Controle genÃtico da qualidade da vagem em cruzamento de feijÃo-vagem x feijÃo-comum / Genetic control of pod quality in a cross between snap beans x common bean

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Information on genetic control of pod quality in snap beans Phaseolus vulgaris L. are acarce in the literature, but are nonetheless important for decision-making during a breeding programme. The objective of this work was to study the types of gene action involved in phenotypic expression of pod quality in a cross between snap beans x common bean. Two segregating populations (F2 and F2:3) were evaluated along the parental lines. The snap bean cultivar Conquista Rasteiro was used as the female parent, and the common bean line H126 as the male parent. The following traits were evaluated: pod length, between â suture width (L1), valve width (L2), pod shape (L2/L1 an shape scale from 1 = round to 5 = flat), and percent pod fiber. Non-additive gene effects were important for all traits evaluated. Even though effects were higher than environmental effects for most traits (pod length, pod shape and percent pod fiber), efficiency of selection at the individual plant tends to be low in early segregating generation, as demonstrated by the low narrow-sense heritabilities for most traits (except for L2/L1 an shape scale). At the family mean , genetic effects were higher than environmental effects for all traits under study, and most traits present high narrow-sense heritabilities, indicating high selection efficiency at family for all traits except pod length and percent fiber. The genetic coefficients of correlations were low in magnitude for all pairs of traits except for L2/L1 and pod shape scale.

ASSUNTO(S)

gene action and heritabilites populaÃÃes segregantes segregating populations melhoramento vegetal aÃÃo gÃnica e herdabilidade feijÃo-vagem beans

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