Evaluation of pigeonpea [Cajanus cajan (L.) Millsp.] hybrids for heterosis, combining ability, wilt and sterility mosaic diseases
Abstract
An experiment was carried out using three cytoplasmic-genetic male sterile (CGMS) lines as females and four diversified testers as males in a line × tester design. The analysis of variance for combining ability showed that the mean squares due to general and specific combining ability effects indicated involvement of both additive and non additive gene action. The mean sum of squares due to lines × testers and their interactions were highly significant for seed yield and it’s component characters further indicated the importance of sca variance, and consequently the non-additive genetic variation in the inheritance of these characters are more likely to be improved through heterosis breeding. The gca effects of parents revealed that female lineTS-3RA was good general combiners with JKM-197 and ASHA for seed yield and it’s direct components. Crosses exhibiting high specific combing ability effects along with their per se performance, standard heterosis and gca status of the parents indicated that the cross combinations MARUTI-A x ASHA, WRP-1A x GC-11-39 and TS-3RA x JKM-197 were good specific combiners for seed yield. These parental combinations are being used for exploitation of hybrid vigour.Two hybrids TS-3RA x GRG-2009 and WRP-1A x GRG-2009 were moderately resistant for both the diseases with per cent disease incidence value of 3.57 and 25.00 for Fusarium wilt and 16.00 and 15.79 for sterility mosaic disease (SMD) respectively.
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