Abstract Detail



Conservation Biology

Liu, Li [1], Wang , Zhen [2], Huang, Lijie [1], Wang, Ting [3], Su, Yingjuan [4].

Chloroplast Population Genetics Reveals Low Genetic Variation and Conformation to the Central-Marginal Hypothesis in Taxus wallichiana var. mairei, an Endangered Conifer Endemic to China.

Taxus wallichiana var. mairei is an evergreen, outbreeding, long-lived, and wind-dispersed conifer. Its distributions are very extensive and almost cover the whole China. To survey its genetic variation patterns in chloroplast genome, we first employed eight cpSSRs to assess variation among 22 populations encompassing nearly the entire distribution range in China located along central-marginal gradients. The results showed that low genetic variation and genetic differentiation occurred in T. wallichiana var. mairei populations, which was ascribed to low rate of nucleotide mutations in chloroplast genome, and effective pollen or seed dispersal distances and its cloning reproduction, respectively. Hunan and Hubei were identified as main refugia based on high cpSSR private haplotype numbers. Variation trend of genetic diversity and genetic differentiation from core to peripheral populations of T. wallichiana var. mairei supported the prediction of the central-marginal hypothesis in chloroplast genome. In the context of climate change, conservation of peripheral populations is the focus of attention. Our MAXENT results indicated that some peripheral populations would disappear, and peripheral areas (Fujian) even core areas (Jiangxi) would not become significantly favorable in the future. Precipitation of driest month (Bio14), annual precipitation (Bio12), and temperature annual range (Bio7) were identified as most important decisive factors for its distribution. This study will provide solid theoretical basis for conservation of T. wallichiana var. mairei.   This work was supported by the National Natural Science Foundation of China (31370364, 31570652, 31670200, and 31770587) and the Natural Science Foundation of Guangdong Province, China (2016A030313320 and 2017A030313122).                             *Correspondence: Ting Wang, Yingjuan Su tingwang@scau.edu.cn (Ting Wang), suyj@mail.sysu.edu.cn (Yingjuan Su)  


1 - Sun Yat-Sen University, Xingang Xi Lu 135, Guangzhou, Guangdong, 510275, China
2 - Nanjing Agricultural University, Weigang 1, Nanjing, Jiangsu, China
3 - South China Agricultural University, Wushan, Guangzh, Guangdong, 510275, China
4 - Sun Yat-Sen University

Keywords:
Taxus wallichiana var. mairei
cpSSRs
the central-marginal hypothesis
low genetic variation
climatic variable.

Presentation Type: Oral Paper
Number: 0003
Abstract ID:696
Candidate for Awards:None


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