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CHARACTERIZATION AND EVALUATION OF INBRED LINES OF OKRA [Abelmoschus esculentus (L.) Moench]

KrishiKosh

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Title CHARACTERIZATION AND EVALUATION OF INBRED LINES OF OKRA [Abelmoschus esculentus (L.) Moench]
 
Creator VISHNU PRIYANKA D
 
Contributor Dr. M. THIRUPATHI REDDY
 
Subject high nutritional, medicinal, industrial and economic values, productivity potential and economic viability , YVMV resistance and superior pod quality attributes,Genetic divergence analysis ,Genotypic path coefficient analysis
 
Description Okra (Abelmoschus esculentus (L.) Moench) is a traditional pod vegetable crop of high nutritional, medicinal, industrial and economic values in India. The productivity potential and economic viability of okra in tribal, rural and periurban vegetable farming systems is low owing to the low yielding potential, susceptibility to yellow vein mosaic virus (YVMV) and sub-optimal pod quality. The productivity potential and economic viability of okra systems can be enhanced by the development of advanced varieties having high yield potential coupled with YVMV resistance and superior pod quality attributes. A set of 25 inbred lines (RNOYR-30 to RNOYR-54) along with one YVMV resistant check (RNOYR-16), one YVMV susceptible check (RNOYR-19) and two commercial checks (Arka Anamika and Pusa Sawani) were characterized for 18 qualitative traits and evaluated for 18 quantitative traits in a randomized block design with 3 replications at Vegetable Research Station, Dr. Y. S. R. Horticultural University, Rajendranagar, Telangana, India during summer, 2014 to identify the horticulturally superior inbred lines on the basis of their production potential, YVMV resistance and superior pod quality attributes, to identify the diverse inbred lines, to determine the yield components and suitable selection methods. The analysis of variance of RBD revealed highly significant differences for all agro-economic traits indicating presence of great amount of variability in the material under study. On the basis of production potential for various agroeconomic traits including marketable pod yield per plant, resistance to YVMV and acceptable pod quality attributes, the inbred lines RNOYR-54 (399.93 g of marketable pod yield per plant and zero percent YVMV incidence), RNOYR-51 (383.67 g of marketable pod yield per plant and zero percent YVMV incidence) and RNOYR-37 (320.58 g of marketable pod yield per plant and zero percent YVMV incidence) were found to be horticulturally superior, which can be either
exploited for commercial cultivation after multi-environment testing or utilized in the future breeding programmes for the development of advanced open pollinated varieties or F1 hybrids in okra. Genetic divergence analysis following Mahalanobis D2 statistics and Tocher’s method revealed distinct clustering pattern with 5 clusters and considerable genetic diversity in the material under study. The characters YVMV infestation, fruit length and days to 50% flowering with high per cent of contribution to total divergence (55.17%, 14.29% and 8.62%, respectively) were the potent variables in differentiating the breeding material under study. The use of diverse inbred lines from the divergent clusters with high intercluster distance (cluster III and IV, I and III and clusters II and III) in hybridization is expected to result in high heterosis and throw desirable transgressive segregants. Genetic variability analysis revealed high magnitude of genetic variability and high degree of transmission of majority of the growth, earliness and yield associated traits under study. High magnitude of genotypic coefficient of variation (>20%) for number of marketable fruits per plant, marketable yield per plant and yellow vein mosaic virus infestation indicated high degree of genetic variability offering great scope for selection of these characters. High heritability (>60%) coupled with high expected genetic advance (>20%) for number of marketable fruits per plant, marketable yield per plant and yellow vein mosaic virus infestation indicated the involvement of additive gene action and more chances of fixing by selection to improve such traits. Phenotypic and genotypic correlation coefficient analysis revealed positively significant association of number of branches per plant, days to last fruit harvest, fruiting period and number of marketable fruits per plant and total yield per plant and negatively significant association of yellow vein mosaic virus infestation with marketable yield per plant. Genotypic path coefficient analysis revealed that number of branches per plant, days to 50% flowering, days to first fruit harvest, fruiting period, fruit length, total number of fruits per plant, number of marketable fruits per plant, pod borer infestation and yellow vein mosaic virus infestation are the key agro-economic traits having high to very high genotypic direct effect on marketable yield per plant and are thus identified as yield components in okra. From the correlation and path coefficient analysis, it is evident that direct selection for number of branches per plant and number of marketable fruits per plant, indirect selection for fruiting period and restricted simultaneous selection for yellow vein mosaic virus infestation are effective in okra.
 
Date 2016-07-26T11:17:38Z
2016-07-26T11:17:38Z
2014-10
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69881
 
Language en
 
Format application/pdf
 
Publisher Dr. Y.S.R. HORTICULTURAL UNIVERSITY