Non-canonical inheritance of powdery mildew resistance in common wheat introgressive lines

Abstract

Aim. Determine the nature of inheritance of powdery mildew resistance in common wheat introgressive lines developed with Aegilops species. Methods. Interline crossing, individual assessment of plants for resistance to powdery mildew, modeling of phenotypic classes ratios. Results. Empirical segregation for the trait susceptibility/resistance to powdery mildew in F2 and backcross plants from the crosses of introgressive lines of common wheat and its cultivars were characterized by ultra high frequency of appearance of susceptible plants. Susceptible plants appeared among progeny of resistant parents, and in backcross populations from crossing of resistant F1 hybrids with resistant crossing component. Considering influence of gametes formation with different chromosome numbers and zygotes with different viability on segregation ratios did not gave the possibility to develop adequate model of inheritance. Conclusions. Inheritance of powdery mildew resistance of wheat plants, which is controlled by alien resistance genes could not be modeled on the basis of traditional combinatorics of alternative alleles in hybrids without information about the expression of the gene of interest on molecular level.
 Keywords: wheat introgressive lines, powdery mildew, inheritance model, aneuploid gamets.