HETEROSIS AND COMBINING ABILITY STUDIES IN NEAR HOMOZYGOUS LINES OF OKRA [Abelmoschus esculentus (L.) Moench]

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Date
2014-07
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K.R.C. COLLEGE OF HORTICULTURE COLLEGE OF ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT
Abstract
The investigation on heterosis and combining ability studies in okra was carried out at the department of Vegetable Science, Kittur Rani Channamma College of Horticulture, Arabhavi. Fifty four hybrids derived by crossing 18 lines with three testers were evaluated along with parents and commercial check in randomised block design and data was subjected to line x tester analysis. The magnitude of heterosis over the commercial check (MHY-10) was high in the desirable direction for total yield per plant (129.23 %), internodal length ( 111.31 %), area of index leaf ( 107.03 %), total yield per hectare ( 92.42 %), plant height at 90 days after sowing (DAS) (55.44 %), number of seeds per fruit (52.33 %), plant height at 60 DAS ( 46.18 %), number of nodes per plant (40.91 %) and average fruit weight ( 40.12 %). The hybrid which expressed maximum heterosis for total yield per hectare over the commercial check (MHY-10) was KON-8 x IC90174 (92.42 %), followed by KON-5 x AAN (45.83 %), KON-16 x AAN (40.52 %), KON-12 x AAN (35.07 %) and KON-7 x IC90174 (27.11 %). The crosses KON-8 x IC90174, KON-16 x AAN, KON-5 x AAN, KON-7 x IC90174 and KON-17 x KON-19 were identified as the good specific combiners and the lines KON-5, KON-12, KON-4, KON-8 and KON-16 were identified as the good general combiners for total yield per hectare. The parents KON-5, KON-6, KON-8, KON-12, KON-14, KON-16 and IC90174 were identified as good combiners over all characters based on comprehensive study considering gca effects of 18 characters. Non-additive gene action was predominant for number of nodes per plant and number of seeds per fruit. Non-additive genetic component was higher than additive component for nodes upto first flowering, plant height at 90 DAS, area of index leaf, internodal length, number of branches per plant, fruit length, fruit diameter, average fruit weight, number of fruits per plant, total yield per plant, total yield per hectare, number of ridges per fruit and number of locules per fruit. For improving these characters, it is suggested to follow recurrent selection or heterosis breeding.
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TH486
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