Sharma, DeepakSarawagi, A.K.Saxena, R.R.Guhe, ArtiChoudhari, Nitin Premnarayan2017-01-272017-01-272002146 p.http://krishikosh.egranth.ac.in/handle/1/97621A study was conducted at Research Farm, Department of Plant Breeding and Genetics, Indira Gandhi Agricultural University, Raipur (Chhattisgarh), to access the variability and the GCA of parents and SCA of hybrids for yield and related characters, to evaluate the magnitude of heterosis for various traits studies, to identify the maintainers and restorers for CMS lines under study. The experimental material for the present study consisted of three CMS line, viz. IR 58025A, IR 68886A and IR 68888A and thirteen early maturing testers, viz. IR 36, IR 64, Danteshwari, Poornima, Nidhi, Vandana, Annada, Aditya, Dipti, Ratna, Rl 102-2795-3-1, R 1037-649 and CRMR 1523. Thirty nine hybrids were generated by crossing the CMS lines with testers. Thirty nine hybrids and sixteen parents were raised in a Randomised Complete Block Design (RED) with two replications. The data obtained was subjected to line x tester analysis. Combining ability analysis and heterosis was worked out for characters days to 50 per cent flowering, plant height, effective tillers per plant, number of filled grains per panicle, pollen fertility percentage, 1000 grain weight, spikelet fertility percentage, biological yield per plant, grain yield per plant and harvest index. The analysis of variance revealed the predominance of non-additive gene action for all the characters except days to 50 per cent flowering and number of filled grains per panicle, which suggested that it is possible to exploit heterosis from the present material. Among the CMS line studied, IR 5 8025A was good general combiner for biological yield per plant and IR 68886A was good general combiners for plant height and 1000 grain weight, whereas IR 68888A was best general combiner for days to 50 per cent flowering, effective tiller per plant, number of filled grains per panicle, spikelet fertility percentage pollen fertility percentage, grain yield per plant and harvest index. Testers Danteshwari and R 1102-2795-3-1 were good general combiner for number of filled grains per panicle, spikelet fertility percentage, pollen fertility percentage, biological yield, grain yield and harvest index. The strain Vandana was good general combiner for days to 50 per cent flowering, Annada for plant height, whereas Aditya for 1000 grain weight. The hybrids IR 58025 A/Danteshwari, IR 68888A/Danteshwari and IR 68888A/R 1102-2795-3-1 were best specific combiner for grain yield. These hybrids also exhibited high magnitude of relative heterosis, heterobeltiosis and standard heterosis (over IR 64) for grain yield. These hybrids offers greater scope for exploitation of hybrid vigour at commercial level. Based on pollen and spikelet fertility, Annada was found effective maintainer for CMS lines IR 58025A and IR 68886A but partial restorer for IR 68888A. Tester Danteshwari and Rl 102-2795-3-1 were found effective restorers for IR 58025 A whereas, testers Danteshwari, Nidhi and Poornima were found effective restorers for CMS line IR 68888A. The frequency of partial restorers was high.enThesis