GENETIC DIVERSITY, HETEROSIS, COMBINING ABILITY AND STABILITY ANALYSIS FOR GROWTH AND YIELD COMPONENTS IN BRINJAL (Solanum melongena L.)
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Date
2019-09-05
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K.R.C COLLEGE OF HORTICULTURE, ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
The investigation on “Genetic diversity, heterosis, combining ability and stability analysis for growth and yield components in brinjal (Solanum melongena L.)” was carried out during 2017-2019 at Kittur Rani Channamma College of Horticulture, Arabhavi. During 2017 kharif, 60 brinjal genotypes were evaluated in RCBD with two replications for genetic diversity analysis. The correlation studies revealed that fruit yield per plant had significant and positive association with plant height, number of fruits per plant, average fruit weight and fruit girth. Path analysis studies revealed that number of fruits per plant, average fruit weight and fruit length had significant positive direct effect on fruit yield per plant. The direct selection for these traits would be rewarding for improvement of fruit yield per plant. Mahalanobis D2 analysis grouped 60 genotypes of brinjal into fourteen clusters. The cluster V showed maximum intra-cluster distance and maximum inter-cluster distance was observed between clusters IV and V. Phenols contributed maximum (56.27%) to the genetic diversity followed by fruit length (21.98%), number of fruits per plant (10.96%). During 2018 summer, 24 F1’s were developed by crossing diverse eight lines and three testers by Line x Tester model for heterosis and combining ability studies. The cross HUB-8 x HUB-26 exhibited maximum standard heterosis (5.93% over Mahy Super 10 and 37.94% over Manjari) for fruit yield per plant followed by HUB-1 x CO-2 (7.28% over Mahy Super 10 and 35.97% over Manjari). The lines HUB-1, HUB-8 and testers CO-2 and HUB-13 were identified as good combiners. HUB-5 x HUB-26, HUB-6 x HUB-13, HUB-10 x CO-2 and HUB-8 x HUB-26 were identified as the good specific combiners for yield traits. Pollen viability studies proved that all genotypes had higher per cent of viable pollens that indicated the male fertility and may result in more number of seeds per fruit. During 2018 kharif, nine promising crosses were subjected to stability studies in three different locations. HUB-1 x HUB-13 and HUB-10 x CO-2 were found stable with respect to yield traits and they were well adapted to all three environments.
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