Potential refugium on the Qinghai–Tibet Plateau revealed by the chloroplast DNA phylogeography of the alpine species Metagentiana striata (Gentianaceae)
By Shengyun Chen, Guili Wu, Dejun Zhang, Qingbo Gao, Yizhong Duan, Faqi Zhang, Shilong Chen. 2008
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Metagentiana striata is an alpine annual herbaceous plant endemic to the east of the Qinghai-Tibet (Q-T) Plateau and adjacent areas. The phylogeography of M. striata was studied by sequencing the chloroplast DNA (cpDNA) trnS-trnG intergenic spacer. Ten haplotypes were identified from an investigation of 232 individuals of M. striata from 14 populations covering the entire geographical range of this species. The level of differentiation amongst populations was very high (G(ST) = 0.746; N-ST = 0.774) and a significant phylogeographical structure was observed (P < 0.05). An analysis of molecular variance found a high variation amongst populations (76%), with F-ST = 0.762 (highly significant, P < 0.001), indicating that little gene flow occurred amongst the different regions; this was explained by the isolation of populations by high mountains along the Q-T Plateau and adjacent areas (N-m = 0.156). Only one ancestral haplotype (A) was common and widespread throughout the distributional range of M. striata. The populations of the Hengduan Mountains region of the south-eastern Q-T Plateau showed high diversity and uniqueness of haplotypes. It is suggested that this region was the potential refugium of M. striata during the Quaternary glaciation, and that interglacial and postglacial range expansion occurred from this refugium. This scenario was in good agreement with the results of nested clade analysis, which inferred that the current spatial distribution of cpDNA haplotypes and populations resulted from range expansion, together with past allopatric fragmentation events. (c) 2008 The Linnean Society of London.
Subfields: Ecology, Evolution, Behavior and Systematics, Molecular Biology
View Paper: https://www.semanticscholar.org/paper/d0b92dbe4a23df214288a3bfa2a1306c9b3d5e99
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In Molecular Biology
Citations in the corpus
- Evolutionary history and underlying adaptation of alpine plants on the Qinghai–Tibet Plateau (2014, background): “2 Summary two: Evolutionary responses to Quaternary climatic oscillations As found in North America and Europe, a certain haplotype in some species is widespread in the QTP platform and was also found in populations as one of several haplotypes occurring at the plateau edge (Zhang et al., 2005; Meng”
- Phylogeographic studies of plants in China: Advances in the past and directions in the future (2012, background): “…multiple glacial refugia for a limited number of species with glacial refugia being sparsely located in the mountains from the north to the south (e.g., Chen et al., 2008a; Du et al., 2009; Tian et al., 2009; Bai et al., 2010; Guo et al., 2010; Ren et al., 2011; Zeng et al., 2011; An et al., 2012).”