Effect of the number of intermatings on genetic properties of a segregant common bean population.

• Autor(a) principal: AGUIAR, M. S. de
• Data de Publicação: 2004
• Outros Autores: RAMALHO, M. A. P., ABREU, A. de F. B., CARNEIRO, J. E. de S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/212737
• topic: Bean; Plantas F2; Variância genética; Repulsão; Feijão; Intercruzamento; Phaseolus Vulgaris; Melhoramento Genético Vegetal

Objective of this study was to verify whether the intermating of F2 plants improves the efficiency of the selective process in common bean. A multiple cross involving eight parents was obtainedfor this purpose. Three populations were derived from this cross (So): without intermating, with one, and with two intermatings. One hundred and thirty families were taken from each population to assess the 5 0:2 and 5 0. 3 generations. The magnitude of the trait grain yield was not affected by intermating, while the genetic variance presented a small increase that could be due to the linkage in repulsion of some genes invclved in the trait control. The conclusion was drawn that the enhancement in the efficiency of the selective process with intermating does not justify the required time and cost investment.