"Effect of Yangtze River on population genetic structure of the relict " by Qifang Geng, Zhingang Yao et al.

Department of Earth and Environment

Title

Effect of Yangtze River on population genetic structure of the relict plant Parrotia subaequalis in eastern Chin

Authors

Qifang Geng, Nanjing universityFollow
Zhingang Yao, Nanjing University; Wetland Conservation Station of Jiangsu Province
Jie Yang, Nanjing University
Jia He, Nanjing University
Danbi Wong, Nanjing University
Zhongsheng Wang, Nanjing UniversityFollow
H. Liu, Department of Earth and Environment, Florida International University; Center for Tropical Plant Conservation, Fairchild Tropical Botanic GardenFollow

Date of this Version

8-25-2015

Document Type

Article

Abstract

Parrotia subaequalis (Hamamelidaceae) is a Tertiary relic species endemic in eastern China. We used inter-simple sequence repeat (ISSR) markers to access genetic diversity and population genetic structure in natural ﬁve populations of P. subaequalis. The levels of genetic diversity were higher at species level (H = 0.2031) but lower at population level (H = 0.1096). The higher genetic diversity at species levels might be attributed to the accumulation of distinctive genotypes which adapted to the different habitats after Quaternary glaciations. Meanwhile, founder effects on the early stage, and subsequent bottleneck of population regeneration due to its biological characteristics, environmental features, and human activities, seemed to explain the low population levels of genetic diversity. The hierarchical AMOVA revealed high levels (42.60%) of among-population genetic differentiation, which was in congruence with the high levels of Nei’s genetic differentiation index (GST = 0.4629) and limited gene ﬂow (Nm = 0.5801) among the studied populations. Mantel test showed a signiﬁcant isolation-by-distance, indicating that geographic isolation has a signiﬁcant effect on genetic structure in this species. Unweighted pair-group method with arithmetic average clustering, PCoA, and Bayesian analyses uniformly recovered groups that matched the geographical distribution of this species. In particular, our results suggest that Yangtze River has served as a natural barrier to gene ﬂow between populations occurred on both riversides. Concerning the management of P. subaequalis, the high genetic differentiation among populations indicates that preserving all ﬁve natural populations in situ and collecting enough individuals from these populations for ex situ conservation are necessary.

Comments

Originally published in Ecology and Evolution. Publisher John Wiley & Sons Ltd.

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.

Recommended Citation

Geng, Qifang; Yao, Zhingang; Yang, Jie; He, Jia; Wong, Danbi; Wang, Zhongsheng; and Liu, H., "Effect of Yangtze River on population genetic structure of the relict plant Parrotia subaequalis in eastern Chin" (2015). Department of Earth and Environment. 2.
https://digitalcommons.fiu.edu/earth_environment_fac/2

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Earth Sciences Commons, Environmental Sciences Commons

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DOI

10.1002/ece3.1734

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