Selection potential for seed yield from intra- and inter-racial populations in common bean |
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Authors: | Ângela de Fátima Barbosa Abreu Magno Antonio Patto Ramalho Daniel Furtado Ferreira |
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Institution: | (1) Empresa de Pesquisa Agropecuária de Minas Gerais, C.P. 176, 37200–000 Lavras, MG, Brazil;(2) Universidade Federal de Lavras, C.P. 37, 37200–000 Lavras, MG, Brazil |
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Abstract: | Common bean populations from crosses between lines of different races are thought to be more promising for selection of high
yield potential than those from intra-racial crosses. Three distinct diallel crosses were made to test this hypothesis and
to determine the possibility of substituting diallel crosses for multivariate techniques that estimate genetic divergence.
The crosses were between races Mesoamerica × Mesoamerica, Mesoamerica × Durango and Jalisco, and Mesoamerica × Nueva Granada.
The parents and the resulting F4 populations were evaluated at Lavras-MG, Lambari-MG and Patos de Minas-MG, Brazil. The diallel analysis of seed yield was
done and the genetic divergence estimated by Mahalanobis distance. Estimates of general and specific combining ability indicated
that some inter-racial populations were more promising for selection to increase seed yield than intra-racial populations.
However, due to their undesirable seed color and size, and growth habit, especially in a short term breeding program, the
chances of obtaining high yielding lines with an acceptable bean is reduced. Genetic divergence was not a good measure to
choose the parents because usually, the most divergent groups included were not adapted lines.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | combining ability diallel crosses genetic divergence multivariate analysis Phaseolus vulgaris L |
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