DIALLEL ANALYSIS OVER ENVIRONMENTS AND STABILITY PARAMETERS IN BRINJAL (Solanum melongena L.)

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dc.contributor.advisorKathiria, K. B.
dc.contributor.authorRAO, Y. SUNEETHA A.
dc.date.accessioned2018-04-25T09:35:58Z
dc.date.available2018-04-25T09:35:58Z
dc.date.issued2003
dc.description.abstractThe present investigation entitled "Diallel analysis over environments and stability parameters in brinjal {Solanum melongena L.)" was undertaken at Main Vegetable Research Station, Gujarat Agricultural University, Anand during three consecutive seasons i.e., summer 2001, kharif-rabi 2001-2002 and summer 2002. The experimental material comprised of 10 elite homozygous lines, namely, KS 224, JB 64-1-2, AB 98-10, AB 98-13, PLR 1, Gandhinagar Local, Bombay Gulabi, Morvi 4-2, Surati Ravaiya and JBPR 1; their 45 hybrids derived from half diallel mating and hybrid check GBH 1. These'|6 genotypes were evaluated in a randomized block design with three replications in all the three environments. Observations were recorded on fruit yield per plant, days to first picking and yield component characters namely plant height, plant spread, primary branches per plant, fruit length, fruit diameter, fruit weight, fruits per plant, 1000-seed weight and leaf area per plant, in addition to the quality traits, like dry matter, total soluble sugars and total phenols. The analysis of variance for individual environments and pooled, revealed significant variation among the genotypes for all the traits studied, indicating the existence of sufficient variability in the material under study. The mean squares for genotypes x environments interaction were also found significant for fruit yield, its attributes and quality traits, indicating a variable response of the genotypes under different environments. Considerable level of heterosis was observed in the present study for fruit yield, yield components and quality traits. Maximum heterosis was observed for total soluble sugars, followed by total phenols, fruits per plant and fruit weight. However, varying magnitudes of heterosis was noticed for various traits in different environments, due to the presence of genotype x environment interactions. The mean sum of squares for general and specific combining ability were observed to be highly significant for all the traits studied. The gca:sca variance ratio indicated the predominant role of non-additive gene action for the inheritance of fruit yield and majority of the traits studied, favoring heterosis breeding programme for improvement of these traits. However, a variation in the predominant gene action with the envirormient involved was observed for the traits, namely, fruit length, fiiiit diameter, fi-uit weight and number of fi-uits per plant. Non-additive gene action was observed to be predominant for these traits during summer 2001 and summer 2002, while additive gene action was predominant during kharifrabi 2001-2002. The study of general combining ability effects revealed PLR 1 and JBPR 1 to be good combiners for fruit yield per plant and number of fruits per plant; Surati Ravaiya for plant spread, primary branches per plant, fruit length, fruit diameter, fruit weight and total soluble sugars; Morvi 4-2 for earliness, fruit diameter, fruit weight and total soluble sugars; Bombay Gulabi for plant height, fruit weight and leaf area per plant; AB 98-10 for earliness, fruits per plant and dry matter; KS 224 for earliness; JB 64-1-2 for dry matter; and Gandhinagar Local for 1000-seed weight, during all the seasons studied. A close relationship was also noticed between per se performance and gca effects of the parents. The study of specific combining ability revealed significant and desirable effects for PLR 1 X JBPR 1, JB 64-1-2 x AB 98-13, AB 98-13 x Bombay Gulabi and Morvi 4-2 x Surati Ravaiya for finiit yield per plant during all the seasons along with some of component traits in different envirormients. On the other hand, AB 98-13 x JBPR 1 and PLR 1 X Morvi 4-2 exhibited high sea effects for fruit yield per plant during kharif-rabi season. An analysis of gca effects of parents of these elite crosses revealed maximum number of hybrids to involve at least one good combiner parent for fruit yield per plant. Studies on the genotypes x environments interaction effects revealed significant mean squares indicating variable expression of the traits in the different environments. The results on envirormiental index revealed kharif-rabi season to be most congenial for fruit yield per plant and majority of fruit characters, in addition to days to first picking, plant height, 1000-seed weight and leaf area per plant. Further, the partitioning of environments +(genotypes x envirormients) mean squares revealed higher magnitudes of environments (linear) and genotypes x environments (linear) components, indicating that predictable component accounted for the major part of total variation observed for fruit yield per plant, plant spread, primary branches per plant, 1000-seed weight, dry matter, total soluble sugars and total phenols. Studies on the stability of the genotypes also indicated greater number of genotypes with predictable response for iruit yield and majority of yield component characters studied. Among these, genotypes exhibiting specific adaptability to the envirormients studied were observed to be higher in number, compared to the widely adapted genotypes. Recurrent selection by inter mating of the most desirable segregants followed by selection is advocated for development of open pollinated varieties in the crop to utilize the additive and non-additive genetic variances observed in the inheritance of the various traits studied. However, heterosis breeding programme is suggested for the improvement of fiiiit yield and majority of the traits, since non-additive variance was observed to be predominant. The hybrid, PLR 1 x JBPR 1 was identified for commercial exploitation during both kharif-rabi and summer seasons, based on its per se performance, heterosis, combining ability and stability, while the hybrids KS 224 x Bombay Gulabi, AB 98-10 x JBPR 1, AB 98-13 x JBPR 1 and Morvi 4-2 x Surati Ravaiya were identified for commercial exploitation during kharif-rabi season. Isolation of desirable segregants from advance generations of these promising hybrids involving at least one good combiner is also suggested for the development of improved varieties. Among the parents, PLR 1 and JBPR 1 were identified as good general combiners for utilization in the crop improvement programmes.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810044559
dc.keywordsDIALLEL ANALYSIS OVER ENVIRONMENTS, STABILITY PARAMETERS IN BRINJAL (Solanum melongena L.)en_US
dc.language.isoenen_US
dc.publisherAAU, Ananden_US
dc.research.problemDIALLEL ANALYSIS OVER ENVIRONMENTS AND STABILITY PARAMETERS IN BRINJAL (Solanum melongena L.)en_US
dc.subGenetics and Plant Breedingen_US
dc.subjectPLANT BREEDING AND GENETICS, AGRICULTUREen_US
dc.subjectAN ANALYSISen_US
dc.themeDIALLEL ANALYSIS OVER ENVIRONMENTS AND STABILITY PARAMETERS IN BRINJAL (Solanum melongena L.)en_US
dc.these.typePh.Den_US
dc.titleDIALLEL ANALYSIS OVER ENVIRONMENTS AND STABILITY PARAMETERS IN BRINJAL (Solanum melongena L.)en_US
dc.typeThesisen_US
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