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| Combining Ability Analysis of Cold-resistance Characteristic and Elite Combination Breeding in Cabbage（Brassica oleracea var. capitata L.） |
| ZHANG Yang-yong，JIN Zhe，FANG Zhi-yuan，LIU Yu-mei，YANG Li-mei，ZHUANG Mu，SUN Pei-tian |
| Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China |
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Abstract 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．
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Received: 24 March 2011
Published: 02 June 2011
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