Phylogenetic reconstruction and diversification of the Triticeae (Poaceae) based on single-copy nuclear Acc1 and Pgk1 gene data

Two single-copy nuclear gene (Acc1 and Pgk1) sequences were used to estimate the phylogeny and diversification patterns of the Triticeae. Phylogenetic analyses and diversification patterns suggested that (1) a major radiation occurring in the Triticeae about 6.1–9.2 MYA might have been triggered by...

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Bibliographic Details
Published in:Biochemical systematics and ecology 2013-10, Vol.50, p.346-360
Main Authors: Fan, Xing, Sha, Li-Na, Yu, Shuang-Bin, Wu, Dan-Dan, Chen, Xiao-Hong, Zhuo, Xiao-Feng, Zhang, Hai-Qin, Kang, Hou-Yang, Wang, Yi, Zheng, You-Liang, Zhou, Yong-Hong
Format: Article
Language:English
Subjects:
Aegilops
Australopyrum
climate
Climate oscillations
Diversification
domestication
genes
habitats
mating systems
Monogenomic genera
Phylogeny
Poaceae
polyploidy
Pseudoroegneria
Thinopyrum bessarabicum
Thinopyrum elongatum
Triticeae
Triticum
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Summary:Two single-copy nuclear gene (Acc1 and Pgk1) sequences were used to estimate the phylogeny and diversification patterns of the Triticeae. Phylogenetic analyses and diversification patterns suggested that (1) a major radiation occurring in the Triticeae about 6.1–9.2 MYA might have been triggered by the late Miocene climate oscillations; (2) the Triticeae lineages from Mediterranean and Arctic-temperate regions were evolutionarily distinct; (3) the relationship between Thinopyrum bessarabicum and Triticum/Aegilops is more closely than that between Lophopyrum elongatum and Triticum/Aegilops; (4) Pseudoroegneria is closely related to Australopyrum and Lophopyrum; (5) Australopyrum might originate from colonization via South-east Asia during the late Miocene; (6) Habitats, mating systems, and climate oscillations may associated with the diversification rate shifts leading to the majority of Mediterranean lineage. Diversification rate shifts in Mediterranean lineage of the Triticeae not only spur the occurrence of many endemic lineages but also provide opportunity for polyploid crop origin and domestication. •A major radiation occurred in the tribe due to the late Miocene climate oscillations.•Lineages from the Mediterranean and Arctic-temperate regions were differentiated.•Habitats, mating systems, and climate oscillations may associate with the diversification rate shifts.
ISSN:0305-1978
1873-2925
DOI:10.1016/j.bse.2013.05.010