结球甘蓝抗寒性配合力分析及优良抗寒组合选育

通过自交分离和抗寒性鉴定，选育出经济性状优良的结球甘蓝抗寒自交系逾30份，以其中6份抗寒性有一定差异的自交系为试材，按照Griffing双列杂交方法Ⅳ进行甘蓝抗寒性配合力及遗传力分析。结果表明：甘蓝抗寒性遗传符合加性-显性模型，以加性效应为主，随着寒害程度的增加其加性效应所占比重增加|一般配合力方差在总遗传方差中所占比重较大，一般配合力/特殊配合力的均方比大于7，且差异达极显著水平，因此在甘蓝抗寒育种中应重视早期世代的选择。结合配合力测定结果及田间经济性状调查结果，初步明确两个优良抗寒越冬甘蓝新组合。

Combining Ability Analysis of Cold-resistance Characteristic and Elite Combination Breeding in Cabbage(Brassica oleracea var.capitata L.)

By segregated population selection and cold-resistance identification，over 30 elite inbred lines were developed in cabbage（Brassica oleracea var. capitata L.）．Using Griffing Ⅳ method，cabbage combining ability and heritability of cold-resistance characteristic were analyzed，taking 6 inbred lines with different cold-resistance as testing materials．The results showed that the characteristic of cold-resistance was controlled by additive effect and non-additive effect，but mainly by additive effect．The percentage of additive effect increased with the decrease of low temperature．GCA（general combining ability）variance accounted for a large proportion in the total genetic variance，and the mean square ratio of GCA and SCA was greater than 7，which also had significant difference at 1 % level．For cold-resistant breeding，early generation selection should be emphasized．With the results of combining ability analysis and investigation of other economic characteristics，two elite cold-resistant combinations were confirmed．