Allozyme variation and population genetic structure of common wild rice Oryza rufipogon Griff. in China

被引:55
作者
Gao, LZ [1 ]
Hong, SGDY [1 ]
机构
[1] Chinese Acad Sci, Inst Bot, Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China
关键词
China; conservation management; genetic diversity; O; rufipogon; population genetic structure;
D O I
10.1007/s001220051508
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
In order to determine the genetic diversity and genetic structure of populations in common wild rice Oryza rufipogon, an endangered species, allozyme diversity was analyzed using 22 loci in 607 individuals of 21 natural populations from the Guangxi, Guangdong, Hainan, Yunnan, Hunan, Jiangxi and Fujian provinces in China. The populations studied showed a moderate allozyme variability (A=1.33, P=22.7%, Ho=0.033 and He=0.068), which was relatively high for the genus Oryza The levels of genetic diversity for Guangxi and Guangdong were significantly higher than those for the other regions, and thus South China appeared to be the center of genetic diversity of O. rufipogon in China. A moderate genetic differentiation (F-ST=0.310, I=0.964) was found among the populations studied. Interestingly the pattern of population differentiation does not correspond to geographic distance. An estimate of the outcrossing rate (t=0.324) suggests that the species has a typical mixed-mating system. The deficit of heterozygotes (F=0.511) indicates that some inbreeding may have taken place in outcrossing asexual populations because of intra-clone outcrossing events and "isolation by distance" as a result of human disturbance. In order to predict the long-term genetic survival of fragmented populations, further studies on gene flow among the remaining populations and the genetic effects of fragmentation are proposed. Finally, some implications for the conservation of endangered species are suggested.
引用
收藏
页码:494 / 502
页数:9
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