Combining ability and heterosis studies for morphological and fruit yield traits in okra [Abelmoschus esculentus (L.) Moench]
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Date
2021-09
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CCSHAU, Hisar
Abstract
The present investigation entitled ―Combining ability and heterosis studies for morphological and fruit yield traits in okra [Abelmoschus esculentus (L.) Moench]‖ was carried out at Research Farm of the Department of Vegetable Science, CCS Haryana Agricultural University, Hisar during spring-summer and rainy season of 2020 using line x tester mating design with a view to study the extent of heterosis, GCA and SCA effects in advance inbred lines of okra and to find out correlation and path coefficients for fruit yield and its attributes. The experimental material comprised of fourteen genetically diverse genotypes of okra involving twelve lines and two testers (Hisar Naveen and Hisar Unnat) and standard check HBH-142. These lines and testers were crossed using line x tester mating design during spring-summer season of 2020, to produce twenty-four F1 crosses. Analysis of variance for different quantitative characters studied during the experimentation indicated highly significant differences among the parents, crosses and commercial check at 5% and 1% level of significance. In terms of yield per hectare, four crosses viz. HB-20-3-4 x H.N, HM-1 x H.U, HBMS-1 x H.U and HB-76-2-4 x H.N showed significant positive economic heterosis over the standard check HBH-142 for yield and its contributing characters. Two lines viz., HB-20-3-4 and HM-1 showed significant positive GCA effect for yield per hectare and parents HB-20-3-4 also registered positive GCA effects for fruit length, length of peduncle, average fruit weight and number of fruits per plant. The cross HB-60-1 x H.N followed by HBMS-1 x H.U, HB-20-3-4 x H.N, HM-1 x H.U and HB-96-2 x H.U demonstrated strong SCA effects for yield and its contributing features. The ratio of general combining ability variances (σ2GCA) and specific combining ability variances (σ2SCA) was less than unity for all the seventeen quantitative traits indicated the non-additive gene effects predominated in determining the expression of all these characters and also demonstrates variability in genotypes which provide ample scope for improvement of yield and its contributing traits in okra.