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选用 9个不同类型的水稻品种 (系 ) ,按双列杂交设计 ( 6× 5 )配成两套亲本和F12个世代的遗传材料 .采用数量性状的加性 显性遗传模型、发育遗传模型比较分析了水稻谷粒重发育的杂种优势和遗传相关性 .结果表明 ,早季在谷粒充实前期 ( 1～ 12d)群体平均优势较小 ,中后期 ( 13～ 2 8d)正向优势趋于明显 ,在谷粒充实的全过程均表现较小的负向群体超亲优势 ;晚季则在谷粒充实前中期 ( 1～ 18d)表现正向群体平均优势 ,后期 ( 19～ 2 8d)优势不明显 ,在谷粒充实前期 ( 1～ 12d)表现正向群体超亲优势 ,之后转为明显的负向群体超亲优势 ,表明晚季谷粒发育的杂种优势表现较之早季更有利于提高籽粒充实质量 .不同发育时期谷粒重之间以及与最终谷粒重之间的遗传相关分析表明 ,早季以显性相关为主 ,晚季以加性相关为主 ,随着发育进程的推进 ,相关趋于密切
Nine different types of rice cultivars (lines) were selected and their genetic materials were dubbed into two sets of parents and F12 generations according to the double crosses design (6 × 5) .Adopting the additive dominant gene quantitative trait model, The heterosis and genetic correlation of grain weight development in rice were analyzed.The results showed that the average superiority of population in early grain filling stage was lower in early grain filling stage (1 ~ 12 days), the positive predominance in late grain filling stage (13 ~ 28 days) , Showed a smaller negative group super-pro-dominant in the whole process of grain enrichment. In late-season, the positive group averaged in the middle and early grain filling stages (1 ~ 18d), and the advantage in late stage (19 ~ 28d) Obviously, in the first grain filling stage (1 ~ 12d), the positive group showed super-pro superiority, and then changed to obvious negative group super-pro-dominant, which indicated that heterosis of late grain development was more beneficial than the early season The grain filling quality.The genetic correlation analysis between the grain weight and the final grain weight at different developmental stages showed that the dominant is the dominant correlation in the early season and mainly the additive correlation in the late season.With the progress of the development , The relevant tends to be close