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The Journal of Heredity 2001:92(6)
© 2001 The American Genetic Association 92:511-516

Brief Communication

High Levels of Genetic Differentiation of Oryza officinalis Wall. ex Watt. From China

L.-Z. Gao, S. Ge, and D.-Y. Hong

From the Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, P. R. China. The authors are sincerely grateful to Dr. Yi Zhou, Dr. Shou-zhou Zhang (Institute of Botany, Chinese Academy of Sciences), Prof. Qing-yan Luo, and Prof. Jiong-wei Zhang (Simao Prefecture Institute of Agricultural Sciences, Yunnan Province) for their help in collecting field materials; to Prof. Zhong-ren Wang, Prof. Kai-yu Pan, Dr. Shi-liang Zhou, and Miss Ke-qing Wang for their help with various aspects in our lab, and to Mr. Ru-sun Lin (Southern China Botanical Garden, Chinese Academy of Sciences, Guangzhou City), Prof. Zai-fu Xu, Prof. Guo-da Tao, Mr. Qing-juan Li, and Miss Yong-mei Xia (Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan Province) for their help in transplanting materials.

Address correspondence to Li-zhi Gao, Department of Genetics, University of Georgia, Life Sciences Building, Athens, GA 30602-7223, or e-mail: Lizhi_g{at}yahoo.com.

In order to determine the population genetic structure of wild rice (Oryza officinalis Wall. ex Watt.), an endangered tropical and subtropical species, allozyme diversity encoded by 24 loci was analyzed electrophoretically in 145 individuals of eight natural populations from Hainan, Guangxi, and Yunnan provinces, China. A fairly high genetic differentiation (FST = 0.882 and mean I = 0.786) was found among the studied populations. Our results suggest that restricted gene flow may play a significant role in shaping such a population genetic structure. In addition, high genetic differentiation among populations within a geographically limited region may stem from a reduced population size and consequent genetic drift.


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