Variability studies in pole type of Dolichos bean (Lablab purpureus L.)

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Date
2019
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Dept of Vegetable Science, OUAT, Bhubaneswar
Abstract
A field experiment was conducted at All India Co-ordinated Research Project on Vegetable Crops, Odisha University of Agriculture and Technology, Bhubaneswar with fourteen genotypes of dolichos bean (Lablab purpureus L.) in Randomized Block Design with three replications during Rabi 2018-19. The variability, correlation of pod yield with its component characters and among the components and the magnitude of influence of the characters on pod yield was worked out through path analysis. . The analysis of variance revealed highly significant differences among the mean sum of squares due to genotypes for different quantitative characters studied except number of primary branches, stem thickness, average leaf weight, pod width and number of seeds per pod indicating the presence of variability among the genotypes. The high GCV and PCV were observed for pod yield per plant (42.58 and 43.70), pod yield per hectare (42.55 and 43.69), number of pods per plant (35.32 and 36.32), inflorescence length (30.43 and 30.66), pod weight (24.73 and 25.34), pod length (23.40 and 23.72), fresh weight of roots (23.35 and 23.81) and plant height (22.73 and 23.34) indicating high variability available in the germplasm for these characters for further improvement. High heritability coupled with high genetic advance as per cent of mean was observed for characters viz., pod yield per plant, number of pods per plant, inflorescence length, pod weight, pod length, fresh weight of root, plant height, number of primary branches, pod width, days to first flowering, days to 50% flowering and number of seeds per pod indicating that these characters were least influenced by the environmental effects and governed by additive genes. The result on phenotypic and genotypic correlation coefficient revealed that pod yield per plant was significantly and positively correlated with pod yield per hectare (0.966 and 0.968), plant height (0.791 and 0.832), Number of pods per plant (0.739 and 0.766), Number of primary branches (0.521 and 0.552), Pod weight (0.486 and 0.529), Pod width (0.460 and 0.476), Stem thickness (0.426 and 0.494). However, days for 50% flowering (-0.579 and -0.626) and Days to first flowering (-0.517 and -0.559) showed significantly and negatively correlated with pod yield per plant at both phenotypic and genotypic level. Further, path coefficient analysis partitioned the correlation into direct and indirect effects. Path analysis revealed that maximum positive direct effect on pod yield per plant was exhibited through days to first flowering, plant height, number of primary branches, pod length, internodal length, pod width, fresh weight of root, inflorescence length, number of pods per plant and pod weight these characters play a major role in recombination breeding and suggested that direct selection based on these traits will be rewarded for crop improvement of dolichos bean. The genotypes viz., 2016/DOLPVAR-9 (1185.58 g), 2016/DOLPVAR-4 (1009 g) and 2016/DOLPVAR-12 (905.67 g) were found promising for pod yield per plant than other genotypes. There is a need to evaluate these high yielding genotypes in large plots and over multi locations in Odisha for their commercial utilization.
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Th-5734
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