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Type: Artigo de periódico
Title: Genetic diversity and population structure analysis of the tropical pasture grass Brachiaria humidicola based on microsatellites, cytogenetics, morphological traits, and geographical origin
Author: Jungmann, L
Vigna, BBZ
Boldrini, KR
Sousa, ACB
do Valle, CB
Resende, RMS
Pagliarini, MS
Zucchi, MI
de Souza, AP
Abstract: Brachiaria humidicola (Rendle) Schweick. is a warm-season grass commonly used as forage in the tropics. Accessions of this species were collected in eastern Africa and massively introduced into South America in the 1980s. Several of these accessions form a germplasm collection at the Brazilian Agricultural Research Corporation. However, apomixis, ploidy, and limited knowledge of the genetic basis of this germplasm collection have constrained breeding activities. The objectives of this work were to identify genetic variability in the Brazilian B. humidicola germplasm collection using microsatellite markers and to compare the results with information on the following: (1) collection sites of the accessions; (2) reproductive mode and ploidy levels; and (3) genetic diversity revealed by morphological traits. The evaluated germplasm population is highly structured into four major groups. The sole sexual accession did not group with any of the clusters. Genetic dissimilarities did not correlate with either geographic distances or genetic distances inferred from morphological descriptors. Additionally, the genetic structure identified in this collection did not correspond to differences in ploidy level. Alleles exclusive to either sexual or apomictic accessions were identified, suggesting that further evaluation of the association of these loci with apospory should be carried out.
Subject: koroniviagrass
Urochloa humidicola
forage grass
molecular markers
aposporous apomixis
Country: Canadá
Editor: Canadian Science Publishing, Nrc Research Press
Citation: Genome. Canadian Science Publishing, Nrc Research Press, v. 53, n. 9, n. 698, n. 709, 2010.
Rights: fechado
Identifier DOI: 10.1139/G10-055
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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