Phylogeny and Biogeography Studies of Brachypodieae from China Based on nrITS,psbA-trnH and DMC1 Genes

doi:10.7525/j.issn.1673-5102.2018.04.003

Abstract

Abstract: Brachypodieae have two model plants, Brachypodium distachyum and Brachypodium sylvaticum, with important research value. Brachypodieae also have some problems in the systematic position with Bromeae and Triticeae. We used maximum parsimony, maximum likelihood and Bayesian inference to analyze the relationship of three tribes, basing on sequences of DMC1, nrITS, psbA-trnH and DMC1+psbA-trnH+nrITS. The phylogenetic trees respectively basing on sequences of DMC1, nrITS and DMC1+psbA-trnH+nrITS revealed that Brachypodieae, Bromeae and Triticeae fell into three separate clades. The phylogenetic trees basing on sequences of psbA-trnH show that Bromeae and Triticeae formed a one single clade. The results showed that Bromeae and Triticeae have experienced complex evolution. We estimate divergence times with BEAST, and reconstruct ancestral state with RASP. The result showed that Triticeae in china originated in northwest region,Species divergence time focused on 13-7 Ma which is consistent with the change of the cretaceous period in the Tibetan plateau. Brachypodieae in china originated in southwest region, species divergence time focused on 3 Ma which is consistent with the change of the Pliocene period in the Tibetan plateau and the change of East Asian summer monsoon(EASM). Brachypodium pretense differentiation also occurred at this period.

Key words: Brachypodieae, Poaceae, phylogeny, biogeography

CLC Number:

Q949.7

WU Po-Po, ZHANG Xue-Jie, ZHANG Luo-Yan, FAN Shou-Jin. Phylogeny and Biogeography Studies of Brachypodieae from China Based on nrITS,psbA-trnH and DMC1 Genes[J]. Bulletin of Botanical Research, 2018, 38(4): 497-505.

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