Department of Genetics and Plant Breeding, Faculty of Agriculture, Annamalai University, Annamalai Nagar, India
A half diallel se involving six rice genotypes was used to study the inheritance of grain yield and its component characters in rice. Data from the F1 generation and parents were analyzed using Hayman (1954) method of diallel analysis. The estimates of D (additive genetic variance) were significant for all the traits studied. The values of H1 and H2 as well as H2/4H1 indicated that there were unequal frequencies of the alleles at all the loci. An excess of dominant alleles was involved in five out of the ten traits of interest. The mean degree of dominance was more than unity for six out of the 10 traits studied, including grain yield per plant. The narrow sense heritability estimates were high for eight out of the ten traits studied.
Oryza sativa, diallel mating design, genetic parameters, heritability
