Population structure and conservation genetics of wild rice Oryza rufipogon (Poaceae): a region-wide perspective from microsatellite variation

文献类型： 外文期刊

第一作者： Gao, LH

作者： Gao, LH

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关键词： conservation;microsatellite;population structure;wild rice;LIFE-HISTORY TRAITS;MATING SYSTEM;SATIVA L.;ECOTYPIC DIFFERENTIATION;FOREST FRAGMENTATION;NATURAL-POPULATIONS;ALLOZYME VARIATION;CULTIVATED RICE;EX WATT.;DIVERSITY

期刊名称：MOLECULAR ECOLOGY （ 影响因子：6.185； 五年影响因子：6.801 ）

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收录情况： SCI

摘要： Oryza rufipogon Griff. is the most agriculturally important but seriously endangered wild rice species. To better estimate how genetic structure can be used to obtained a conservation perspective of the species, genetic variability at six polymorphic microsatellite DNA loci was examined. High levels of genetic variability were detected at six loci in 1245 individuals of 47 natural populations covering most of the species' range in China (overall R-s = 3.0740, H-o = 0.2290, H-S = 0.6700). Partitioning of genetic variability (F-ST = 0.246) showed that most microsatellite variation was distributed within populations. Significant departures from Hardy-Weinberg expectations and very strong linkage disequilibrium indicate a high degree of inbreeding in the species and severe subdivision within populations. A mean Nm value of 0.7662 suggested a limited gene flow among the assayed populations. Our study suggests that conservation and restoration genetics should focus in particular on the maintenance of historically significant processes such as high levels of outbreeding and gene flow and large effective population size in the species.

分类号： Q7

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