PJB-2018-268
PHYLOGENETIC POSITION OF WEST AFRICAN SPECIES OF THE GENUS CROTALARIA L. (CROTALARIEAE, FABACEAE) BASED ON THE CURRENT INFRAGENERIC CLASSIFICATION
SAMAILA SAMAILA YARADUA
Abstract
Crotalaria L. (Crotalarieae, Fabaceae) is a large legume genus consisting of ca. 702 species with the majority of the species (ca. 400) distributed in tropical and sub-tropical Africa. The current existing global sectional classification of Crotalaria does not capture the majority of the West African species. In this study, we sampled the nuclear ribosomal internal transcribed spacer (ITS) gene region of seven species of Crotalaria from West Africa with the aim of determining their phylogenetic relationships and position based on the current sectional classification. Dataset was analysed using persimony and Bayesian MCMC (MrBayes) approaches. The result showed that C. macrocalyx, C. senegalensis and C. pallida are closely related and belongs to Hediriocarpae clade while C. retusa and C. goreensis, C. atrurubens, C. barkae falls within the Calycinae, Stipulosae, Longirostres and Incanae clades respectively. Our results also showed that C. retusa is resolved as sister to southern African C. papilosa in Calycinae clade. The result of this is study supported the sectional classification in Crotalaria and helps in revealing the phylogenetic position of the poorly studied West African species.
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