Ni Xian-Lin, Zhang Tao, Jiang Kai-Feng, Yang Li, Yang Qian-Hua, Cao Ying-Jiang, Wen Chun-Yang, Zheng Jia-Kui
Institute of Rice and Sorghum, Sichuan Academy of Agricultural Sciences, Deyang 618000, China.
Yi Chuan. 2009 Aug;31(8):849-54. doi: 10.3724/sp.j.1005.2009.00849.
Hybrid rice breeding is the combining ability breeding. Screening hybrid rice combinations with high special combining ability (SCA) is able to breed strong superiority combinations with practical values. In this study, the genetic distances (GD) of nine three-line hybrid rice (5 CMS lines and 4 restorer lines) were examined using SSR markers. Based on yield performances of 20 hybrid crosses (5 x 4 NCII), the relationships between SCA, heterosis and GD were studied. The correlations of yield SCA with the control heterosis (r1=0.5609) and the average heterosis (r2=0.541) were significant, but not significant with GD (r=0.2143). Thus, the heterosis can be reflected by SCA; the hybrid parents selected in this study can be used to develop strong superiority combinations; but the SCA cannot be reflected by GD, which needs further study.
杂交水稻育种是配合力育种。筛选具有高特殊配合力（SCA）的杂交水稻组合能够培育出具有实用价值的强优势组合。在本研究中，利用SSR标记检测了9个三系杂交水稻（5个不育系和4个恢复系）的遗传距离（GD）。基于20个杂交组合（5×4 NCII）的产量表现，研究了SCA、杂种优势与GD之间的关系。产量SCA与对照杂种优势（r1 = 0.5609）和平均杂种优势（r2 = 0.541）的相关性显著，但与GD的相关性不显著（r = 0.2143）。因此，杂种优势可以由SCA反映；本研究中选择的杂交亲本可用于培育强优势组合；但GD不能反映SCA，这需要进一步研究。
