Author(s):

Dr. Shiba Supriya Demta and Dr. Supriya Supal Surin

Abstract: Crop improvement depends upon the magnitude of genetic variability present in the base population. The concept of combining ability analysis has been very useful in hybrid development. Exploitation of hybrid vigour is one of the important tools for increasing productivity. A field experiment was conducted at the Department of Horticulture BAU, Ranchi, using line x tester method of analysis (Kempthrone 1957). Experimental material was grown in Randomized Block Design (RBD) with three replications. Ten lines (female) and four testers (males) of Okra crop were crossed to estimate the combining ability and variance effects. The different characters considered were fruit yield Q/ha, plant height, height of internode, fruit per plant, fruit length and fruit weight. The results indicated that combining ability and variance effects for various traits showed a preponderance of non-additive gene action for all the characters. The lines KS-410, HRB 9-2, Parbhani Kranti, Punjab Padminiand and the testers VRO-5 and 156 Red were the superior performers for yield and its component traits with respect to general combining ability. The crosses IIVR -for fruits per plant responded significantly for specific combining ability. The crosses 155 Red X 315, HRB 9-2 X VRO-5, Parbhani Kranti X IIVR-10 were found to be superior when specific combining ability effects were considered for yield and its component traits.

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