Genetic variability and correlation studies in garden pea (Pisum sativum L. ssp. hortense Asch and Graebn.)

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Date
2005
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SKUAST Kashmir
Abstract
Twenty five genetically diverse genotypes of garden pea (Pisum sativum L. ssp. hortense Asch and Graebn) were used to estimate the genetic variability parameters and correlation coefficients for fifteen quantitative and qualitative characters. The investigation was carried out at Vegetable Experimental Farm, Division of Olericulture during rabi 2003-04 in a randomised block design with three replications and the observations were recorded on various traits. Analysis of variance for all the traits under study revealed high significant genetic variation among all the genotypes. The genotypes viz., NDVP-8, VRP-7, NDVP-104, VL-3 and JP-19 besides being high yielders also showed high per se performance for most of the traits. Phenotypic and genotypic coefficients of variation for most of the traits were found moderate to high except for pod girth, shelling percentage, pod length, number of pods plant-1, number of branches plant-1 and number of seeds pod-1. High heritability along with high genetic gain was observed for plant height followed by dry seed yield plant-1, test weight of dry seeds, green pod yield plant-1, sugar content, protein content, node at which first flower appears, average pod weight and number of seeds pod-1 indicating that these traits could be exploited for further improvement through selection structures. Genotypic correlation coefficients between the traits were generally higher than their corresponding phenotypic correlation coefficients. Green pod yield plant-1 exhibited positive significant correlation with node at which first flower appears, plant height, pod length, pod girth, number of pods plant-1, average pod weight, number of seeds pod-1, test weight of dry seeds plant-1 and dry seed yield plant-1 whereas negative and significant interrelationship was observed between plant height and sugar content; protein content and sugar content. The path coefficient analysis at gentotypic level revealed that number of seeds pod-1 had highest positive direct effect on green pod yield plant-1 followed by shelling percentage, number of branches plant-1, number of pods plant-1, node at which first flower appears and plant height. As the characters like node at which first flower appears, plant height, number of pods plant-1 and number of seeds pod-1 had significant positive correlation with green pod yield plant-1 and also exhibited positive direct effect, therefore, these traits should be taken into consideration while selecting for higher yield in garden pea.
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M.Sc Thesis submitted to SKUAST Kashmir
Keywords
Genetic variability and correlation, Garden pea (Pisum sativum L. ssp, Hortense Asch and Graebn., Olericulture/Vegetable Science
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