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Genetic diversity and differentiation of the endangered and endemic species Sauvagesia rhodoleuca in China as detected by ISSR analysis

Author(s): S.F. Chai1,2, Y.S. Jiang2, X.Y. Zhuang1, Y.C. Shi2, X. Wei2, W.H. Luo2 and Z.Y. Chen2

Sauvagesia rhodoleuca (Ochnaceae) is an endangered plant that is endemic to southern China. The levels of genetic variation and patterns of population structure in S. rhodoleuca were investigated using inter-simple sequence repeat markers. Eleven primers were used to amplify DNA samples from 117 individuals, and a total of 92 loci were detected. Our results indicated that genetic diversity was quite low both at the species level (percentage of polymorphic bands (PPB) = 41.30%, Nei’s gene diversity (h) = 0.1331, and Shannon information index (I) = 0.2028) and the population level (PPB = 16.30-28.26%, h = 0.0496-0.1012, and I = 0.0756-0.1508). A high level of genetic differentiation among populations was detected based on Nei’s genetic diversity analysis (0.4344) and analysis of molecular variance (47.03%).