Biodiv Sci ›› 2015, Vol. 23 ›› Issue (6): 759-766.DOI: 10.17520/biods.2015109

• Orginal Article • Previous Articles     Next Articles

Phylogeography of Typha laxmannii in the northeast Qinghai-Tibet Plateau and adjacent areas

Zhenjie Ding, Dan Yu, Xinwei Xu*()   

  1. College of Life Sciences, Wuhan University, Wuhan 430070
  • Received:2015-05-03 Accepted:2015-11-09 Online:2015-11-20 Published:2015-12-02
  • Contact: Xu Xinwei

Abstract:

Quaternary climatic oscillation had a significant role in the patterns of geographic distribution and genetic structure of plants occurring in Qinghai-Tibet Plateau (QTP) and adjacent areas. In this study, we examined the phylogeographical structure of Typha laxmannii in the northeast QTP and adjacent areas based on 15 populations and 148 individuals using sequences of chloroplast rpl32-trnL and nuclear phytochelatin synthase gene. Two chloroplast haplotypes and eight nuclear haplotypes were found. All haplotypes were shared and no private haplotype was fixed in plateau populations. The genetic diversity of the populations in adjacent areas based on chloroplast DNA and nuclear DNA was four and two times greater than that of plateau populations, respectively. Genetic differentiation among plateau populations, which mainly existed between the eastern and western populations, was higher than that among adjacent areas. Our results indicate that the present patterns of genetic diversity and genetic structure of T. laxmannii in the northeast QTP and its adjacent areas were caused by postglacial recolonization from at least two refugia to plateau platform and a resulting founder effect.

Key words: graceful cattail, chloroplast rpl32-trnL intergenic spacer, phytochelatin synthase, phylogeography