Increases in Genetic Diversity of Weedy Rice Associated with Ambient Temperatures and Limited Gene Flow

文献类型： 外文期刊

第一作者： Kong, Hua

作者： Kong, Hua;Guo, Jing-Yuan;Xia, Qi-Yu;Zhao, Hui;Zhang, Yu-Liang;Guo, An-Ping;Wang, Zhi;Lu, Bao-Rong

作者机构：

关键词： gene flow; genetic divergence; increased diversity; temperature effect; temporal isolation; weed

期刊名称：BIOLOGY-BASEL （ 影响因子：5.079； ）

ISSN：

年卷期： 2021 年 10 卷 2 期

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收录情况： SCI

摘要： Hypotheses regarding the association of increased species or genetic diversity with gradually warmer regions as a global pattern have been proposed, but no direct and solid experimental data are available to approve the association between plant genetic diversity and ambient temperatures. To test the diversity-temperature hypothesis, we studied genetic diversity and genetic differentiation of weedy rice (Oryza sativa f. spontanea) populations occurring naturally in early- and late-season rice fields that share nearly the same ecological conditions but with slightly different temperatures. Data collected from 10-year historical climatic records indicated a similar to 2 degrees C higher average air temperature in the late rice-cultivation seasons than in the early seasons. Results based on molecular fingerprints of 27 SSR (simple sequence repeat) loci showed a higher level of genetic diversity in the late-season weedy rice populations than in the early-season populations. In addition, a positive correlation was detected between the increased proportion of genetic diversity (Delta H-e) and genetic differentiation among the weedy rice populations, suggesting limited gene flow. Therefore, we conclude from this study that increased genetic diversity in the late-season weedy rice populations is probably caused by the higher ambient temperatures. This finding provides evidence for the possible association between genetic diversity and ambient temperatures.

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