Data/hora: 25/06/2024 12:37:06

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 24/09/2010
Data da última atualização: | 28/09/2010
Autoria: | JUNGMANN, L.; VIGNA, B. B. Z.; BOLDRINI, A. C. B.; SOUSA, A. C. B.; VALLE, C. B. do; RESENDE, R. M. S.; PAGLIARINI, M. S.; ZUCCHI, M. I.; SOUZA, A. P. de.
Afiliação: | LETICIA JUNGMANN CANCADO, CNPGC; B. B. Z. VIGNA, UNICAMP; A. C. B. BOLDRINI, UEM; A. C. B. SOUSA, UNICAMP; CACILDA BORGES DO VALLE, CNPGC; ROSANGELA MARIA SIMEAO RESENDE, CNPGC; M. S. PAGLIARINI, UEM; M. I. ZUCCHI, APTS PÓLO CENTRO SUL; A. P. DE SOUZA, UNICAMP.
Título: | Genetic diversity and population structure analysis of the tropical pasture grass Brachiaria humidicola based on microsatellites, cytogenetics, morphological traits, and geographical origin.
Ano de publicação: | 2010
Fonte/Imprenta: | Genome, v.53, n.9, p. 698-709, Sept. 2010.
Idioma: | Inglês
Conteúdo: | 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.
Palavras-Chave: | Microssatélite.
Thesagro: | Brachiaria Humidicola; Marcador Molecular; Melhoramento Genético Vegetal; Pastagem.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (13283-1) - UPC - SP - PP -  -  - 497/01 - DIS