title: Genetic diversity of the forage peanut in the Jequitinhonha, São Francisco, and Paranã River valleys of Brazil.
abstract: Arachis pintoi and A. repens are legumes with a high forage value that are used to feed ruminants in consortium systems. Not only do they increase the persistence and quality of pastures, they are also used for ornamental and green cover. The objective of this study was to analyze microsatellite markers in order to access the genetic diversity of 65 forage peanut germplasm accessions in the section Caulorrhizae of the genus Arachis in the Jequitinhonha, São Francisco and Paranã River valleys of Brazil. Fifty-seven accessions of A. pintoi and eight of A. repens were analyzed using 17 microsatellites, and the observed heterozygosity (HO), expected heterozygosity (HE), number of alleles per locus, discriminatory power, and polymorphism information content were all estimated. Ten loci (58.8%) were polymorphic, and 125 alleles were found in total. The HEranged from 0.30 to 0.94, and HOvalues ranged from 0.03 to 0.88. By using Bayesian analysis, the accessions were genetically differentiated into three gene pools. Neither the unweighted pair group method with arithmetic mean nor a neighbor-joining analysis clustered samples into species, origin, or collection area. These results reveal a very weak genetic structure that does not form defined clusters, and that there is a high degree of similarity between the two species.
authors.affiliation: Programa de Pós-Graduação em Biotecnologia e Recursos Genéticos da Rede Bionorte, Embrapa Rondônia, Porto Velho, RO, Brasil.
authors.forename: H S F S
authors.initials: HS
authors.lastname: Azêvedo
authors.affiliation: Universidade Federal da Paraíba, João Pessoa, PB, Brasil.
authors.forename: A C B
authors.initials: AC
authors.lastname: Sousa
authors.affiliation: Universidade Federal de São Carlos, Sorocaba, SP, Brasil.
authors.forename: K
authors.initials: K
authors.lastname: Martins
authors.affiliation: Universidade Federal do Acre, Rio Branco, AC, Brasil.
authors.forename: J C
authors.initials: JC
authors.lastname: Oliveira
authors.affiliation: Embrapa Acre, Rio Branco, AC, Brasil.
authors.forename: R B T
authors.initials: RB
authors.lastname: Yomura
authors.affiliation: Embrapa Acre, Rio Branco, AC, Brasil.
authors.forename: L M
authors.initials: LM
authors.lastname: Silva
authors.affiliation: Embrapa Recursos Genéticos e Biotecnologia, Parque Estação Biológica, Brasília, DF, Brasil.
authors.forename: J F M
authors.initials: JF
authors.lastname: Valls
authors.affiliation: Embrapa Acre, Rio Branco, AC, Brasil.
authors.forename: G M L
authors.initials: GM
authors.lastname: Assis
authors.affiliation: Embrapa Acre, Rio Branco, AC, Brasil tatiana.campos@embrapa.br.
authors.forename: T
authors.initials: T
authors.lastname: Campos
mesh_terms: D000483:Alleles; D010367:Arachis / Q000145:classification / Q000235:genetics*; D001938:Brazil; D005788:Gene Pool; D049810:Genetic Speciation; D006579:Heterozygote; D018895:Microsatellite Repeats; D011110:Polymorphism, Genetic