Molecular Phylogeny of Subtribe Swertiinae

doi:10.7525/j.issn.1673-5102.2021.03.011

Abstract

Abstract:

It was difficult to classify the Subtribe Swertiinae in both taxonomical and phylogenetic in Gentianaceae. To understand the relationship and phylogeny of intergenetic and intra-genetic of Subtribe Swertiinae， 86 species and variants were performed with maximum likelihood（ML） and Bayesian inference methods（BI） based on the sequences of chloroplast DNA matK and rbcL regions. The key evolution period points of Subtribe Swertiinae were estimated through Bayesian analysis of molecular sequences using MCMC. The phylogenetic relationships of Subtribe Swertiinae inferred from molecular evidence were examined against the taxonomic circumscriptions in Ho Ting-nong system（2015）. The result revealed that： ①Subtribe Gentianinae and Swertiinae were monophyletic and sister groups. ②Swertia，Gentianella， Comastoma and Lomatogonium were paraphyletic in relation to each other. ③Speciation of 49（85.96%） species occurred in succession after 4 Ma， and 39（68.42%） species occurred in succession after 2.5 Ma. ④With respect of intra-genetic relationships of Swertia， the taxonomic treatment between subgen. Swertia and subgen. Ophelia were supported by the phylogenies results， while the taxonomic treatment of sect. Ophelia and sect. Platynema were partially supported. ⑤The intergenetic phylogeny of Sinoswertia，Swertia， Gentianella， Comastoma and Lomatogonium need further study， the systematic position of sect. Frasera was still uncertain.

Key words: Subtribe Swertiinae, chloroplast DNA, phylogeny, Gentianaceae

Qian CAO, Long-Hua XU, Jiu-Li WANG, Fa-Qi ZHANG, Shi-Long CHEN. Molecular Phylogeny of Subtribe Swertiinae[J]. Bulletin of Botanical Research, 2021, 41(3): 408-418.

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