Introgression from cultivated rice alters genetic structures of wild relative populations: implications for in situ conservation

文献类型： 外文期刊

第一作者： Jin, Xin

作者： Jin, Xin;Liu, Ping;Cai, Xingxing;Lu, Bao-Rong;Chen, Yu;Li, Chen;Rong, Jun;Lu, Bao-Rong;Rong, Jun;Lu, Bao-Rong

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关键词： Crop wild relatives; gene flow; genetic relationship; molecular genotyping; natural hybridization; Oryza rufipogon

期刊名称：AOB PLANTS （ 影响因子：3.276； 五年影响因子：3.496 ）

ISSN： 2041-2851

年卷期： 2018 年 10 卷 1 期

页码：

收录情况： SCI

摘要： Maintaining genetic integrity is essential for in situ and ex situ conservation of crop wild relative (CWR) species. However, introgression of crop alleles into CWR species/populations may change their genetic structure and diversity, resulting in more invasive weeds or, in contrast, the extinction of endangered populations. To determine crop-wild introgression and its consequences, we examined the genetic structure and diversity of six wild rice (Oryza rufipogon) populations under in situ conservation in China. Thirty-four simple sequence repeat (SSR) and 34 insertion/deletion markers were used to genotype the wild rice populations and two sets of rice cultivars (O. sativa), corresponding to the two types of molecular markers. Shared alleles and STRUCTURE analyses suggested a variable level of crop-wild introgression and admixture. Principal coordinates and cluster analyses indicated differentiation of wild rice populations, which was associated with the spatial distances to cultivated rice fields. The level of overall genetic diversity was comparable between wild rice populations and rice cultivars, but a great number of wild-specific alleles was detected in the wild populations. We conclude based on the results that crop-wild introgression can considerably alter the pattern of genetic structure and relationships of CWR populations. Appropriate measures should be taken for effective in situ conservation of CWR species under the scenario of crop-wild introgression.

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