Molecular Phylogeography Analysis Reveals Population Dynamics and Genetic Divergence of a Widespread Tree Pterocarya stenoptera in China

Frontiers in Genetics

Ming-Wan Li¹  Jia-Xin Li¹  Xiao-Fan Ye¹  Zhi-Hao Qian¹  Yong Li¹  Yan-Xia He² 

[1] Innovation Platform of Molecular Biology, College of Forestry, Henan Agricultural University, Zhengzhou, China;School of Life Sciences, Henan University, Kaifeng, China;

关键词: cpDNA;    microsatellite marker;    phylogeography;    Pterocarya stenoptera;    species distribution modeling;   

DOI  :  10.3389/fgene.2019.01089

来源: DOAJ

【 摘 要 】

The geological events, past climatic fluctuations, and river systems played key roles in the spatial distribution, population dynamics, and genetic differentiation of species. In this work, we selected Pterocarya stenoptera, a widespread tree species in China, to test the roles of these factors. Four noncoding spacers, eight microsatellite (simple sequence repeat) markers, and species distribution modeling were used to examine the phylogeographical pattern of P. stenoptera. Based on chloroplast DNA data, populations of P. stenoptera were clearly clustered into three groups. The divergence time of these groups fell into the stage of the Qinghai–Tibet Movement, 1.7–2.6 Ma. For simple sequence repeat data, only one western marginal population YNYB could be separated from other populations, whereas other populations were mixed together. Our results indicated that the environmental heterogeneity resulting from the Qinghai–Tibet movement might be response for this genetic divergence. The climatic fluctuations in the Pleistocene did not cause the substantial range shift of P. stenoptera, while the fluctuations affected its population size. Moreover, we also confirmed the river systems did not act as channels or barrier of dispersal for P. stenoptera.

【 授权许可】

Unknown