关键词: 配合力, 杂交水稻, 农艺性状

Abstract: The combining ability for 12 characters in hybrid rice (O. sativa L. subsp. sinica) was studied in a 7×5 diallele including 7 CMS lines (A lines) with different cytoplasms and 5 restorer lines (R lines). Most of the characters of sinica type hybrid rice were affected by the GCA effects of A and R lines and the SCA effects of the combinations. Number of panicles per plant, however, was mainly affected by GCA effects of A lines, and grain yield and biomass per plant were unaffected by GCA effects of R lines. The GCA effects of A and R lines played a more important role than their SCA effects, and for the GCA effects the A lines were more important than the R lines. So it was considered that more attention should be devoted to developing A lines. and the diversity of R lines must also be considered in the breeding of sinica rice hybrids, The parents were evaluated on their comprehensive expression of combining abilities of the main economic characters.The A lines of Liu-Qian-Xin A (BT type) and Nan-Jing 34 A (D type) and the R lines of Ning- Hui 3-2 and 77302-1 were recommended as better parents. The better combinations of Liu-Qian-Xin A/77302-1, Liu-Qian-Xin A/Ning-tui 3-2, Nan-Jing 34 A/77302-1 and Nan-Jing 34 A/Ning-Hui 3-2 were also identified. These results, which coincided with current hybrid breeding practices, verified the significance of combining ability in heterosis breeding.

Key words: Combining ability, Hybrid rice, Agronomic character