of Rice Cultivars Ⅶ. Segregation of Recessive-tall Culm Length

A rice genetic stock “Davis 80”, which has recessive tall uppermost internode designated as eui, was crossed with 2 Tongil Type semi-dwarf cultivar ωχ 817 and Nampung, one semi-dwarf Japonica Reimei, 2 tall Japonica Han #7 and Jinheung, and the culm length and the internode lengths were tested for their parents, F₁s and F₂S. The results are summarized as follows ; 1. The culm length of F₁ plants of Nampung cross was same as short parent Nam.pung, and in the rest combinations the culm length of F₁s were in between short and tall parents. 2. For the culm length of F₂s, in the crosses of Davis 80/ωχ 817, Davis 80/ Nampung and Davis 80/ Reimei, short and tall segregated in to 3 to 1 ratio. But the mode of the short and the tall group were significantly taller than their short and tall parents. In the crosses of Davis 80/Han #7 and Davis 80/Jinheung the segregation mode was typical non-allelic one. 3. For the first internode length of F₂s, in the crosses of Davis 80/Reimei and Davis 80/Jinheung showed 3:1 ratio segregation for short and long. In the rest combinations, the segregation modes were non-allelic. 4. The correlation coefficients between culm length and each internode length were significant. Especially, for those of 1st, 3rd and 4th were highly significant. 5. The correlation coefficients between culm length and heading time, panicle length, panicle exsertion and thickness of panicle neck were significant. The correlation cofficients between culm length and heading time were negative in the early F₂ populations and positive in the late F₂ populations.