Abstract:

The genetic diversity of 24 tomato varieties, which were bred by Xinjiang province or introduced from America, was analyzed by 44 SSR primers. The results showed that a total of 44 SSR primers performed polymorphism and 283 allele loci were detected. The average number of alleles per SSR locus was 4.422 with a range from 2 to17. The effective alleles were 189.638 with average 4.310. The value of allelic polymorphism information content ranged from 0.140 to 0.915, on an average of 0.662 per SSR marker. The average number of genotypic diversity was 1.438 with a range from 0.235 to 2.620. The genetic similarity of paired varieties ranged from 0.715 to 0.924 with average 0.820, and the genetic similarity of 95% tested materials ranged from 0.715 to 0.800. The results of UPGMA indicated that the 24 tomato varieties could be clustered into 4 groups. Based on the pedigree analysis, it was concluded that the tomato varieties in Xinjiang province had closer genetic relationships with each other and the genetic diversity was not enough at present. It is necessary to explore the genetic resources and enlarge the genetic background in order to increase the yield in current rice breeding.