Cummings Laboratory, Indian Agricultural Research Institute, New Delhi, 110 012, India
2Present address: Department of Plant Breeding, G. B. Pant University of Agriculture & Technology, Pantnagar, 263 145, Distt. Nainital, U.P.
1Part of the thesis submitted by senior author for the award of Ph.D. degree at IARI, New Delhi.
Bi-parental progenies (Design-1) were developed in an opaque-2 composite at 25, 50, and 100-thousand plants per ha (A, B, and C) and each of these three groups of progenies were further evaluated at similar plant densities (a, b, and c) to determine estimates of genetic variance, and genetic advance for grain yield and other agronomic traits during 1971 and 1972. Marked variation for additive and dominance variance was observed for all the characters at different sub-levels. Increase in dominance variance and error variance at increasing levels of plant densities at evaluation was recorded. Additive genetic variance also declined for number of characters at high plant density of evaluation (c). Different levels of progeny development did not exhibit any consistent pattern. Cc level which recorded maximum grain yield among different sub-level had high proportion of dominance variance, and 38∙8 percent heritability and 14∙9 percent genetic advance.
