GENETIC INHERITANCE OF YELLOW VEIN MOSAIC VIRUS RESISTANCE AND YIELD COMPONENT STUDIES IN OKRA (Abelmoschus esculentus (L.) Moench)
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Date
2017-10
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University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bengaluru)
Abstract
Okra (Abelmoschus esculentus (L.) Moench) is an annual crop belonging to the family Malvaceae. The total production of okra is drastically reduced due to various biotic and abiotic stresses. The present investigation was carried to understand the magnitude and extent of genetic variability, heritability, genetic advance and path coefficient analysis between yield and its components traits and also studied the inheritance of YVMV resistance for developing high yielding resistant hybrids. The 45 genotypes exhibited large amount of variation for all the thirteen characters studied. Yield per plant was positively and significantly associated with stem girth, number of branches per plant, plant height, first fruit producing node, fruit length, fruit diameter, average fruit weight, number of fruits per plant, number of seeds per fruit and 100 seeds weight. 45 hybrids were developed by crossing 10 selected parents in half-diallel mating design. The crosses viz., IIHR-875 x IIHR-478, IIHR-478 x IIHR-567 and IIHR-604 x IIHR-347 were identified as top three best hybrids based on their yield potential. Estimation of gene effects using six parameter models revealed the interaction components to be significant in both the crosses IIHR-875 x IIHR-478 and IIHR-604 x IIHR-347, the A, B, C and D scaling tests indicated presence of non-allelic interaction among the components. The parents, F1, F2 and back cross generations (B1 and B2) of the crosses were sown at ‘Natural Hot Spot’ area in order to know the inheritance pattern for Yellow Vein Mosaic Virus (YVMV) resistance. In cross, IIHR-875 x IIHR-478 the Chi-square analysis disease incidence confirmed that, the F2 population segregates into 3 (resistant): 1 (susceptible) ratio plant indicating that single dominant gene governs the YVMV resistance. Whereas in cross, IIHR-604 x IIHR-347, the F2 population segregates into 15 (resistant): 1 (susceptible) ratio plant indicating that duplicate dominant gene governs the YVMV resistance.