HETEROSIS AND COMBINING ABILITY IN OKRA [Abelmoschus esculentus (L.) Moench] 2937
dc.contributor.advisor | A. S. Jethava | |
dc.contributor.author | PITHIYA DIVYESH JAGMALBHAI | |
dc.date.accessioned | 2021-07-09T09:47:05Z | |
dc.date.available | 2021-07-09T09:47:05Z | |
dc.date.issued | 2019-08 | |
dc.description.abstract | The present investigation entitled “heterosis and combining ability in okra [Abelmoschus esculentus (L.) Moench]” was undertaken at the Vegetable Research Station, Junagadh Agricultural University, Junagadh during summer 2018. The experimental material comprised of 6 lines viz., GO-2, VRO-6, JOL-2K-19, HRB-55, HRB-108-2 and AOL-08-5; five testers namely; AOL-13-133, AOL-13-73, Kashi Kranti, EC-169513 and IC-90107; their 30 hybrids derived from line x tester mating and one check variety, GJOH-4. These 42 genotypes were evaluated in a Randomized Block Design with three replications. Observations were recorded on days to 50% flowering, days to first picking, plant height, number of branches per plant, number of nodes per plant, fruit girth, fruit length, internodal length, number of fruits per plant and fruit yield per plant. Analysis of variance revealed significant variations among the genotypes, parents and hybrids for all the ten traits. The mean squares due to parents vs. hybrid were significant for all the characters under investigation except days to 50% flowering and fruit girth. The magnitude of standard heterosis in the positive direction was high for plant height and number of branches; medium for number of fruits per plant and yield per plant and low for number of nodes per plant and fruit length. Similarly, the magnitude of standard heterosis in the negative direction was high for days to 50% flowering and medium for internodal length and low for days to first picking and fruit girth. The three crosses viz., JOL-2K-19 x AOL-13-73, JOL-2K-19 x EC-169513 and GO-2 x EC-169513 manifested significant and desirable heterobeltiosis and standard heterosis. The analysis of variance for combining ability revealed that mean squares due to lines x testers were found highly significant for all the traits under study except fruit girth, it was significant. Whereas, variance due to lines and testers were found also significant for all the traits (except the line for fruit girth and tester for days to first picking, number of nodes per plant and fruit length). The magnitude of SCA variance was higher than GCA variance for all the traits indicated preponderance of non-additive gene action in the expression of yield and yield attributing traits except plant height.Abstract The results on gca effects of the parents indicated that none of the parents was found to be good general combiner simultaneously for all the characters. The estimates of gca effects of parents revealed that IC-90107 and HRB-55 for days to 50% flowering, HRB-55 and EC-169513 for days to first picking, GO-2, EC-169513 and AOL-08-5 for plant height, GO-2, JOL-2K-19, AOL-08-5, AOL-13-133 and AOL-13-73 for number of branches per plant, AOL-08-5 and IC-90107 for number of nodes per plant, HRB-108-2, AOL-08-5 and EC-169513 for internodal length, JOL-2K-19, AOL-08-5 and EC-169513 for number of fruits per plant, GO-2 and VRO-6 for fruit length, JOL-09-07, AOL-13-73 for fruit girth, EC-169513, GO-2 and JOL-2K-19 for fruit yield per plant were found good general combiners for respective traits. As regard to specific combining ability effects, the best cross combination were JOL-2K-19 x AOL-13-133 for days to 50% flowering; HRB-108-2 x AOL-13-133 for days to picking; HRB-55 x AOL-13-133 for plant height; VRO-6 x EC-169513 for number of branches per plant; JOL-2K-19 x AOL-13-73 for number of nodes per plant and number of fruit per plant; AOL-08-5 x AOL-13-73 for internodal length; AOL-08-5 x Kashi Kranti for fruit length, JOL-2K-19 x AOL-13-73 for fruit yield per plant and no one cross significant and best for fruit girth. On the basis of per se performance and heterosis over standard check, JOL-2K-19 x AOL-13-73, JOL-2K-19 x EC-169513 and GO-2 x EC-169513 were found to be the best cross combinations for fruit yield and some yield attributing traits. The crosses JOL-2K-19 x AOL-13-73 involved good x average general combiner, JOL-2K-19 x EC-169513 good x good and cross, GO-2 x EC-169513 good x good general combiner. This was also true for some yield components. Such crosses appeared to be suitable for exploitation in practical plant breeding. From the present findings, it can be concluded that sufficient variability was present in the materials studied for yield and its components. The non-additive gene action was observed in the inheritance of fruit yield and other yield associated traits except plant height. This suggested that heterosis breeding would be more suitable for the improvement of these traits in okra. | en_US |
dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810170321 | |
dc.keywords | Heterosis, Combining ability, Gene action, Okra | en_US |
dc.language.iso | English | en_US |
dc.pages | 121p | en_US |
dc.publisher | JAU, JUNAGADH | en_US |
dc.sub | Genetics and Plant Breeding | en_US |
dc.theme | HETEROSIS AND COMBINING ABILITY IN OKRA [Abelmoschus esculentus (L.) Moench] 2937 | en_US |
dc.these.type | M.Sc | en_US |
dc.title | HETEROSIS AND COMBINING ABILITY IN OKRA [Abelmoschus esculentus (L.) Moench] 2937 | en_US |
dc.type | Thesis | en_US |
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