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[Genetic diversity of common wild rice (Oryza rufipogon Griff) by using SSR markers and phenotypic traits in Guangxi Province].

In this paper, allelic variation and genetic diversity among geographies and growth habit types were studied by using 223 accessions of common wild rice primary core collection in Guangxi Province, with 34 SSR primers locating on 12 chromosomes of rice and 19 phenotypic traits. In the results, 24.91 alleles were detected per locus on average with a range from 7 to 48. Compared to the cultivated rice, the wild rice showed more allelic variations. The ratio of heterozygote of SSR locus was 32.01% on average, and it's range was 1.35% 81.31%. The frequency of heterozygote of SSR locus in Oryza rufipogon Griff was much higher than in Oryza sativa L. The geographical distribution of genetic diversity measured by SSR markers was not completely accordant with that by phenotypic traits. At DNA level, more wild rice individuals and higher genetic diversity were included within the area covering north latitude 22 degrees - 23 degrees and 23 degrees - 24 degrees (comprising Longan, Fusui, Yongning, Xiangzhou, Laibin, Xuanwu, Yulin and Guigang county), which formed the center of genetic diversity. But the center of genetic diversity at the phenotypic level located within north latitude 21 degrees - 22 degrees and 22 degrees - 23 degrees. Among the four growth habit types, the genetic diversity from high to low was found respectively in prostrate type, sloping type, slighting type, and erect type at both DNA and phenotypic levels.