Variability and Correlation Studies in Okra (Abelmoschus esculentus (L.) Moench)
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Date
2003
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SKUAST Kashmir
Abstract
A field experiment was conducted using 31 diverse genotypes of okra during summer 2002 at Vegetable Experimental Farm, SKUAST (K), Shalimar to estimate the variability, heritability, correlation and path coefficient for 12 traits. The experimental material was planted in RBD with three replications at a spacing of 45x30 cm. The observations were recorded on ten randomly selected plants.
Analysis of data revealed highly significant differences among the genotypes for all the traits under study except 100-seed weight which was significant at 5% level of significance. The phenotypic coefficient of variability was found higher than corresponding genotypic coefficient of variability for all the traits. All the traits except days to first fruit picking, fruit length and 100-seed weight showed high estimated of phenotypic as well as genotypic coefficient of variability. The maximum phenotypic and genotypic coefficient of variability was observed for seed yield plant-1 followed number of branches plant-1 and number of seed pod-1. The high estimates of heritability (bs) was recorded for all the traits except days to first fruit picking which ranged from 54.28 percent for days to first fruit picking to 99.83 percent for number of seeds pod-1. The value of genetic gain ranged from 2.45 (days to first fruit picking) to 57.40 (seed yield plant-1). High heritability coupled with high genetic gain were recorded for all the traits except days to first fruit picking, fruit length, 100-seed weight and plant height.
In general the magnitude of genotypic correlation coefficient was higher than corresponding phenotypic correlation coefficient. Total fruit yield exhibited significant positive association with number of fruits plant-1, number of nodes plant-1, inter-nodal distance and plant height at both genotypic and phenotypic levels while negative but significant correlation was observed with average fruit weight. Fruit weight also exhibited significant negative association with inter-nodal distance, number of nodes plant-1 and number of fruits plant-1 at both the levels. Partitioning of genotypic correlation coefficient into direct and indirect effects showed that number of fruits plant-1, average fruit weight, plant height and days taken to first fruit picking had positive direct effect on total fruit yield, whereas rest of the traits exhibited negative direct effects.
From the present investigation it can be inferred that the significant variability is existing in the material and most of traits are highly heritable, hence further improvement can be made in present material through any of the selection procedures. As the characters like number of fruits plant-1, inter-nodal distance and plant height had significant positive correlation with total fruit yield and also showed positive direct effect, therefore, these characters should be taken into consideration while selecting for higher yield in okra.
Description
M.Sc Thesis submitted to SKUAST Kashmir
Keywords
Variability,Correlation, Okra, belmoschus esculentus (L.) Moench), Olericulture/Vegetable Science