Dormancy indexes of hulled and dehulled seeds were investigated by using 109 F1 hybrids and their 19 cytoplasmic male sterile(CMS) lines and 9 restorer lines in indica hybrid rice. The seeds of each F1 and the parents were harvested at 35 days after flowering. Meanwhile, combining ability was analyzed in 25 combinations made by 5 CMS lines and 5 restorer lines (NCⅡ genetic design). The results showed that the seed dormancy index of F1 was positively and highly significantly correlated with those of their parents and midparent value. Out of the 109 combinations, 82 showed midparent heterosis, and 43 heterobeltiosis. Seed dormancy index of F1 and their parents declined dramatically in dehulled seeds compared with hulled seeds, indicating that the hull played an important role in seed dormancy. However, the trend was similar in hulled and dehulled seeds in terms of relationship between F1 and their parents in seed dormancy. The influence of hull on seed dormancy depended mainly on F1 genotype, not on hull itself of maternal parent. The variance of general combining ability(GCA) in female and male parents occupied 592% and 31.1% of total variance, respectively. The variance of specific combining ability(SCA) in combinations occupied 97% of total variance, indicating that gene additive effects were principal. Among the 5 CMS lines, Ⅱ112A had the highest GCA effect for seed dormancy, followed by D62A. Among the 5 restorer lines, IR112 had the highest GCA effect for seed dormancy followed by 2786. They were excellent materials as parents for breeding F1 hybrid rice with stronger seed dormancy.
XU Baoqin,LU Zuomei. Correlation Between Parents and F1 and Combining Ability of Parents in Seed Dormancy for indica Hybrid Rice[J]. , 2008, 22(6): 583-583～589 .
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