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题名: Population structure of Nouelia insignis (Asteraceae), an endangered species in southwestern China, based on chloroplast DNA sequences: recent demographic shrinking
作者: null(龚洵)2; Luan, Shan-Shan2; Hung, Kuo-Hsiang3; Hwang, Chi-Chuan4; Lin, Chung-Jean1; Chiang, Yu-Chung5; Chiang, Tzen-Yuh1
刊名: JOURNAL OF PLANT RESEARCH
关键词: Nouelia insignis ; Endangered species ; Ancestral polymorphisms ; Effective population size ; Demographic expansion ; Star-like phylogenies
英文摘要: Nouelia insignis, an endangered species, is distributed in the Jinsha and Nanpan drainage areas in southwestern China. In this study, we examined the genetic diversity and population structure based on the sequences of the cpDNA rpL 16 intron. Low levels of genetic variation were detected within all populations of the endemic species. A gene genealogy of 11 haplotypes recovered two major lineages I and II, with haplotypes H1 and H6 nested as interior nodes, respectively. Haplotype H1 was widespread in all populations, while haplotype H6 was restricted to populations southern of the Jinsha River. Low levels of genetic differentiation were detected, as most F(st) values between populations were zero. This result, however, contradicts previous studies based on allozymes and fingerprinting. Genetic analyses suggested that coancestry due to low evolutionary rates resulted in the lack of geographical subdivision. Molecular dating estimated that the two lineages split about 3.224 MYA (95% CI 1.070-6.089 MYA). Maintenance of ancestral polymorphisms was possibly attributable to a long-standing large effective population size until recently. Postglacial demographic expansion was supported by a unimodal mismatch distribution and star-like phylogenies.
出版日期: 2011-03-01
卷号: 124, 期号:2, 页码:221-230
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
ISSN号: 0918-9440
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/5243
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Natl Cheng Kung Univ, Dept Life Sci, Tainan 701, Taiwan
2.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Peoples R China
3.Pingtung Univ Sci & Technol, Grad Inst Bioresources, Pingtung 912, Taiwan
4.Natl Cheng Kung Univ, Dept Engn Sci, Tainan 701, Taiwan
5.Pintung Univ Sci & Technol, Dept Life Sci, Pingtung 912, Taiwan

Recommended Citation:
Gong, X; Luan, SS; Hung, KH; Hwang, CC; Lin, CJ; Chiang, YC; Chiang, TY.Population structure of Nouelia insignis (Asteraceae), an endangered species in southwestern China, based on chloroplast DNA sequences: recent demographic shrinking,JOURNAL OF PLANT RESEARCH,2011,124(2):221-230
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