Molecular marker-mediated validation of morphologically defined landraces of Pejibaye (<Emphasis Type="Italic">Bactris gasipaes</Emphasis>) and their phylogenetic relationships |
| |
| Authors: | Doriane P Rodrigues Spartaco Astolfi Filho Charles R Clement |
| |
| Institution: | (1) Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Av. Gal. Rodrigo Otávio Jordão Ramos 3000, 69077-000 Manaus, AM, Brazil;(2) Instituto Nacional de Pesquisas da Amazônia, Cx. Postal 478, 69011-970 Manaus, AM, Brazil |
| |
| Abstract: | RAPD markers were used to evaluate the genetic variability and structure of seven morphologically defined landraces of pejibaye (Bactris gasipaes Kunth, Palmae) to determine their validity and phylogenetic relationships. Two hundred and twenty plants of four Amazonian and three Central American landraces of var.gasipaes (the domesticate) and 30 plants of var.chichagui (H. Karsten) Henderson (the crop ancestor) maintained at the National Research Institute for Amazonia, Manaus, Amazonas, Brazil, were utilized. Eight RAPD primers yielded 113 markers, with good reproducibility, of which 97 were polymorphic. The four Amazonian landraces had an average heterozygosity of 0.30, with 86% polymorphism, greater than the Central American landraces (0.25; 74.3%) and var.chichagui (0.27; 80%). Among landrace genetic diversity (GST) was 15%, while within (Hs) was 85%, essentially equivalent to the AMOVA within (82.2%) and among (17.8%) variances. The Jaccard similarities, PCA, gene flow coefficients and Exact tests suggested that only one landrace exists in Central America, called Utilis after the first taxon described there, and that the Solimões landrace is part of the Putumayo landrace, rather than a separate entity. The Pará and Pampa Hermosa landraces were validated in accordance with their morphometric interpretations. The dendrogram of Nei s genetic distances among valid landraces and var.chichagui supported the hypothesis of a single origin for pejibaye in southwestern Amazonia, with two migration routes: one to the northeast, becoming the Pará landrace, and another to the northwest along the Andes, spreading into western Amazonia (Pampa Hermosa and Putumayo landraces) and across the Andes, reaching Central America (Utilis landrace). |
| |
| Keywords: | Bactris gasipaes Crop origin Landraces Phylogenetic analysis RAPD |
| 本文献已被 SpringerLink 等数据库收录！ |
|
