Patterns of Allozyme Variation at Two Stages of the Life History in Wild Rice <Emphasis Type="Italic">Oryza rufipogon</Emphasis> and Conservation Genetic Implications |
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Authors: | Email author" target="_blank">L?Z?GaoEmail author D?Y?Hong S?Ge |
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Institution: | (1) Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, P. R. China;(2) School of Public Health, Human Genetics Center, University of Texas Health Science Center at Houston, 1200 Hermann Pressler, Houston, TX 77030, USA |
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Abstract: | Oryza rufipogon Griff. occurs widely in aquatic ecosystem of tropics and subtropics of monsoon Asia as well as Southern China. It is a vital
gene source for rice breeding programs. Many populations of the species, unfortunately, have drastically diminished because
of the disappearance of aquatic habitats as a result of human disturbance. In order to determine patterns of genetic variation
at two stages of the life-cycle in the wild rice species, we investigated allozyme variation of four natural populations in
China. Two southern populations have significant asexual reproduction while two other northern marginal populations show a
mixed reproduction in China. At 22 allozyme loci, a significantly lower genetic diversity was observed in the ratoons than
in the seeds of the two southern populations, whereas a significantly higher genetic diversity was found in the ratoons than
in the seeds of the two northern marginal populations. The results suggest that the variation of reproductive system is probably
associated with their patterns of genetic variation in the species. Moreover, a significantly higher genetic differentiation
among populations found in the ratoons than in the seeds may stem from pollen-mediated gene flow among them. Finally, we propose
suggestions for conservation management of the endangered species. |
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Keywords: | Allozyme analysis Conservation implications Genetic diversity Life history Oryza rufipogon Griff Population genetic structure |
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