Abstract: Crop yield is the resultant product of components character which is not under the control of any single gene, therefore it is necessary for plant breeder to know the relationship between two traits. The present research was conducted to calculate the correlation and regression for yield and yield contributing traits in mutant population of bread wheat. The experiment was conducted at Nuclear Institute of Agriculture (NIA), Tandojam, during rabi season 2015-2016, in split plot design with three replications. Material under study was two wheat varieties (T.D-1 and ESW-9525). These two wheat varieties were evaluated along with control for yield and yield associated traits under normal field conditions. Mean square showed that there were significant differences between wheat varieties for days to 75% heading, days to 75% maturity, plant height (cm), spikelets spike-1, grains spike-1, 1000 grain weight (g), biological yield plant-1 (g), harvest index (%), spike length (cm) and grain yield plant-1 (g). Number of grains spike-1 showed positive and highly significant correlation with spike length, spikelets spike-1, 1000 grain weight and biological yield of plant-1. Significant and positive with days to 75% maturity and harvest index. However, negative correlation was found with height of plant and non-significant but negative with the trait of days to 75% heading. Grain yield plant-1 showed highly positive highly significant association with grains spike-1, number of spikelets spike-1, length of spike, harvest index and biological yield plant-1 and negative with plant height. Approximately 85.9%, 65.2%, 59% and 24.3% variation in grain yield plant-1 is due to grains spike-1, biological yield plant-1, harvest seed index and height of plant, respectively. This shows that taller plants produce lesser grain yield.
Keywords: Wheat, Correlation, Regression, Mutant, Yield..