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- W2622678874 abstract "In this comprehensive study of Eutrema (Brassicaceae), five DNA markers [nuclear internal transcribed spacer (ITS) and plastid matK, rbcL, trnH-psbA and trnL-F] were sequenced for 183 individuals of 32 species of Eutrema s.l. and the closely related members of tribe Eutremeae, Chalcanthus and Pegaeophyton. The genetic-gap analyses showed that five previously described taxa are polyphyletic, and we identified 37 potential species units or independently evolving lineages. Further phylogenetic analyses were based on sequence variations of these five-marker barcodes for the typical representatives of all species units and they showed that the monospecific Chalcanthus, Pegaeophyton nepalense and P. scapiflorum are nested in and should be transferred to Eutrema, whereas P. watsonii was sister to Pycnoplinthopsis of tribe Euclidieae. Three clades were recovered in the expanded Eutrema based on the plastid DNA phylogenetic trees. However, phylogenetic relationships of some species in two later diverging clades are incongruent between ITS and plastid DNA trees and within them. These incongruences suggest possible hybridizations, incomplete lineage sorting or parallel evolution during recent species diversification in the genus. Furthermore, molecular dating and biogeographical analyses suggested that the recircumscribed Eutrema s.l. probably originated in eastern Asia, probably in central China. The origin and early divergence between three major clades of Eutrema, which are distributed mainly in central China, central Asia and the Qinghai–Tibetan Plateau (QTP), occurred in the Late Oligocene and Early Miocene, probably reflecting the extensive plateau uplifts and Asian aridification during that period. However, further diversification events from the Late Miocene to the Pleistocene, especially in response to the later QTP uplifts and climatic oscillations, might have promoted speciation of more current species through allopatric divergence and hybridization in that region. Several important taxonomic traits seem to have arisen multiple times with obvious parallel evolution. The new name E. baimashanicum and the new combinations E. nepalense, E. purii, E. renifolium, E. robustum, E. scapiflorum, E. xingshanensis and Aphragmus minutus are proposed. This case study highlights the importance of using DNA barcode sequences from multiple individuals or populations to solve evolutionary questions in a given genus." @default.
- W2622678874 created "2017-06-15" @default.
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- W2622678874 date "2017-06-01" @default.
- W2622678874 modified "2023-10-16" @default.
- W2622678874 title "An integrative study of evolutionary diversification of Eutrema (Eutremeae, Brassicaceae)" @default.
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- W2622678874 doi "https://doi.org/10.1093/botlinnean/box024" @default.
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