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A 10‐gene phylogeny of Solanum section Herpystichum (Solanaceae) and a comparison of phylogenetic methods
Author(s) -
Tepe Eric J.,
Farruggia Frank T.,
Bohs Lynn
Publication year - 2011
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.3732/ajb.1000516
Subject(s) - biology , supertree , phylogenetic tree , maximum parsimony , phylogenetics , evolutionary biology , bayesian probability , genetics , statistics , clade , gene , mathematics
• Premise of the study: Solanum section Herpystichum is a lineage that comprises both widespread and very narrowly distributed species. This study investigates the phylogenetic relationships of sect. Herpystichum and evaluates several phylogenetic methods for analysis of multiple sequences. • Methods: Sequence data from seven nuclear (ITS, GBSSI, and five COSII) and three plastid ( psbA–trnH , trnT–trnF , and trnS–trnG ) regions were concatenated and analyzed under maximum parsimony and Bayesian criteria. In addition, we used two analytical methods that take into account differences in topologies resulting from the analyses of the individual markers: Bayesian Estimation of Species Trees (BEST) and supertree analysis. • Key results: The monophyletic Solanum sect. Herpystichum was resolved with moderate support in the concatenated maximum parsimony and Bayesian analyses and the supertree analysis, and relationships within the section were well‐resolved and strongly supported. The BEST topology, however, was poorly resolved. Also, because of how BEST deals with missing sequences, >25% of our accessions, including two species, had to be excluded from the analyses. Our results indicate a progenitor‐descendent relationship with two species nested within the widespread S. evolvulifolium . • Conclusions: Analytical methods that consider individual topologies are important for studies based on multiple molecular markers. On the basis of analyses in this study, BEST had the serious shortcoming that taxa with missing sequences must be removed from the analysis or they can produce spurious topologies. Supertree analysis provided a good alternative for our data by allowing the inclusion of all 10 species of sect. Herpystichum .