不结球白菜株高性状主基因＋多基因遗传分析

Genetic analysis of plant height using mixed major gene plus polygenes inheritance model in non-heading Chinese cabbage

应用主基因+多基因6个世代联合分离分析方法对不结球白菜SI×秋017组合的株高性状进行了分析。结果表明,SI×秋017组合的株高性状遗传受1对负向完全显性主基因+加性-显性多基因控制,主基因加性效应为5.79;多基因加性效应为-7.85,多基因显性效应为14.95;B1、B2和F2世代株高的主基因遗传率分别为33.28%、37.05%和51.68%;多基因遗传率分别为5.84%、12.67%和1.34%,说明F2世代株高表现出较高的主基因遗传率,并受环境影响。对SI×秋017组合株高性状的改良要以主基因为主,同时注意环境的影响。

The mixed major-gene plus polygene inheritance model was used to analyze the inheritance of plant height in the non-heading Chinese cabbage （Brassica campestris ssp. chinensis Makino） cross between SI and Qiu 017. The results showed that the plant height was controlled by one completely negative complete dominant major-gene plus additive-dominant polygenes. The additive effect for major-gene was 5. 79, the additive and dominant effect for polygenes were -7. 85 and 14. 95, respectively. The major-gene heritabilities in Bl , B2 and F2 were 33. 28%, 37. 05% and 51.68%, respectively, and the corresponding polygenic heritabilities were 5.84% , 12. 67% and 1.34% , respectively. These results indicated that major gene in F2 was a key factor and environment factor was also relatively important. This implies that in the genetic improvement of plant-height major-gene is a main factor whereas environmental effect should be taken care of.