PJB-2017-610
GENETIC DIVERSITY OF THE ENDANGERED PLANT EXCENTRODENDRON HSIENMU (CHUN & HOW) H. T. CHANG & R. H. MIAU AND IMPLICATIONS FOR CONSERVATION
WENHUI SHEN
Abstract
Excentrodendron hsienmu is a vulnerable species with a distributed in China that is limited to the provinces of Guangxi and Yunnan. In this study, chloroplast psbA-trnH and trnL-F sequences were used to analyze genetic diversity for E. hsienmu populations. Five haplotypes were identified in 9 populations. Evolutionary analysis revealed that these 5 haplotypes could be divided into 2 clades, with 1 clade in Guangxi and the other clade in Yunnan For E. hsienmu, at the species level, haplotype diversity was 0.185, nucleotide diversity was 1.5×10–4, the genetic differentiation coefficient was 0.72055, and gene flow was 0.1939. These results indicate that E. hsienmu has a low level of genetic diversity, with significant genetic differentiation and a low gene flow among populations. The major source of variation was differences among populations. Habitat fragmentation and human activities may be the main causes of significant genetic differentiation and low genetic diversity among E. hsienmu populations.
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