Interrelationships association and path-coefficient analysis for pod morphological traits in snap bean (Phaseolus vulgaris L.)
Keywords:
correlation, bushing snap bean, linear regression, pod traits.Abstract
Snap bean is mainly used for its immature green pods and is cultivated all over the world with a wide geographical distribution. The biological material was composed by 20 varieties of bushing snap bean genetically and ecologically differentiated. The experimental design was a randomized block with three replications. From each plot five randomly selected plants were evaluated for the following pod traits: weight, length, width, thickness and firmness. The objective of the research was to determine the nature and extent of association among five morphological pod traits in 20 snap bean varieties, in order to perform the effective selection for the main pod traits related to yield. For this set of bushing snap bean varieties, the pod width exhibited the highest contribution to the achievement of pod weight, followed by pod length, while the pod firmness had the lowest influence. Given that only the relationships of pod width with their weight and firmness were significant, in the case of these snap bean varieties the selection for pod width brings a positive change of both pod weight and firmness. The relationship between the width and weight of pod was low and insignificant affected by the other traits. As such, the pod width can be used as an indirect selection criterion for pod weight.
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