Abstract
Common bean production is affected by a range of biotic and abiotic stresses. However, plants with a deep and well-distributed root system can adapt to these adversities. This study evaluated the genetic variation of the trait root distribution in segregating populations of common bean. We evaluated 4 parents and 12 progenies, resulting from a full diallel mating system in 2008/2009. The experiment was conducted in five growing seasons (2009/2010 to 2013/2014) in a completely randomized design with two replications. Root distribution was evaluated at full flowering by the method proposed by Bohm (Methods of studying root systems, 1979), with modifications, quantifying the presence or absence of roots in binomial form in a grid (0.60 m × 0.30 m). There was no significant difference between parents and progenies in F1 for the trait root distribution. On the other hand, the genotypic variation of the F2 progenies was wide, compared to the parents. In the F4 and F5 generations, regardless of the evaluated root depth, the differences between progenies and parents were less pronounced. This result indicates the increase in the proportion of additive over non-additive genetic variance for the trait root distribution.
Published Version
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