HETEROSIS AND COMBINING ABILITY IN OKRA (Abelmoschus esculentus (L.) Moench)
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Date
2014-05
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VEGETABLE SCIENCE DEPT., ASPEE COLLEGE OF HORTICULTURE AND FORESTRY, NAVSARI AGRICULTURAL UNIVERSITY, NAVSARI
Abstract
The present investigation on half diallel analysis was conducted in okra to study the magnitude of heterosis and combining ability in okra for fifteen plant characters including fruit yield per plant and its component characters. The experimental material comprising of seven genetically diverse parental lines and their twenty one hybrids (excluding reciprocals) were planted in randomized block design with three replications during summer-2013 at the Regional Horticultural Research Station, ASPEE College of Horticulture and Forestry, Navsari Agricultural University, Navsari, Gujarat. The analysis of variance revealed highly significant differences among parents for internodal length, number of fruits per plant, stem diameter, fruit yield per plant, fruit length, number of seeds per fruit and fiber content and among hybrids for plant height, days to first flowering, internodal length, number of fruits per plant, stem diameter, fruit yield per plant, fruit length, stalk length, number
of seeds per fruit and fiber content indicating presence of considerable amount of genetic variability in the material tested. Significant standard heterosis and high per se performance with regards to fruit yield per plant and its components were recorded by GAO-5 X AOL-09-02, AOL-09-17 X AOL-09-02 & GAO-5 X AOL- 09-17 in positive direction. Combining ability analysis revealed that both additive as well as non additive effects were important in the inheritance of all the traits studied. However, magnitude of general combining ability (GCA) variance were smaller than specific combining ability (SCA) for all the characters except days to first flowering indicating the preponderance of non additive gene effect. Parents viz., AOL-09-02, AOL-09-17 & GAO-5 were good general combiner for fruit yield per plant which had also the good GCA effects for the yield attributes like plant height, internodal length, number of fruits per plant, number of seeds per fruit, 100 seed weight and fiber content. The crosses viz., GAO-5 X AOL-09-02, AOL-09-17 X AOL-09-02 & GAO-5 X AOL- 09-17 expressed significant SCA effects for fruit yield per plant and its attributing characters involving good x good parental interaction for all hybrids. Cross GAO-5 X AOL-09-02 had high mean performance for fruit yield per plant involving parents with good x good GCA effects and also having significant SCA effects for plant height, number of branches per plant, number of fruits per plant, 100 seed weight & fiber content.
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