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Article: Molecular phylogenetics and floral evolution of the Cirrhopetalum alliance (Bulbophyllum, Orchidaceae): Evolutionary transitions and phylogenetic signal variation

TitleMolecular phylogenetics and floral evolution of the Cirrhopetalum alliance (Bulbophyllum, Orchidaceae): Evolutionary transitions and phylogenetic signal variation
Authors
KeywordsBulbophyllum
Cirrhopetalum alliance
Evolutionary transition
Monophyly
Phylogenetic signal
Issue Date2020
PublisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/ympev
Citation
Molecular Phylogenetics and Evolution, 2020, v. 143, p. article no. 106689 How to Cite?
AbstractThe Cirrhopetalum alliance is a loosely circumscribed species-rich group within the mega-diverse genus Bulbophyllum (Orchidaceae). The monophyletic status of the alliance has been challenged by previous studies, although established sectional classifications have yet to be tested in a phylogenetic context. We used maximum likelihood and Bayesian analyses of DNA sequence data (cpDNA: matK and psbA-trnH; nrDNA: ITS and Xdh; 3509 aligned characters; 117 taxa), including all sections putatively associated with the Cirrhopetalum alliance, to reconstruct the phylogeny. We mapped 11 selected categorical floral characters onto the phylogeny to identify synapomorphies and assess potential evolutionary transitions across major clades. Our results unequivocally support the recognition of an amended Cirrhopetalum alliance as a well-supported monophyletic group characterized by clear synapomorphies, following the inclusion of sect. Desmosanthes and the exclusion of five putative Cirrhopetalum-allied sections. Most sections within the Cirrhopetalum alliance are demonstrated to be polyphyletic or paraphyletic, necessitating a new sectional classification. The inclusion of sect. Desmosanthes revolutionizes our understanding of the alliance, with significant evolutionary transitions in floral characters detected. We further investigated six continuously variable characters of the sepals and labellum, and detect phylogenetic conservatism in labellum width and the evolutionary lability of lateral sepal length, which can partly be explained by the different functional roles they play in pollination and pollinator trapping. © 2019 Elsevier Inc.
Persistent Identifierhttp://hdl.handle.net/10722/280133
ISSN
2019 Impact Factor: 3.496
2015 SCImago Journal Rankings: 2.287

 

DC FieldValueLanguage
dc.contributor.authorHu, A-
dc.contributor.authorGale, SW-
dc.contributor.authorLiu, ZJ-
dc.contributor.authorSuddee, S-
dc.contributor.authorHsu, TC-
dc.contributor.authorFischer, GA-
dc.contributor.authorSaunders, RMK-
dc.date.accessioned2020-01-06T02:01:30Z-
dc.date.available2020-01-06T02:01:30Z-
dc.date.issued2020-
dc.identifier.citationMolecular Phylogenetics and Evolution, 2020, v. 143, p. article no. 106689-
dc.identifier.issn1055-7903-
dc.identifier.urihttp://hdl.handle.net/10722/280133-
dc.description.abstractThe Cirrhopetalum alliance is a loosely circumscribed species-rich group within the mega-diverse genus Bulbophyllum (Orchidaceae). The monophyletic status of the alliance has been challenged by previous studies, although established sectional classifications have yet to be tested in a phylogenetic context. We used maximum likelihood and Bayesian analyses of DNA sequence data (cpDNA: matK and psbA-trnH; nrDNA: ITS and Xdh; 3509 aligned characters; 117 taxa), including all sections putatively associated with the Cirrhopetalum alliance, to reconstruct the phylogeny. We mapped 11 selected categorical floral characters onto the phylogeny to identify synapomorphies and assess potential evolutionary transitions across major clades. Our results unequivocally support the recognition of an amended Cirrhopetalum alliance as a well-supported monophyletic group characterized by clear synapomorphies, following the inclusion of sect. Desmosanthes and the exclusion of five putative Cirrhopetalum-allied sections. Most sections within the Cirrhopetalum alliance are demonstrated to be polyphyletic or paraphyletic, necessitating a new sectional classification. The inclusion of sect. Desmosanthes revolutionizes our understanding of the alliance, with significant evolutionary transitions in floral characters detected. We further investigated six continuously variable characters of the sepals and labellum, and detect phylogenetic conservatism in labellum width and the evolutionary lability of lateral sepal length, which can partly be explained by the different functional roles they play in pollination and pollinator trapping. © 2019 Elsevier Inc.-
dc.languageeng-
dc.publisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/ympev-
dc.relation.ispartofMolecular Phylogenetics and Evolution-
dc.subjectBulbophyllum-
dc.subjectCirrhopetalum alliance-
dc.subjectEvolutionary transition-
dc.subjectMonophyly-
dc.subjectPhylogenetic signal-
dc.titleMolecular phylogenetics and floral evolution of the Cirrhopetalum alliance (Bulbophyllum, Orchidaceae): Evolutionary transitions and phylogenetic signal variation-
dc.typeArticle-
dc.identifier.emailSaunders, RMK: saunders@hku.hk-
dc.identifier.authoritySaunders, RMK=rp00774-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ympev.2019.106689-
dc.identifier.scopuseid_2-s2.0-85075316717-
dc.identifier.hkuros308907-
dc.identifier.volume143-
dc.identifier.spagearticle no. 106689-
dc.identifier.epagearticle no. 106689-
dc.publisher.placeUnited States-

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