Genetic diversity and population structure analysis of the tropical pasture grass Brachiaria humidicola based on microsatellites, cytogenetics, morphological traits, and geographical origin

Autor(es)

Jungmann, L. ^{[1, 2]} ; Vigna, B. B. Z. ^[1] ; Boldrini, K. R. ^[3] ; Sousa, A. C. B. ^[1] ; do Valle, C. B. ^[2] ; Resende, R. M. S. ^[2] ; Pagliarini, M. S. ^[3] ; Zucchi, M. I. ^[4] ; de Souza, A. P. ^{[5, 1]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Ctr Mol Biol & Genet Engn CBMEG, BR-13083970 Campinas, SP - Brazil

^[2] Brazilian Agr Res Corp Embrapa, Ctr Beef Cattle Res, Plant Biotechnol Lab, BR-79002970 Campo Grande, MS - Brazil

^[3] Univ Maringa UEM, Ctr Biol Sci, Genet & Cell Biol Dept, BR-87020900 Maringa, PR - Brazil

^[4] APTA Polo Ctr, BR-13400970 Piracicaba, SP - Brazil

^[5] Univ Estadual Campinas, UNICAMP, Inst Biol, Dept Plant Biol, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GENOME; v. 53, n. 9, p. 698-709, SEP 2010.
• Citações Web of Science: 18

Resumo

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. (AU)

• Processo FAPESP: 06/52953-8 - Desenvolvimento e caracterização de marcadores moleculares microssatélites em forrageiras tropicais de interesse econômico
• Beneficiário: Adna Cristina Barbosa de Sousa
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 07/57022-5 - Mapeamento do gene de apomixia em uma população segregante de Brachiaria humidicola
• Beneficiário: Bianca Baccili Zanotto Vigna
• Linha de fomento: Bolsas no Brasil - Mestrado