Increases in Genetic Diversity of Weedy Rice Associated with Ambient Temperatures and Limited Gene Flow.
Increases in Genetic Diversity of Weedy Rice Associated with Ambient Temperatures and Limited Gene Flow.
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杂草稻遗传多样性的增加与环境温度和有限的基因流有关
DOI：
10.3390/biology10020071
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发表时间：
2021-01-20
期刊：
影响因子：
4.2
通讯作者：
Lu BR
中科院分区：
文献类型：
--
作者：
Kong H;Wang Z;Guo JY;Xia QY;Zhao H;Zhang YL;Guo AP;Lu BR
植物遗传多样性的增加可能与更高的环境温度有关。为了验证这一假设，我们研究了中国南方雷州早、晚稻稻田杂草稻群体的遗传多样性和分化。从10年的气候记录中收集的数据显示，晚稻栽培季节的平均温度高于早稻栽培季节。结果表明，晚季杂草稻群体具有较大的遗传多样性，早、晚季杂草稻群体间存在较大的遗传分化。因此，较高的环境温度可能是促进晚季杂草稻群体遗传多样性形成的重要因素。摘要物种或遗传多样性的增加与逐渐变暖的地区之间的关系是一种全球模式，但目前还没有直接和可靠的实验数据来证实植物遗传多样性与环境温度之间的关系。为了验证多样性-温度假说，我们研究了杂草稻的遗传多样性和遗传分化。在早、晚季稻田中自然发生的两个种群，生态条件几乎相同，但温度略有不同。从10年历史气候记录中收集的数据表明，晚稻栽培季节的平均气温比早稻栽培季节高约2 °C。结果表明，晚季杂草稻群体的遗传多样性水平高于早季杂草稻群体。此外，杂草稻群体间遗传多样性比例（ΔHe）的增加与遗传分化呈正相关，表明杂草稻群体间的基因流动有限。因此，我们认为晚季杂草稻群体遗传多样性的增加可能是由较高的环境温度引起的。这一发现为遗传多样性和环境温度之间可能存在的联系提供了证据。
Simple Summary Increased genetic diversity in plants is probably associated with greater ambient temperatures. To test this hypothesis, we studied genetic diversity and differentiation of weedy rice populations occurring in the early- and late-season rice cultivation fields in Leizhou of southern China. Data collected from 10-year climatic records showed a higher average temperature in the late rice-cultivation seasons than in the early rice-cultivation seasons. Results obtained based on 27 SSR (simple sequence repeat) loci indicated greater genetic diversity in the late-season weedy rice populations, in addition to the considerable genetic differentiation between the early- and late-season weedy rice populations. We therefore conclude that a higher ambient temperature might be an important factor to promote the formation of genetic diversity in the late-season weedy rice populations. Abstract 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 ~2 °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 (ΔHe) 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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影响因子：
4.2
作者：
Cao, Qianjin;Lu, Bao-Rong;Grassi, Fabrizio
通讯作者：
Grassi, Fabrizio
影响因子：
3.7
作者：
He Z;Jiang X;Ratnasekera D;Grassi F;Perera U;Lu BR
通讯作者：
Lu BR
影响因子：
3.9
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
Griga, Miroslav
影响因子：
2
作者：
Garrido-Garduno, T.;Tellez-Valdes, O.;Vazquez-Dominguez, E.
通讯作者：
Vazquez-Dominguez, E.