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题名: Investigating the Genetic Diversity, Population Differentiation and Population Dynamics of Cycas segmentifida (Cycadaceae) Endemic to Southwest China by Multiple Molecular Markers
作者: Feng, Xiuyan1, 2; Liu, Jian1, 2; Chiang, Yu-Chung3; null(龚洵)1, 4
刊名: FRONTIERS IN PLANT SCIENCE
关键词: Cycas segmentifida ; genetic diversity ; genetic structure ; population dynamics ; conservation
英文摘要: Climate change, species dispersal ability and habitat fragmentation are major factors influencing species distribution and genetic diversity, especially for the range-restricted and threatened taxa. Here, using four sequences of chloroplast DNAs (cpDNAs), three nuclear genes (nDNAs) and 12 nuclear microsatellites (SSRs), we investigated the genetic diversity, genetic structure, divergence time and population dynamics of Cycas segmentifida D. Y. Wang and C. Y. Deng, a threatened cycad species endemic to Southwest China. High levels of genetic diversity and genetic differentiation were revealed in C. segmentifida. Haplotypes of networks showed two evolutionary units in C. segmentifida, with the exception of the nuclear gene GTP network. Meanwhile, the UPGMA tree, structure and PCoA analyses suggested that 14 populations of C. segmentifida were divided into two clades. There was significant effect of isolation by distance (IBD) in this species. However, this species did not display a significant phylogeographic structure. The divergence time estimation suggested that its haplotypes diverged during the Middle Pleistocene. Additionally, the population dynamics inferred from different DNA sequences analyses were discordant. Bottleneck analysis showed that populations of C. segmentifida did not experience any recent bottleneck effect, but rather pointed to a contraction of its effective population size over time. Furthermore, our results suggested that the population BM which held an intact population structure and occupied undisturbed habitat was at the Hardy-Weinberg equilibrium, implying that this population is a free-mating system. These genetic features provide important information for the sustainable management of C. segmentifida.
出版日期: 2017-05-19
卷号: 8, 页码:836
DOI标识: 10.3389/fpls.2017.00839
语种: 英语
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内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/51243
Appears in Collections:中国科学院东亚植物多样性与生物地理学重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Div & Biogeog East Asia, Kunming, Peoples R China
2.Univ Chinese Acad Sci, Kaohsiung, Taiwan
3.Natl Sun Yat Sen Univ, Dept Biol Sci, Kaohsiung, Taiwan
4.Chinese Acad Sci, Kunming Inst Bot, Yunnan Key Lab Wild Plant Resources, Kunming, Peoples R China

Recommended Citation:
Feng, Xiuyan,Liu, Jian,Chiang, Yu-Chung,et al. Investigating the Genetic Diversity, Population Differentiation and Population Dynamics of Cycas segmentifida (Cycadaceae) Endemic to Southwest China by Multiple Molecular Markers[J]. FRONTIERS IN PLANT SCIENCE,2017,8:836.
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