Chinese Journal of Rice Science

• 研究简报 • Previous Articles     Next Articles

The Heterosis and Combining Ability for the Days to Heading of the

Sun Yiwei; Li Jiqing; Liu Yibo

  

  • Received:1900-01-01 Revised:1900-01-01 Online:1993-04-10 Published:1993-04-10

两系亚种间杂交水稻抽穗日数的杂种优势和配合力分析

孙义伟1,2;李继庆3;刘宜柏2   

  1. 1 江西农业大学,南昌330045;2 上海市长江农场,崇明202178;3 江西省萍乡市计划委员会,萍乡337001

Abstract: A partial diallel cross including 5 photosensitive genic male-sterile rice (PGMSR) lines as female parents and 10 wide compatibility (WC) varieties as male parents was made to study the heterosis and combining ability for the days to heading (DTH) of the F1 hybrids. The result showed that 5460S and Hengnong S-1 had better general combining ability (GCA), their F1 showed no heterosis; W6154S, W6184S and KS-9 had worse GCA, their F1 exhibited a significant positive heterobeltiosis, suggesting the difference in the DTH of F1 among parents and among combinations. The GCA of parents, especially the indica parents, played a more important role in controlling the DTH of F1s. The combining ability of a parent is related to its breeding relationship and the parent derived from the southeast Asia variety has better GCA. The relation between GCA and the photosensitivity gene was discussed.

Key words: heterosis, hybrid rice, combining ability, heading date, intersubspecies hybrid

关键词: 杂种优势, 杂交水稻, 配合力, 抽穗期, 亚种间杂交稻