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Testing generic limits in Cercidoideae (Leguminosae): Insights from plastid and duplicated nuclear gene sequences
Author(s) -
Sinou Carole,
CardinalMcTeague Warren,
Bruneau Anne
Publication year - 2020
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.1002/tax.12207
Subject(s) - biology , subfamily , monophyly , genus , pantropical , bauhinia , lineage (genetic) , clade , phylogenetic tree , leafy , evolutionary biology , molecular phylogenetics , botany , genetics , gene
Reconstructing the phylogenetic history of species in large taxonomic groups remains a challenge despite ever increasing access to molecular data. In subfamily Cercidoideae (Leguminosae), the large pantropical Bauhinia s.l. (~380 spp.) is never supported as monophyletic, but the generic boundaries and the number of genera that should be recognised remains a challenging taxonomic and phylogenetic question. Here we reconstruct the phylogeny of Bauhinia s.l. and related genera in the subfamily using sequences obtained from five loci ( matK , trnL‐F , Leafy , and two previously undetected duplicate copies of Legcyc ), which we analyse individually and in a concatenated matrix (excluding Leafy ). The individual and concatenated analyses generally support two distinct lineages in Bauhinia s.l.: (1) the Bauhinia clade, containing Bauhinia s.str., Brenierea , and Piliostigma ; and (2) the Phanera clade, containing Barklya , Cheniella , Gigasiphon , Lasiobema , Lysiphyllum , Phanera s.str., Schnella , and Tylosema . Based on our analyses, we recognise 14 genera in Cercidoideae. We resurrect the genus Tournaya from Gigasiphon , and synonymise the Asian segregate genus Lasiobema back into Phanera s.str. Our analyses reveal a clear gene duplication event in CYCLOIDEA that is shared by all Cercidoideae excluding the sister lineage to the subfamily, Cercis , supporting recent hypotheses for a whole genome duplication in all Cercidoideae except this genus.