《Table 1 Genetic distance between Kangxian series cultivars》

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《黑龙江省抗胞囊线虫大豆的分子遗传和相关基因挖掘（英文）》

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Kangxian 2 which was developed by Heilongjiang A-cademy of Agricultural Sciences is an indeterminate line with high resistance to race 3 SCN，high yield，resistances to drought and salt，and widely planted in the areas of Heilongjiang province suffered from sandstorm，drought and salt.The genes responsible for resistance to SCN race 3 in Kangxian 2 were from Franklin.Cluster analysis of Kangxian 2 and its derived lines（Fig.1）showed that Kangxian 2 had a close genetic relationship with Kangxian 10 and Kangxian 6，and with genetic distances of 0.213 and 0.24，respectively.Kangxian 2 was genetically distant from Fengdou 3，and their genetic distance was 0.799.Kangxian 10 and Kangxian 6，which were genetically close to Kangxian2，still had the resistance to SCN.However，Kangxian10 was a semi-determinate line，and Kangxian 6 had increased oil content，but was susceptible to leaf spot.Kangxian 8 and Kangxian 9 had similar genetic basis，and their genetic distance was 0.064.Kangxian 8 was moderately resistant to SCN race 3，and Kangxian 9was susceptible to root rot，and the leaf photosynthetic capacity of the former was lower than that of the latter.Kangxian 2 was genetically distant from Fengdou 3 and Kangxian 11，and the genetic distances were 0.799and 0.554 respectively，indicating that Fengdou 3 had abundant genetic basis（Table 1）and thus could be used for genetic improvement in soybean breeding.Fengdou 3 was genetically distant from all the tested cultivars，especially the genetic distance between Fengdou 3 and Kangxian 8 was up to 0.921.