Assessment of Wheat Genotypes for Yield and its Components Developed through Gama Rays

An experiment was conducted to assess the advance spring wheat mutant lines for some quantitative traits in ten genotypes of wheat (Triticumaestivum L.) evolved through mutation breeding techniques along with two check varieties (NIA- Sunahri and Kiran-95). The experimental trial was conducted in the field of Plant Genetics Division, Nuclear Institute of Agriculture (NIA), Tandojam, during Rabi season 2011-2012. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The experimental material was examined for mean performance, correlation coefficient and regression coefficient of important yield components towards grain yield plant-1. The mean squares (ANOVA) and mean performances of ten wheat genotypes revealed highly significant differences at (p<0.01) level fordays to 75% heading, days to 75% maturity, spikelets spike-1, grains spike-1and grain yield of main spike, while harvest index is significant at (p<0.05) level. The trait grain yield plant-1 was positively and highly significantly associated with days to 75% heading, spikelets spike-1and grains spike-1 while significantly and positively correlated with grain yield of main spike (g), however, it was non-significantly associated with days to 75% maturity and harvest index (%).Regression analysis showed that an increase in the days to 75% heading, days to 75% maturity, spikelets spike-1, grains spike-1, grain yield of main spike and harvest index (%) will increase grain yield plant-1 by 0.261, 0.195, 1.120, 0.376, 10.432 0.398 grams, respectively. It was, therefore, suggested that days to heading, spikelets spike-1and grains spike-1 should be given emphasis for future wheat yield improvement programs.