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Phylogenetic analyses of Saussurea sect. Pseudoeriocoryne (Asteraceae : Cardueae) based on chloroplast DNA trnL-F sequences
Wang, Y; Liu, JQ
2004-11-01
Source PublicationBIOCHEMICAL SYSTEMATICS AND ECOLOGY
Volume32Issue:11Pages:1009-1023
SubtypeArticle
AbstractThe genus Saussurea is distributed mainly in the temperate and subarctic regions of Eurasia and consists of about 300 species classified into six subgenera and 20 sections. Sect. Pseudoeriocoryne in the subgenus Eriocoryne comprises four species, and is delimited mainly by acaulescence and an inflorescence with congested capitula surrounded by a rosette of leaves. All of these species are endemic to the and Qinghai-Tibet Plateau. Sequences from the chloroplast DNA trnL-F region were obtained for the four species in this section and 26 other species from four subgenera of Saussurea to resolve phylogenetic relationships among these species and to determine whether the shared characters that define sect. Pseudoeriocoryne are synapomorphic or were acquired by convergent evolution. The resulting phylogenies indicated that Saussurea sect. Pseudoeriocoryne as traditionally defined does not constitute a monophyletic group and that each of its species belongs to separate clades. Furthermore, none of these species showed a close relationship with the other species of subgenus Eriocoryne. Our results further indicated that none of the investigated subgenera are monophyletic, and that species from different subgenera clustered together. All these conclusions are provisional and their confirmation would require stronger phylogenetic support. Two possible explanations are suggested for low sequence divergence, poor resolution of internal clades and clustering of species with the rather distinct morphology of Saussurea detected in the present study. The first is rapid radiation and diversification triggered by fast habitat fragmentation due to the recent lifting of the Qinghai-Tibet Plateau and the Quaternary climate oscillations. This could have led to rapid morphological divergence while sequences diverged very little, and also caused the convergent acquisition of similar characteristics in unrelated lineages due to similar selection pressures. The second possible explanation is that both introgressive hybridization and reticulate evolution might have caused the transferring of cpDNA sequences between morphologically dissimilar species, thus leading to homogenization of sequences between lineages. (C) 2004 Elsevier Ltd. All rights reserved.; The genus Saussurea is distributed mainly in the temperate and subarctic regions of Eurasia and consists of about 300 species classified into six subgenera and 20 sections. Sect. Pseudoeriocoryne in the subgenus Eriocoryne comprises four species, and is delimited mainly by acaulescence and an inflorescence with congested capitula surrounded by a rosette of leaves. All of these species are endemic to the and Qinghai-Tibet Plateau. Sequences from the chloroplast DNA trnL-F region were obtained for the four species in this section and 26 other species from four subgenera of Saussurea to resolve phylogenetic relationships among these species and to determine whether the shared characters that define sect. Pseudoeriocoryne are synapomorphic or were acquired by convergent evolution. The resulting phylogenies indicated that Saussurea sect. Pseudoeriocoryne as traditionally defined does not constitute a monophyletic group and that each of its species belongs to separate clades. Furthermore, none of these species showed a close relationship with the other species of subgenus Eriocoryne. Our results further indicated that none of the investigated subgenera are monophyletic, and that species from different subgenera clustered together. All these conclusions are provisional and their confirmation would require stronger phylogenetic support. Two possible explanations are suggested for low sequence divergence, poor resolution of internal clades and clustering of species with the rather distinct morphology of Saussurea detected in the present study. The first is rapid radiation and diversification triggered by fast habitat fragmentation due to the recent lifting of the Qinghai-Tibet Plateau and the Quaternary climate oscillations. This could have led to rapid morphological divergence while sequences diverged very little, and also caused the convergent acquisition of similar characteristics in unrelated lineages due to similar selection pressures. The second possible explanation is that both introgressive hybridization and reticulate evolution might have caused the transferring of cpDNA sequences between morphologically dissimilar species, thus leading to homogenization of sequences between lineages. (C) 2004 Elsevier Ltd. All rights reserved.
KeywordSaussurea Sect. Pseudoeriocoryne Trnl-f Phylogeny Rapid Radiation Hybridization
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Subject Area生物化学
WOS KeywordNOBILE HOOK-F ; MOLECULAR EVIDENCE ; THOMSON POLYGONACEAE ; NUCLEAR ; ORIGIN ; DIVERSIFICATION ; DELIMITATION ; SUBSTITUTION ; SENECIONEAE ; EVOLUTION
Indexed BySCI
Language英语
WOS Research AreaBiochemistry & Molecular Biology ; Environmental Sciences & Ecology ; Evolutionary Biology
WOS SubjectBiochemistry & Molecular Biology ; Ecology ; Evolutionary Biology
WOS IDWOS:000224806900005
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Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/1387
Collection中国科学院西北高原生物研究所
AffiliationChinese Acad Sci, Qinghai Tibet Plateau Biol Evolut & Adaptat Lab, NW Plateau Inst Biol, Xining 810008, Peoples R China
Recommended Citation
GB/T 7714
Wang, Y,Liu, JQ. Phylogenetic analyses of Saussurea sect. Pseudoeriocoryne (Asteraceae : Cardueae) based on chloroplast DNA trnL-F sequences[J]. BIOCHEMICAL SYSTEMATICS AND ECOLOGY,2004,32(11):1009-1023.
APA Wang, Y,&Liu, JQ.(2004).Phylogenetic analyses of Saussurea sect. Pseudoeriocoryne (Asteraceae : Cardueae) based on chloroplast DNA trnL-F sequences.BIOCHEMICAL SYSTEMATICS AND ECOLOGY,32(11),1009-1023.
MLA Wang, Y,et al."Phylogenetic analyses of Saussurea sect. Pseudoeriocoryne (Asteraceae : Cardueae) based on chloroplast DNA trnL-F sequences".BIOCHEMICAL SYSTEMATICS AND ECOLOGY 32.11(2004):1009-1023.
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