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Path coefficient analysis of morphological traits and developmental stages in french bean phaseolus vulgaris

Path coefficient analysis of morphological traits and developmental stages in french bean phaseolus vulgaris

Indian Journal of Agricultural Sciences 51(2): 76-80

Observations on morphological traits and durations of vegetative and reproductive stages of 28 germ plasm lines of French bean (P. vulgaris Linn.) were subjected to path analysis assuming the yields of green pods and dry seed separately as final products. None of the vegetative intervals had a significant phenotypic correlation with seed yield. The same was true for the yield of green pods except for duration of vegetative stage V5 (5 nodes on the main stem including primary leaf node), which had a significant negative correlation (-0.395). None of the intervals between the reproductive stages were correlated with the yield of green pods, but the number of days in the reproductive state R3 (pod 2.50-2.75 cm long at 1st blossom position) had a significant negative correlation (-0.462) with the yield of dry seed. The direct effect of V5 and R3 primarily accounted for the correlations. Green pod yield was highly associated with plant height, green pods per plant and weight of green pod. Dry seed yield was positively correlated with plant height, plant spread, dry pods per plant and seeds per pod. The number of pods per plant assumed a major role in determining green and dry seed yield simultaneously. The direct effect of seed weight on dry seed yield was counterbalanced by its negative indirect effect via pods per plant and seeds per pod.

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