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题名: Genetic variation and phylogeography of Psammosilene tunicoides (Caryophyllaceae), a narrowly distributed and endemic species in south-western China
作者: Zhang, Qing-Ying1, 2; Zhao, Yu-Juan1; null(龚洵)1
刊名: AUSTRALIAN JOURNAL OF BOTANY
关键词: QINGHAI-TIBETAN PLATEAU ; POPULATION-STRUCTURE ; INTEGRATED SOFTWARE ; SEQUENCE ALIGNMENT ; DNA POLYMORPHISM ; RANGE EXPANSION ; ALPINE PLANTS ; CHLOROPLAST ; HAPLOTYPES ; HISTORY
英文摘要: Psammosilene tunicoides is a narrowly distributed and endemic species in south-western China. An investigation of sequence variation at two chloroplast DNA (cpDNA) regions (rpL16, trnQ-5'rps16) and one nuclear DNA (nDNA) locus (GPA1) were carried out to survey the population structure and population history of the species. Among the 22 populations across its geographical range, nine chloroplast haplotypes and 17 nuclear alleles were identified. Both cpDNA and nDNA consistently revealed high levels of population differentiation (G(ST) = 0.604 and 0.540, respectively), suggesting a distinct phylogeographic structure (N(ST) > G(ST), P < 0.01). This high genetic differentiation might be a combined effect of breeding system, limited pollen and seed dispersal and geographic isolation of populations. The level of haplotype diversities (cpDNA, h(T) = 0.575; nDNA, h(T) = 0.724) were high, but the nucleotide diversities (cpDNA, pi = 0.00099; nDNA, pi = 0.00105) were low. These results together with the star-like phylogenetic pattern and neutrality tests indicate that P. tunicoides has experienced a population expansion event in its evolution. Limited genetic exchange after population expansion was supported by the pronounced genetic differentiation among populations as well as evidence for 'isolation-by-distance' revealed by cpDNA. Due to high population subdivision and complex landscape, as many populations as possible should be considered for genetic conservation.
出版日期: 2011
卷号: 59, 期号:5, 页码:450-459
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
ISSN号: 0067-1924
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/3824
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 Biodivers & Biogeog, Kunming 650204, Peoples R China
2.Yunnan Acad Agr Sci, Ind Crops Res Inst, Kunming 650205, Peoples R China

Recommended Citation:
Zhang, Qing-Ying; Zhao, Yu-Juan; Gong, Xun.Genetic variation and phylogeography of Psammosilene tunicoides (Caryophyllaceae), a narrowly distributed and endemic species in south-western China,AUSTRALIAN JOURNAL OF BOTANY,2011,59(5):450-459
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