title: Phylogenetic relationships of species of genus Arachis based on genic sequences.
abstract: The genus Arachis (Fabaceae), which originated in South America, consists of 80 species. Based on morphological traits and cross-compatibility among the species, the genus is divided into nine taxonomic sections. Arachis is the largest section including the economically valuable cultivated peanut (A. hypogaea). Seven genic sequences were utilized to better understand the phylogenetic relationships between species of genus Arachis. Our study displayed four clades of species of Arachis. Arachis triseminata was genetically isolated from all other species of Arachis studied, and it formed the basal clade with A. retusa and A. dardani from the most ancient sections Extranervosae and Heteranthae, respectively. Species of section Arachis formed a separated single clade from all other species, within which species having B and D genome clustered in one subgroup and three species characterized with an A genome grouped together in another subgroup. A divergent clade including species from five sections was sister to the clade of section Arachis. Between the sister clades and the basal clade there was a clade containing species from the more advanced sections. Phylogenetic relationships of all the species of Arachis using multiple genic sequences were similar to the phylogenies produced with single-copy genes.
authors.affiliation: a Department of Agricultural and Environmental Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
authors.forename: Guohao
authors.initials: G
authors.lastname: He
authors.forename: Noelle A
authors.initials: NA
authors.lastname: Barkley
authors.forename: Yongli
authors.initials: Y
authors.lastname: Zhao
authors.forename: Mei
authors.initials: M
authors.lastname: Yuan
authors.forename: C S
authors.initials: CS
authors.lastname: Prakash
mesh_terms: D020224:Expressed Sequence Tags; D007887:Fabaceae / Q000235:genetics*; D014644:Genetic Variation; D018745:Genome, Plant; D018895:Microsatellite Repeats; D010802:Phylogeny
keywords: EST–SSR; NBS–LRR; RGA; arachide; peanut