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The genus Bauhinia s.l. (Leguminosae): a phylogeny based on the plastid trnL–trnF region

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Abstract:

As the largest genus in tribe Cercideae, the pantropical genus Bauhinia has been the subject of a number of regional treatments in which it has been recognized either as a single genus with several subgenera or as several distinct genera. With the aim to better understand the taxon relationships within Bauhinia and between it and related genera, we have sequenced the plastid trnL–trnF region for 85 species, which together are representative of the eight genera recognized within Bauhinia sensu lato by some workers. In addition, representative taxa were verified for the presence or absence of the plastid rpl2 intron, which previous studies indicated might be a marker for specific lineages within Bauhinia s.l. Both Bayesian and parsimony analyses indicate that Bauhinia s.l. is paraphyletic with the monospecific genus Brenierea clustered within it. This genus, usually described as sister to Bauhinia s.l., forms a clade with the genera Piliostigma and Bauhinia sensu stricto. The remaining genera (Gigasiphon, Tylosema, Barklya, Phanera, Lasiobema, and Lysiphyllum) form a second clade sister to the first. All of these segregate genera are monophyletic except for Phanera, which is divided into two lineages comprising the Asian Phanera species together with the genus Lasiobema, and the second comprising the American Phanera species. The relationship between the BreniereaBauhinia s.str.–Piliostigma clade, the GigasiphonTylosemaBarklyaPhaneraLasiobemaLysiphyllum clade and the genus Griffonia is not well resolved, but Adenolobus is sister to this large monophyletic group and the genus Cercis is sister to all other Cercideae. Preliminary analyses of the rpl2 plastid region also support the PiliostigmaBreniereaBauhinia s.str. clade, suggesting a unique loss event of the intron prior to the diversification of this clade.

Le genre pantropical Bauhinia, le plus large de la tribu des Cercideae, a été traité, dans plusieurs classifications régionales, tant comme un seul genre regroupant plusieurs sous-genres, que comme plusieurs genres distincts. Afin de mieux comprendre les relations au sein du genre Bauhinia, 85 espèces représentatives des huit genres reconnus au sein de Bauhinia sensu lato par certains auteurs ont été séquencées pour la région trnL–trnF.De plus, la présence–absence de l’intron rpl2 a été vérifiée pour certains taxa ciblés, puisque, selon certaines études, cette région serait informative pour la taxonomie de Bauhinia s.l. Les analyses de parcimonie et bayesienne suggèrent le paraphylétisme du genre Bauhinia s.l. puisqu’il inclut le genre Brenierea. Ce genre, généralement reconnu comme taxon frère de Bauhinia s.l., forme un clade avec les genres Piliostigma et Bauhinia sensu stricto. Les autres genres (Gigasiphon, Tylosema, Barklya, Phanera, Lasiobema, Lysiphyllum) forment un second clade, frère du premier. Tous ces genres apparaissent monophylétiques, excepté Phanera qui est divisé en deux lignées, comprenant les Phanera asiatiques regroupés avec le genre Lasiobema, et les Phanera américaines. Les résultats préliminaires pour la région rpl2 supportent le clade PiliostigmaBreniereaBauhinia s.str., suggérant un évènement unique de perte de l’intron survenu avant la diversification de ce clade.

Document Type: Research Article

Publication date: October 1, 2009

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  • Published since 1929, this monthly journal features comprehensive research articles and notes in all segments of plant sciences, including cell and molecular biology, ecology, mycology and plant-microbe interactions, phycology, physiology and biochemistry, structure and development, genetics, systematics, and phytogeography. It also publishes commentary and review articles on topics of current interest, contributed by internationally recognized scientists.

    Previously published as the Canadian Journal of Botany
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