BYRE GOWDA, M.VANISHREE2017-07-112017-07-112014-07-10Th-10942http://krishikosh.egranth.ac.in/handle/1/5810024939An investigation was conducted in pigeonpea during 2012 and 2013 at UAS, GKVK, Bangalore to explore restorers/maintainers for A2 and A4 cytoplasm-based CMS lines; to identify CMS lines and restorers with desirable gca and hybrids with desirable sca and heterosis; to assess the effects of male sterility inducing cytoplasm on yield and its components; to compare the performance of single cross hybrids (SCH) and double cross hybrids (DCH) and, to predict and validate DCH performance; and to study the relationship of parental diversity with hybrids sca and mid-parent heterosis. Sixteen out of 78 genotypes tested, restored the fertility of A2 cytoplasmbased CMS lines, BRG 1A and Hy 3CA while three out of 36 genotypes, restored the fertility of A4 cytoplasm-based CMS lines, BRG 1A, BRG 3A and Hy 3CA. Of the three A2 cytoplasm-based CMS lines and three restorers, the CMS line Hy 3CA and restorer GRG 206 recorded good gca for seed yield. Out of nine A × R hybrids, Hy 3CA × GRG 206, BRG 1A × GCB 15 and BRG 1A × GRG 206 were heterotic for yield. Male sterility inducing cytoplasm significantly influenced hybrids mean performance and mid-parent heterosis for length of inflorescence and 100 seed weight, while it did not have significant effect on the sca effects for any of the characters. The genotypes BRG 10-2 and BRG 11-1 were good general combiners for most of traits including yield. Among 28 SCH, CoRG 9701 × RKVT 261 and BRG 10-2 × CoRG 9701 were best specific combinations for pods per plant and seed yield. There was good agreement between realized and predicted performances of DCH for all the characters except seed yield. The relationship of parental divergence with hybrid sca effects and mid-parent heterosis was poor enough to have any predictive power of parental divergence.ennullThesis