Department Of Genetics and Plant Breeding, Faculty of Agriculture, Banaras Hindu University, Varanasi
Online published on 25 January, 2012.
The nature and magnitude of leaf-rust reaction was studied in two sets of diallel F1 and F2 progenies produced from intermating normal and EMS treated nine diverse and elite bread wheat strains. Both additive and non-additive components of genetic variation were found to be significant in all the populations. Resistance was found to be dominant, degree of dominance varying from 0.6565 in F2 to 1.1164 in F1, The additive genetic variance (D) increased considerably in the treated populations while the non-additive components (H1 and H2) decreased. The epistatic effects were absent. The parents S331 and Norteno possessed mostly dominant alleles while Kalyansona and WL212 possessed mostly recessive alleles. A balanced proportion of dominant and recessive alleles was revealed in Sonalika.
