Epistasis in an Andean X Mesoamerican cross of common bean. / Epistasia em cruzamento de feijÃo andino x mesoamericano

AUTOR(ES)

Alexsander LuÃs Moreto

DATA DE PUBLICAÇÃO

2008

RESUMO

Common bean (Phaseolus vulgaris L.) was domesticated in at least two distinct regions, the Mesoamerican and the Andean regions. Seeking to amplify the genetic variability for several characters of common bean, crossings of beans from these two regions has been proposed. However, besides the incompatibility that makes unfeasible most of the crossings, when they happen, the segregating population usually does not present good performance. The presence of epistasis in the genetic control of characters of common bean has not been detected. The objective of this investigation was to check if epistasis is present in crossings between Andean x Mesoamerican beans using the triple test cross (TTC) method. The parents of the segregating population were cultivar CariocaâMG (P1 - Mesoamerican) and BRS Radiante (P2 - Andean). Seeds from the three F1 backcrossings were sown in the field to increase the number of seeds for the appropriate evaluations and for a later evaluation of the F2 generations. In July 2005, 87 F2 progenies (29 L1i + 29 L2i + 29 L3i) were evaluated at two locations for three characters: number of pods plant-1, number of grains plant-1 and grain mass plant-1. Epistasis influences the genetic control of all traits, and may be one of the factors causing inferior performance of progenies derived from crossings between Andean and Mesoamerican common bean.

ASSUNTO(S)

melhoramento vegetal componentes da variancia triple test cross epistasia variance components common bean epistasis feijoeiro comum triple test cross

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