Effect of different selection methods on character association in derived populations of sunflower

摘要

The effect of different selection procedures viz., two cycles of mass selection and one cycle of S, selection on character association was probed by studying the shift in correlation coefficients as well as path analysis. After imposition of two cycles of mass selection, the correlation coefficients of plant height, number of leaves and oil yield with seed yield increased from base population to derived populations in both early (MSE-2) and medium (MSM-2) maturity groups. As in mass selection, the S-1 selection derived population also showed higher values of correlation coefficients for plant height, head diameter and oil yield with seed yield compared to the base population. The changes in path coefficients under different selection methods did not show any definite trend. However, the direct effects of seed yield on oil yield increased drastically as a result of one cycle of mass selection in both the groups. In S-1 selected progenies, on oil yield, direct effect of seed yield was high.