Abstract
The present study was aimed to carry out correlation and path analysis in Dolichos Bean (Lablab Purpureus L.) Genotypes . The field experiment was carried out using twenty-six genotypes of field bean in Randomized Block Design with three replications. Biometrical observations were recorded on days to fifty percent flowering, days to maturity, plant height, number of branches/plant, number of pod/plant, grain yield (g) and green pod yield (g). Among the various polygenic characters, yield is a complex character and it depends on several yield attributing characters. Hence, the knowledge of association between yield and its component traits is needed, which forms the basis for selection. Partitioning of total correlation into direct and indirect effects by path coefficient analysis helps gain information on the relative status of the plant characters, making the selection more effective. At both phenotypic and genotypic levels, green pod yield recorded moderately significant and positive correlation with plant height and number of branches/plant and the traits viz., number of pod/plant and grain yield (g) exhibited an extremely significant and positive correlation with green pod yield. Days to maturity showed the first maximum positive direct effect (3.986) on green pod yield, followed by number of pod/plant (2.241) and number of branches/plant (0.143). Whereas the other characters viz., days to fifty percent flowering, plant height and grain yield recorded direct negative effect on green pod yield. The results indicated that the characters viz., days to maturity, number of branches/plant, number of pod/plant and green pod yield were the most desirable yield contributing characters. Their contribution to grain yield and green pod yield is in positive direction via direct effect. Hence, selection based on these characters would be rewarding for improving grain yield and green pod yield in Dolichos bean.
Highlights
Dolichos bean (Lab-lab purpureus var. lignosus) is a leguminous vegetable mainly grown for green pods and dry seeds
The correlation coefficient was calculated as per the method given by Al-Jibouri et al (1958) and path coefficient analysis was estimated by the formula by Dewey and Liu (1959)
The value of genotypic correlation coefficients was found relatively higher than the value of phenotypic correlation coefficients for all the traits indicating the regulation of phenotypic expression under the impact of environmental factors (Table 1)
Summary
Dolichos bean (Lab-lab purpureus var. lignosus) is a leguminous vegetable mainly grown for green pods and dry seeds. Lignosus) is a leguminous vegetable mainly grown for green pods and dry seeds This crop is called as sem, hyacinth bean and field bean. India is considered as origin and primary centre of diversity for dolichos bean based on historical evidence. This bean has been in cultivation for 3000 years (Magalingam et al, 2013). Dolichos bean contributes to the rich source of protein in the preparations in India. It is a field crop mostly confined to a great extent in the regions of Andhra Pradesh, Tamil Nadu, Karnataka, Chhattisgarh and to some extent in parts of Bihar and Uttar Pradesh. It can be grown either as a single crop or intercrop with finger millet or pearl millet
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