INHERITANCE OF STEM RUST RESISTANCE IN A WHEAT-RYE RECOMBINANT LINE 'SELECTION 212'

Abstract

Selection 212, a wheat-rye recombinant developed through homoeologous recombination between wheat and rye chromosomes using monosomic 5B of variety Chinese Spring was studied for inheritance of resistance against stern rust pathogen (Puccinia graminis f. sp. tritici). The F1, the F2, the h the BC1Fl and the BC1F2 generations of the crosses involving 'Selection 212' and two susceptible lines Agra Local and Chinese Spring were tested in seedlings with pathotypes 122 and 40A of P. graminis tritici. A single recessive gene that controlled resistance to both the pathotypes was determined. Correlated behaviour of the F2 backcross families of the cross (Se1.212 x AL) x AL with both the pathotypes revealed that the same resistance gene is providing resistance to pathotypes 122 and 40A. In addition, an adult plant resistance gene Sr2 was also identified.