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Phylogeny and biogeography of Tynanthus Miers (Bignonieae, Bignoniaceae).
Mol Phylogenet Evol. 2015 Apr; 85:32-40.MP

Abstract

The origin of Neotropical biodiversity represents a key question in evolutionary biology. Despite the attempts to decipher the role of ecological and historical factors to present-day distribution patterns, robust phylogenetic studies of Neotropical clades are still needed before a comprehensive picture of the origin of Neotropical biodiversity can be achieved. Tynanthus Miers (Bignonieae, Bignoniaceae) is a well-circumscribed genus of Neotropical lianas with species that are narrowly distributed, except from a few taxa. The genus is characterized by a clove odor, small bilabiate flowers with the two upper lobes almost fused, and fruits with raised margins, all of which represent morphological synapomorphies for this clade. Other distinctive characters are the thecae reflexed forward, the densely pubescent ovaries and the poorly-developed nectariferous disk. The circumscription of the genus has remained constant over the years, despite the problematic limits of most genera of tribe Bignonieae. In this study, we reconstruct the phylogeny of Tynanthus based on two plastid (ndhF and rpl32-trnL) and one nuclear (pepC) markers and use this phylogenetic framework to investigate the biogeographical history of the genus. Our phylogenetic hypothesis provides further support for the monophyly of Tynanthus, and strongly supports a series of infra-generic clades. Most species are reconstructed as monophyletic, while T. cognatus and T. polyanthus are paraphyletic. Biogeographic reconstructions suggest that Tynanthus originated between 9.4 and 21.5Mya, most likely at approximately 15.3Mya. The MRCA of the genus was likely broadly distributed through lowland Amazonia, Western South America and Central America and diversified in the Neotropics during the Miocene. Closely related species are generally distributed within the same biogeographic area, suggesting that niche conservatism has played an important role in the diversification history of the group.

Authors+Show Affiliations

Universidade de São Paulo, Instituto de Biociências, Departamento de Botânica, Rua do Matão, 277, 05508-090 São Paulo, SP, Brazil. Electronic address: mariaclaudiamedeiros@hotmail.com.Universidade de São Paulo, Instituto de Biociências, Departamento de Botânica, Rua do Matão, 277, 05508-090 São Paulo, SP, Brazil. Electronic address: llohmann@usp.br.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

25659336

Citation

M P de Medeiros, Maria Cláudia, and Lúcia G. Lohmann. "Phylogeny and Biogeography of Tynanthus Miers (Bignonieae, Bignoniaceae)." Molecular Phylogenetics and Evolution, vol. 85, 2015, pp. 32-40.
M P de Medeiros MC, Lohmann LG. Phylogeny and biogeography of Tynanthus Miers (Bignonieae, Bignoniaceae). Mol Phylogenet Evol. 2015;85:32-40.
M P de Medeiros, M. C., & Lohmann, L. G. (2015). Phylogeny and biogeography of Tynanthus Miers (Bignonieae, Bignoniaceae). Molecular Phylogenetics and Evolution, 85, 32-40. https://doi.org/10.1016/j.ympev.2015.01.010
M P de Medeiros MC, Lohmann LG. Phylogeny and Biogeography of Tynanthus Miers (Bignonieae, Bignoniaceae). Mol Phylogenet Evol. 2015;85:32-40. PubMed PMID: 25659336.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Phylogeny and biogeography of Tynanthus Miers (Bignonieae, Bignoniaceae). AU - M P de Medeiros,Maria Cláudia, AU - Lohmann,Lúcia G, Y1 - 2015/02/07/ PY - 2014/09/05/received PY - 2015/01/13/revised PY - 2015/01/23/accepted PY - 2015/2/10/entrez PY - 2015/2/11/pubmed PY - 2015/8/12/medline KW - Ancestral area reconstructions KW - Bignoniaceae KW - Biogeography KW - Lianas KW - Neotropical flora KW - Phylogeny SP - 32 EP - 40 JF - Molecular phylogenetics and evolution JO - Mol Phylogenet Evol VL - 85 N2 - The origin of Neotropical biodiversity represents a key question in evolutionary biology. Despite the attempts to decipher the role of ecological and historical factors to present-day distribution patterns, robust phylogenetic studies of Neotropical clades are still needed before a comprehensive picture of the origin of Neotropical biodiversity can be achieved. Tynanthus Miers (Bignonieae, Bignoniaceae) is a well-circumscribed genus of Neotropical lianas with species that are narrowly distributed, except from a few taxa. The genus is characterized by a clove odor, small bilabiate flowers with the two upper lobes almost fused, and fruits with raised margins, all of which represent morphological synapomorphies for this clade. Other distinctive characters are the thecae reflexed forward, the densely pubescent ovaries and the poorly-developed nectariferous disk. The circumscription of the genus has remained constant over the years, despite the problematic limits of most genera of tribe Bignonieae. In this study, we reconstruct the phylogeny of Tynanthus based on two plastid (ndhF and rpl32-trnL) and one nuclear (pepC) markers and use this phylogenetic framework to investigate the biogeographical history of the genus. Our phylogenetic hypothesis provides further support for the monophyly of Tynanthus, and strongly supports a series of infra-generic clades. Most species are reconstructed as monophyletic, while T. cognatus and T. polyanthus are paraphyletic. Biogeographic reconstructions suggest that Tynanthus originated between 9.4 and 21.5Mya, most likely at approximately 15.3Mya. The MRCA of the genus was likely broadly distributed through lowland Amazonia, Western South America and Central America and diversified in the Neotropics during the Miocene. Closely related species are generally distributed within the same biogeographic area, suggesting that niche conservatism has played an important role in the diversification history of the group. SN - 1095-9513 UR - https://www.unboundmedicine.com/medline/citation/25659336/Phylogeny_and_biogeography_of_Tynanthus_Miers__Bignonieae_Bignoniaceae__ DB - PRIME DP - Unbound Medicine ER -