Author(s):

Delvadiya IR, Dobariya KL, Ginoya AV and Patel JR

Abstract: Combining ability for seed yield and its component traits in castor was studied using line x tester mating design involving four diverse pistillate testers (Females) and eighteen inbred lines (males). Analysis of variance revealed that the estimates of σ²GCA were higher than the corresponding σ²SCA for days to flowering of primary raceme, plant height up to primary raceme, oil content, indicated that the preponderance of additive component of genetic variance for these traits, while for the remaining traits, non-additive component of genetic variance was predominant. Three females JP 96, JP 106 and SKP 84 and six males JI 244, SKI 215, SKI 327, SKI 392, SKI 405 and 500-2 exhibited good general combining ability effect for seed yield. The best three hybrids on the basis of significant positive sca effect for seed yield per plant were JP 106 x JI 390 (good x average combiners), JP 96 x SKI 392 (good x good combiners) and SKP 84 x JI 244 (good x good combiners). The top high yielding hybrids JP 96 × SKI 392 (good x good combiners), JP 96 × SKI 215 (good x good combiners) and SKP 84 × JI 244 (good x good combiners), with significant heterobltiosis as well as standard heterosis, also depicted significant sca effect for seed yield per plant.

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