Cross-species transferability of rice microsatellites in its wild relatives and the potential for conservation genetic studies

文献类型： 外文期刊

第一作者： Gao, LZ

作者： Gao, LZ;Zhang, CH;Jia, JZ

作者机构：

关键词： conservation genetics;cross-specific amplification;cultivated rice;Oryza;rice microsatellites

期刊名称：GENETIC RESOURCES AND CROP EVOLUTION （ 影响因子：1.524； 五年影响因子：1.713 ）

ISSN： 0925-9864

年卷期： 2005 年 52 卷 7 期

页码：

收录情况： SCI

摘要： Here, we investigated the transferability of 60 microsatellite markers characterized for cultivated rice Oryza sativa L. in three wild Oryza species representing different genome types: O. rufipogon Griff. (AA), O. officinalis Wall. et Watt. (CC), and O. granulate Nees et Arn. ex Watt. (G). The results indicate the 60 rice SSR loci tested produced homologous amplification products to different extents in O. rufipogon (100%), O. officinalis (90%) and O. granulata (73.3%). Proportions of polymorphism for successfully amplified loci ranged from 0.983 via 0.667 to 0.364 in O. rufipogon, O. officinalis and O. granulata, respectively. The utility of these microsatellite markers was tested for the characterization of genetic diversity in 1] 7 genotypes of these four Oryza species, The values of genetic diversity in cultivated rice are higher than the other two wild species O. officinalis and O. granulata, suggesting microsatellites tend to have more variability in the focal species than in non-focal species to which they are applied. However, much lower levels of genetic variation were observed in rice than in its wild progenitor O. rufipogon, which indicates severe loss of genetic variation may reflect the 'domestication bottleneck' through which rice passed, The observation that most of the rice microsatellites are able to detect allelic polymorphisms at different extent in 01 1,.,:a species suggest that rice microsatellite loci should be useful for the analysis of genetic diversity and inter- and intra-specific relationships in the genus. Therefore, high rates of successful cross-amplification of rice microsatellites among Oryza species with different genome types will offer excellent opportunities to investigate the population genetic structure of wild rice species and explore their conservation genetics.

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