Local habitat condition rather than geographic distance determines the genetic structure of Tamarix chinensis populations in Yellow River Delta, China

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• 作者：Zhu Zhu ; Luoyan Zhang ; Lexuan Gao ; Shaoqing Tang ; Yao Zhao…
• 关键词：Tamarix chinensis ; Heterogeneous habitats ; Genetic structure ; Soil salinity
• 刊名：Tree Genetics & Genomes
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：12
• 期：1
• 全文大小：1,284 KB
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• 作者单位：Zhu Zhu (1)
  Luoyan Zhang (1)
  Lexuan Gao (1) (2)
  Shaoqing Tang (3)
  Yao Zhao (1)
  Ji Yang (1) (2)
  
  1. Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Center for Evolutionary Biology, School of Life Sciences, Fudan University, 2005 Songhu Road, Shanghai, 200438, China
  2. Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai Chenshan Botanical Garden, Shanghai, 201602, China
  3. College of Life Sciences, Guangxi Normal University, Guilin, 241004, China
  
• 刊物主题：Forestry; Plant Genetics & Genomics; Plant Breeding/Biotechnology; Tree Biology; Biotechnology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1614-2950

文摘

Understanding the extent of genetic diversity in natural populations and the correlations between population structure and environmental heterogeneity is of great importance to estimation of the potential for species to undergo rapid adaptive changes in response to environmental variation. In this study, we systematically sampled 800 individuals from 26 Tamarix chinensis populations distributed throughout the Yellow River Delta (YRD) region in China, where a mosaic of habitat patches varying in soil salinity was detected. By exploring the micro-geographic genetic structure using the co-dominant microsatellite (SSR) markers, we aimed to answer questions as to what extent the populations diverged and how habitat heterogeneity affected the local population structure and dynamics of T. chinensis in YRD. The results demonstrated a moderate high level of genetic diversity and a low level of genetic differentiation in T. chinensis populations. The genetic variation was mainly maintained within populations, with a weak but significant genetic differentiation being detected among populations (Fst = 0.053, P < 0.001). While the overall genetic diversity within populations decreased progressively along with the increasing soil salinity, the locus T1D12 exhibited an elevated variation among populations, with the allele 558 (T1D12) showing a significantly higher frequency in highly saline habitats than in other sites, suggesting that the ecological differences among patchy habitats led to weak but significant adaptive divergence among populations. Local habitat conditions rather than geographic distances determine the genetic structure of T. chinensis populations in YRD. Keywords Tamarix chinensis Heterogeneous habitats Genetic structure Soil salinity