Thirty six hybrids of maize were developed through Line x Tester design using three male tester lines and twelve female inbred lines as parental material along with four standard checks Vivek-H-43, Pratap Hybrid Maize-3, Pratap Makka-9 and HM-11, to study combining ability in maize (Zea mays
L.). The parents, hybrids and four standard checks were evaluated during kharif
season 2016 for 15 characters. The mean square due to genotypes, parents, crosses and parents v/s crosses were significant for all the traits, except, days to 50 % tasseling, days to 50 % silking, days to 75 % brown husk, number of leaves per plant, shelling percentage and starch content. The ratio of Ïƒ2sca / Ïƒ2gca was greater than one for all the traits except days to 50 per cent silking, anthesis - silking interval and days to 75 per cent brown husk, number of leaves per plant, grain yield (per plant), starch content. This indicated that the preponderance of non-additive gene effects in the inheritance of these traits Among female inbred lines, EI-2438 had significant GCA effects for grain yield per plant (30.71) and yield component traits like number of grain rows per ear (0.82), shelling percentage (4.27), harvest index (2.14), maturity traits like, days to 50 per cent tasseling (-1.62), days to 50 per cent silking (-1.19) and quality traits like oil content (0.34), protein content(0.39) and starch content (2.75), indicated that best general combiner for these traits, while in male parent BML-6 was the best general combiner for yield contributing traits viz., grain yield per plant (6.38), harvest index (1.53), number of grain rows per ear (0.55), and quality traits viz., oil content (0.05), protein content (0.18). Maximum positive significant sca effects for yield per plant was showed by hybrid EI-2614 x EI-586-2 (42.91) followed by hybrid EI-2306x EI-586-2 (37.98), EI-2312x BML-6 (36.33), EI-2525xEI-670-2 (26.65) and EI-2430 x EI-670-2 (18.70). Hybrid EI-2430 x EI-670-2 showed positive significant effects for most of the traits like grain yield per plant(18.70), harvest index (4.69), number of grain rows per ear (1.14), 100 â€“ grain weight (1.75), protein content(0.69).They produced significant and desirable SCA effects for most of the traits studied indicating potential for exploiting hybrid vigour in breeding programme.
Mohan Singh, RB Dubey, KD Ameta, Santra Haritwal and Bhagchand Ola. Combining ability analysis for yield contributing and quality traits in yellow seeded late maturing maize (Zea mays L.) hybrids using Line x Tester. J Pharmacogn Phytochem 2017;6(5):112-118.