Introgression from cultivated rice alters genetic structures of wild relative populations: implications for in situ conservation.
Introgression from cultivated rice alters genetic structures of wild relative populations: implications for in situ conservation.
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栽培稻的基因渗入改变了野生近缘种群的遗传结构：对就地保护的影响。
DOI：
10.1093/aobpla/plx055
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发表时间：
2018-03
期刊：
影响因子：
2.9
通讯作者：
Lu BR
中科院分区：
文献类型：
--
作者：
Jin X;Chen Y;Liu P;Li C;Cai X;Rong J;Lu BR
我们发现基因从栽培稻渗入其原位保守的野生近缘种群，这极大地改变了它们的遗传结构和关系。基因渗入的水平与野生种群与栽培稻田的空间距离有关。这些发现基于使用两种分子标记对六个野生种群和两组水稻品种进行的遗传分析。作物野生基因渗入改变了野生种群的遗传完整性。因此，应采取适当措施对农作物品种野生近缘种进行有效的就地保护。保持遗传完整性对于作物野生近缘种 (CWR) 物种的就地和异地保护至关重要。然而，作物等位基因渗入 CWR 物种/种群可能会改变其遗传结构和多样性，导致更具入侵性的杂草，或者相反，导致濒危种群的灭绝。为了确定作物野生基因渗入及其后果，我们研究了中国就地保护下的六个野生稻（Oryza rufipogon）种群的遗传结构和多样性。 34个简单序列重复（SSR）和34个插入/缺失标记用于对野生稻群体和两组水稻品种（O. sativa）进行基因分型，对应于两种类型的分子标记。共享等位基因和结构分析表明作物野生基因渗入和混合水平存在差异。主坐标和聚类分析表明野生稻种群的分化，这与距栽培稻田的空间距离有关。野生稻种群和水稻品种之间的总体遗传多样性水平相当，但在野生种群中检测到大量野生特异性等位基因。根据结果我们得出结论，作物野生基因渗入可以显着改变 CWR 种群的遗传结构和关系模式。在作物野生入侵的情况下，应采取适当的措施对CWR物种进行有效的就地保护。
We found gene introgression from cultivated rice to its in situ conserved wild relative populations, which has considerably altered their genetic structure and relationship. The level of introgression is associated with the spatial distances of the wild populations from cultivated rice fields. The findings are based on genetic analyses of six wild populations and two sets of rice cultivars using two types of molecular markers. Crop-wild introgression alters the genetic integrity of wild populations. Thus, appropriate measures should be taken for effective in situ conservation of wild relatives of crop cultivars. 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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