A Genomic Quantitative Study on the Contribution of the Ancestral-State Bases Relative to Derived Bases in the Divergence and Local Adaptation of Populus davidiana

文献类型： 外文期刊

第一作者： Zhao, Dandan

作者： Zhao, Dandan;Zhang, Jianguo;Hui, Nan;Wang, Li;Tian, Yang;Ni, Wanning;Long, Jinhua;Jiang, Li;Li, Yi;Diao, Songfeng;Li, Jinhua;Wang, Zhaoshan;Zhang, Jianguo;Wang, Zhaoshan;Tembrock, Luke R. R.;Wu, Zhiqiang

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关键词： whole-genome re-sequencing; ancestral-state base (ASB); derived base (DB); linked selection; demographic histories

期刊名称：GENES （ 影响因子：3.5； 五年影响因子：3.9 ）

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年卷期： 2023 年 14 卷 4 期

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收录情况： SCI

摘要： Identifying alleles associated with adaptation to new environments will advance our understanding of evolution from the molecular level. Previous studies have found that the Populus davidiana southwest population in East Asia has differentiated from other populations in the range. We aimed to evaluate the contributions of the ancestral-state bases (ASBs) relative to derived bases (DBs) in the local adaptation of P. davidiana in the Yunnan-Guizhou Plateau from a quantitative perspective using whole-genome re-sequencing data from 90 P. davidiana samples from three regions across the species range. Our results showed that the uplift of the Qinghai-Tibet Plateau during the Neogene and associated climate fluctuations during the Middle Pleistocene were likely an important factor in the early divergence of P. davidiana. Highly differentiated genomic regions between populations were inferred to have undergone strong linked natural selection, and ASBs are the chief means by which populations of P. davidiana adapt to novel environmental conditions; however, when adapting to regions with high environmental differences relative to the ancestral range, the proportion of DBs was significantly higher than that of background regions, as ASBs are insufficient to cope with these environments. Finally, a number of genes were identified in the outlier region.

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