杂交稻特殊配合力与杂种优势、亲本间遗传距离的相 关性

doi:10.3724/SP.J.1005.2009.00849

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HEREDITAS ›› 2009, Vol. 31 ›› Issue (8): 849-854.doi: 10.3724/SP.J.1005.2009.00849

Correlations between specific combining ability, heterosis and genetic distance in hybrid rice

NI Xian-Lin^{1, 2};ZHANG Tao^{1, 3};JIANG Kai-Feng^{1, 3};YANG Li^{1, 3};YANG Qian-Hua^{1, 3};CAO YING-Jiang¹;WEN Chun-Yang²;ZHENG Jia-Kui^{1, 2,3}

1. Institute of Rice and Sorghum, Sichuan Academy of Agricultural Sciences, Deyang 618000, China;
2. College of Bioengineering, Chongqing University, Chongqing 400044, China;
3. Luzhou Branch of National Rice Improvement Center, Luzhou 646100, China

Received:2008-12-29 Revised:2009-04-09 Online:2009-08-10 Published:2009-08-10
Contact: ZHENG Jia-Kui1

Abstract

Abstract: 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 (5×4 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.

Key words: rice, specific combining ability, genetic distance, heterosis, correlation

NI Xian-Lin, ZHANG Tao, JIANG Kai-Feng, YANG Li, YANG Qian-Hua, CAO YING-Jiang, WEN Chun-Yang, ZHENG Jia-Kui. Correlations between specific combining ability, heterosis and genetic distance in hybrid rice[J]. HEREDITAS, 2009, 31(8): 849-854.

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Correlations between specific combining ability, heterosis and genetic distance in hybrid rice

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