genetic diversity and population structure of the narrow endemic and endangered species heteroplexis microcephala y. l. chen. in china revealed by random amplified polymorphic dna markers
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2016
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Abstract
Heteroplexis microcephala Y. L. Chen. is an endemic and endangered species
found only in karst limestone regions in the Yangshuo County of the Guangxi
Zhuang Autonomous Region in China: it is a habitat representative of species
in the Heteroplexis genus. To provide basic genetic information for its
conservation, in this study we evaluated the genetic variation and
differentiation among six wild populations of H. microcephala by random
amplified polymorphic DNA markers (RAPD). The leaves of 141 individuals were
sampled. Based on 12 primers, 113 DNA fragments were generated. Genetic
diversity was low at the population level (Nei’s gene diversity (h)=0.0579;
Shannon information index (I)=0.0924; percentage of polymorphic bands
(PPB)=23.30%), but relatively high at the species level (h=0.1701; I=0.2551;
PPB=46.34%). The coefficient of genetic differentiation based on Nei’s
genetic diversity analysis (0.6661) was high, indicating that there was
significant genetic differentiation among populations, which was confirmed
by AMOVA analysis exhibiting population differentiation among populations of
68.77%. Low gene flow among populations (0.2507) may result from several
factors, such as a harsh pollination environment, population isolation and
low seed dispersal distance. Limited gene flow and self-compatibility are
the primary reasons for the high genetic differentiation observed for this
species. We propose the collection of seeds from more populations with fewer
individuals and core populations for ex situ conservation and suggest
methods to increase seed germination rates.
| Reference Key |
yancai2016archivesgenetic
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|---|---|
| Authors | ;Shi Yancai;Wei Xiao;Wei Jiqing;Li Yongtao;Chai Shengfeng;Tang Jianming |
| Journal | gastrointestinal endoscopy |
| Year | 2016 |
| DOI |
10.2298/ABS150921059S
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| URL | |
| Keywords |
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