Division of Botany, Indian Agricultural Research Institute, New Delhi-12
Resistance to race 15c of stem rust in the bread wheat variety N.P. 790 appears to be governed by two recessive duplicate factors located in chromosomes 1A and 2A. An excess of resistant seedlings, however, occurs in the F2 lines involving these two chromosomes and the existence of a gene dosage effect with regard to the phenotypic manifestation of disease symptoms is suggested. Resistance to race 21 was controlled by a single recessive gene located on chromosome 3D.
