Abstract Detail

Systematics Section

Moura, Tânia Maria de [1], Mansano, Vidal de Freitas [2], Souza, Anete Pereira de [1], Tozzi, Ana Maria Goulart de Azevedo [1].

Evidence of non-monophyly within Mucuna Adans. (Leguminosae - Papilionoideae) as inferred from phylogenetic analysis.

Mucuna Adans. (Leguminosae, Papilionoideae, Phaseoleae) has about 100 species and a pantropical distribution. The highest diversity of the genus is in the Old World, with only about 16-20 species in the Americas. These latter species are remarkable for their morphological diversity and different pollination syndromes. Two subgenera are recognized, Mucuna subg. Stizolobium (P. Browne) Bauer and Mucuna subg. Mucuna. The representatives of Mucuna subg. Stizolobium differ substantially from members of the tipical subgenus, mainly in relation to fruit and seed morphology. Additionally, Mucuna bennetti F. Muell. has a strict morphological relationship with Strongylodon macrobotrys A. Gray. However, phylogenetic relationships of Mucuna representatives have not been investigated yet. The phylogenetic relationships between the representatives of the Old and New World are also unknown. This study aimed to test the monophyly of Mucuna and verify the phylogenetic relationships between M. bennetti and S. macrobotrys. For that, we sampled individuals of Mucuna from the New and Old Word of both subgenera. S. macrobotrys, Desmodium cajanifolium (Kunth) DC., Erythrina fusca Lour. and E. speciosa Andrews were used as outgroups. The phylogenetic analysis was carried out using the ITS spacer region (17-26SE). Trees were obtained by maximum parsimony and likelihood methods. The results showed that Mucuna is not monophyletic because, as predicted, M. pruriens is grouped in a polytomy with the genus Erythrina and apart the rest of Mucuna. The results also suggest the monophyly of Mucuna subg. Mucuna, once all specimens of this subgenus sampled were grouped together into a single clade. Despite the reduced number of species sampled in our study we included as much morphological variation as was possible as a way to have the whole genus represented. The variation included species with the following morphological variation: inflorescence nodose and umbellate; fruit without ornamentation and ornamented; different pollination syndromes and representatives of the Old and the New World. Our results showed no phylogenetic relationship between M. bennetti and S. macrobotrys.

Broader Impacts:

1 - State University of Campinas, Vegetal Biology, Biology Institute, postal box 6109, Campinas, SP, 13083-970, Brazil
2 - Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915. , Rio de Janeiro, RJ, 22460-030, Brazil

Keywords:
Cladistics
Fabaceae
phylogeny
ITS.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM
Number: PSY013
Abstract ID:54