Assessment of GeneticVariability and Character Association in Yield Related Traits and Yellow Vein Mosaic Virus Disease Resistance in Okra (Abelmoschus esculentus L. Moench)

Gurve Vr ,R Gnanam ,G Karthikeyan ,Swarna Priya R ,L Pugalendhi ,R Kalaiyarasi

doi:10.29321/maj.10.000558

Abstract

Okra is India’s most widely grown tropical and subtropical vegetable crop. Despite widespread cultivation, crop yield and productivity remain subpar. Yellow vein mosaic virus (YVMV) disease is a serious threat to Indian okra production, causing yield losses ranging from 17.09 to 96.49 per cent. In this context, the present study was aimed to assess the variability and character association of 74 elite germplasm accessions for thirteen quantitative and quality traits. High phenotypic and genotypic coefficient of variation (PCV and GCV) were observed among all evaluated traits except fruit diameter, which showed a moderate PCV and GCV. All traits had high heritability and high genetic advance, implying that the heritability was most likely due to additive gene effects. Direct selection of these traits would be advantageous for okra improvement, especially in developing a YVMV resistant genotype. Fruit yield per plant exhibited a significant and positive genotypic as well as phenotypic correlation with fruit weight, fruit length, peroxidase activity, polyphenol activity, fruit diameter, total phenolic content and plant height, whereas node at which the first flower appeared and YVMV were negatively correlated to fruit yield per plant. Correlation studies indicated YVMV resistance towards high total phenolic content, polyphenol oxidase, and peroxidase. The high positive direct effects on fruit yield per plant were observed for fruit weight followed by number of fruit per plant and total phenolic content. This study revealed that simultaneous selection of these traits can help in increasing yield and YVMV resistance.

Highlights

IntroductionMoench) is a well-known and economically valuable tropical and subtropical vegetable crop
Among the all traits studied, high PCV and GCV were observed for a number of primary branches per plant, total phenolic content, Yellow vein mosaic virus (YVMV), number of fruits per plant, polyphenol oxidase, peroxidase activity, fruit yield per plant, fruit weight (g), plant height, node at which the first flower appears, fruit length and number of ridges on fruit (Table 2)
The highest positive direct effects on fruit yield per plant were observed for fruit weight (0.7918) followed by a number of fruit per plant (0.6017) and total phenolic content (0.3996) while, plant height (0.1104) observed low direct

Summary

Introduction

Moench) is a well-known and economically valuable tropical and subtropical vegetable crop. It is a member of the Malvaceae family and has a chromosome number of 2n=130. It is rich in vitamins and minerals, calcium, potassium, fibre, and iron making it a nutrient-dense food (IBPGR, 1990). It is India’s most frequently cultivated and popular vegetable crop ranking first in the world production with 60.03 lakh tonnes with aproductivity of 12.0 tonnes ha-1 The okra cultivation in India is influenced by various biotic and abiotic factors. The most serious disease caused by biotic factors is the Yellow vein mosaic virus disease, which is transmitted by

Methods

Results

Conclusion