Response of an alpine plant to Quaternary climate change: a phylogeographic study of Saxifraga tangutica (Saxifragaceae) in the Qinghai-Tibetan Plateau and Himalayas

	Response of an alpine plant to Quaternary climate change: a phylogeographic study of Saxifraga tangutica (Saxifragaceae) in the Qinghai-Tibetan Plateau and Himalayas
	Li, Yan; Ma, Xiaolei; Cao, Qian; Gengji, Zhuoma; Lv, Yanna; Gao, Qingbo
刊名	BRAZILIAN JOURNAL OF BOTANY
	2023
卷号	46 期号:1 页码:69
英文摘要	The uplift of the Qinghai-Tibetan Plateau (QTP) and climatic oscillations during the Quaternary had a pronounced effect on the genetic structure and spatial distribution of plant species in these mountains. We studied the effects of past climate changes on the evolutionary history of the alpine species Saxifraga tangutica Engler. We used 199 individuals from 18 populations and analyzed the molecular sequences of cpDNA (trnL-trnF, rpl16) and the nrDNA ITS of S. tangutica. A total of 77 haplotypes and 109 genotypes were detected from the concatenated cpDNA and ITS sequences, respectively. A high proportion of private haplotypes/genotypes were restricted to single populations, supporting the existence of microrefugia for this species during the Quaternary glaciations. Phylogenetic trees of cpDNA and ITS datasets showed that the relationships of haplotypes/genotypes were largely unresolved. Combining the distribution pattern of haplotypes/genotypes, high genetic diversity of populations, and shallow differentiation degree of haplotypes, we speculated that a rapid intraspecific diversification occurred in S. tangutica, which was probably associated with the Quaternary climate oscillations. AMOVA analysis revealed that the genetic variation mainly resided within populations. Molecular clock analysis showed that the intraspecific diversification within S. tangutica occurred at about 1.24 Ma (95% HPD = 0.84-1.64), which was consistent with the first extensive Quaternary glaciations on the QTP (1.17 Ma). The simulated distribution showed that the species experienced reduction and fragmentation in the Last Glacial Maximum. Combining characteristics of the molecular data and species distribution modeling, we infer that the climatic oscillations during the Quaternary played an important role in intraspecific diversification and evolutionary history of S. tangutica.
内容类型	期刊论文
源URL	[http://210.75.249.4/handle/363003/61707]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Li, Yan,Ma, Xiaolei,Cao, Qian,et al. Response of an alpine plant to Quaternary climate change: a phylogeographic study of Saxifraga tangutica (Saxifragaceae) in the Qinghai-Tibetan Plateau and Himalayas[J]. BRAZILIAN JOURNAL OF BOTANY,2023,46(1):69.
APA	Li, Yan,Ma, Xiaolei,Cao, Qian,Gengji, Zhuoma,Lv, Yanna,&Gao, Qingbo.(2023).Response of an alpine plant to Quaternary climate change: a phylogeographic study of Saxifraga tangutica (Saxifragaceae) in the Qinghai-Tibetan Plateau and Himalayas.BRAZILIAN JOURNAL OF BOTANY,46(1),69.
MLA	Li, Yan,et al."Response of an alpine plant to Quaternary climate change: a phylogeographic study of Saxifraga tangutica (Saxifragaceae) in the Qinghai-Tibetan Plateau and Himalayas".BRAZILIAN JOURNAL OF BOTANY 46.1(2023):69.