关键词: 结球甘蓝, 耐裂球, 主基因+ 多基因, 遗传分析

Abstract: Six generations（P1，P2，F1，B1，B2 and F2）derived from the cabbage parents of‘79-156’ and‘96-100’were used to investigate the inheritance of head-splitting resistance trait in cabbage（Brassica oleracea L.var. capitata L.）by using mixed major gene plus polygene inheritance modle. The results showed that the head-splitting resistance trait was controlled by two additive-dominant-epitasis major genes plus additive-dominant-epitasis polygenes（E-0 model）in the joint analysis of the six generations. At the same time，the additive effect for the two major genes was foremost while there was some interaction effect between them. In 2010，the major genes，heritability of B1，B2 and F2 were estimated to be 67.3%， 1.4% and 59.1%，respectively，the heritability of polygenes were 0，56.2% and 0，the variance of the environment and genes variance accounted for 39.1% and 60.9% of the phenotypic variance in each population respectively. In 2011，the major genes，heritability of B1，B2 and F2 were estimated to be 85.5%，22.3% and 84% while the heritability of polygenes were 0，24.3% and 0，the variance of environment and genes accounted for 39.1% and 60.9% of the phenotypic variance in each population individually. It indicated that the trait of resistance to head-splitting in cabbage was dominated by major genes although the environmental factors had a great effect on it. In practical breeding，higher hereditability of major genes can be favorable to an efficient selection in early generation of F2 and B1 for resistance to head-splitting in cabbage .

Key words: cabbage, resistance to head-splitting, major gene plus polygene, genetic analysis