Genotypic Variability and Correlation Coefficients Relating to Grain Yield and a Few Other Quantitative Characters in Indian Wheats
Gandhi S. M., Sanghi A. K., Nathawat K. S., Bhatnagar M. P.
Agricultural Research Station, Durgapura, Rajasthan,
Genotypic variability was studied and genotypic and phenotypic correlations were worked out in a collection of ninety varieties of Indian wheats, under irrigated conditions at Agricultural Research Station, Durgapura. Genetic coefficient of variation, heritability estimates and genetic advance were computed. Ears per plant, leaf area and grain yield showed high genetic coefficient of variation. Heritability estimates were found to be large for ear number, 100-grain weight, ear length, plant height, spikelets per ear and flowering days; moderate for grain yield and leaf area and low for grains per ear. Ears per plant, 100-grain weight and ear length were found to have a high heritability and a high genetic gain and as such these traits are of considerable value to the breeder for plant selection.
In general, the genotypic correlation coefficients were found to be of the same magnitude as the phenotypic correlation coefficients. Grain yield was observed to be highly positively correlated with ears per plant, 100-grain weight and grains per ear.
With other characters, grain yield had low positive correlation. Spikelets per ear had high positive correlation with grain number per ear and days taken for flowering. Ears per plant had negative high correlation with plant height.