Enhanced genetic diversity of weedy rice populations associated with latitude decreases revealed by simple sequence repeat fingerprints
Enhanced genetic diversity of weedy rice populations associated with latitude decreases revealed by simple sequence repeat fingerprints
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简单序列重复指纹揭示与纬度降低相关的杂草稻种群遗传多样性增强
DOI：
10.1111/jse.12428
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发表时间：
2019
影响因子：
3.7
通讯作者：
Lu Bao-Rong
中科院分区：
文献类型：
--
作者：
Wang Zhe;Fu Min-Jie;Zhu Hai-Ge;Zhu Yue;Zhao Xiang-Xiang;Lu Bao-Rong
杂草稻（Oryza sativa L.）F.密地松（spontanea）是一种有害的农业杂草，在世界范围内危害稻田并造成栽培稻的巨大产量损失。然而，除了其遗传分化的原因外，对WR种群在宽纬度梯度上的分布与遗传多样性之间的关系知之甚少。为了确定遗传多样性和分化的分布，我们基于20个简单重复序列位点分析了从中国东北、江苏和广东省以及斯里兰卡的广泛地理范围的水稻种植区收集的20个WR群体。结果表明，WR种群的遗传多样性与纬度分布呈显著负相关（R = 0.84，P < 0.01）。Mantel检验（R2 = 0.49，P < 0.01）显示来自不同水稻种植区的WR群体有不同的分组，符合距离隔离模式。此外，结构分析和主坐标分析表明，不同稻作区水稻品种间存在较大的遗传分化，这与共现品种类型有关。根据以上结果，我们得出结论，WR遗传多样性受WR种群所在纬度的影响。WR群体的遗传分化主要由其空间距离和共现品种决定。不同地区的遗传多样性和分化的这种模式可能有助于设计有效的WR控制，除了了解这种杂草的适应性进化。
Weedy rice (WR, Oryza sativa L. f. spontanea) is a noxious agricultural weed, infesting rice fields worldwide and causing tremendous yield losses of cultivated rice. However, little is known about the relationship between genetic diversity and distribution of WR populations across a wide latitudinal gradient, in addition to its reasons for genetic differentiation. To determine the distribution of genetic diversity and differentiation, we analyzed 20 WR populations collected from wide geographic ranges of rice‐planting regions across Northeast, Jiangsu, and Guangdong provinces of China, and Sri Lanka, based on 20 simple sequence repeat loci. Our results indicated a significant negative correlation (R = 0.84, P < 0.01) between genetic diversity and latitudinal locations of WR populations. The Mantel test (R2 = 0.49, P < 0.01) showed distinct groupings of WR populations from different rice‐planting regions, fitting an isolation‐by‐distance pattern. In addition, the STRUCTURE analysis and principal coordinates (PCoA) analysis indicated considerable genetic differentiation of WR from different rice‐planting regions, which was associated with the types of co‐occurring rice cultivars. We conclude, based on the above results, that WR genetic diversity is affected by the latitudes where WR populations are located. The genetic differentiation of WR populations is determined by their spatial distances and co‐occurring rice cultivars. Such a pattern of genetic diversity and differentiation across different regions might facilitate the design of effective WR control, in addition to understanding the adaptive evolution of this weed.