SSR Analysis on Diversity of AA Genome Oryza Species in the Southeast and South Asia

Abstract

Abstract: To investigate genetic diversities among the AA genome Oryza species in the Southeast and South Asia, a total of 428 accessions of the AA genome Oryza species were genotyped using 36 simple sequence repeats (SSR) markers distributed throughout the rice genome. All of the 36 SSR markers generated polymorphic bands, revealing 100% polymorphism. The number of alleles per locus ranged from 3 to 17 with the mean of 8.6. The Nei’s genetic diversity index (He) ranged from 0.337 at RM455 to 0.865 at RM169 with an average value of 0.650. The genetic diversity of the AA genome Oryza species in the Southeast Asia was obviously higher than that in the South Asia. Among the detected Oryza species in the South and Southeast Asia, O. rufipogon showed the highest genetic diversity. Meanwhile, a higher genetic differentiation (Fst) was found among the detected Oryza species in the Southeast Asia than in the South Asia. The Fst value between O. nivara and O. sativa was the highest. The results from the number of specific alleles, specific loci, and allele frequency confirmed the greater genetic variation among the detected species. In addition, the specific allele in RM161 displayed higher frequency (0.193), suggesting its important function in identifying Oryza species of AA genome.

Key words: genome, Oryza species, simple sequence repeat, genetic diversity, South Asia, Southeast Asia

LU Jian-zhen, ZHANG Xiao-li, WANG Hai-gang, YUAN Xiao-ping, XU Qun, WANG Yi-ping, YU Han-yong, TANG Sheng-xiang, WEI Xing-hua. SSR Analysis on Diversity of AA Genome Oryza Species in the Southeast and South Asia[J]. RICE SCIENCE, 2008, 15(4): 289-294 .

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