Cytophysiological characteristics of resistance of Aegilops speltoides Tausch and disomic addition wheat-aegilops lines (2n=44) at the stage of seedlings against powdery mildew

A complex cytophysiological study of the resistance of Aegilops speltoides K-389 and wheat-aegilops seedings against Erysiphe graminis tritici was car ried out. Ae. speltoides proved to be very resistant at the stage of pathog en penetration and endurant to the powdery mildew after infection. The whea t-aegilops lines had varying features of resistance against the powdery mil dew but did not retain a sufficiently high resistance of Ae speltoides at t he stage of seedlings. Since the studied lines showed a high resistance in the field, their resistance appears to be determined by the genetic system of protection, predominantly at the adult wage. This should he taken into a ccount when using Ae. Speltoides as a source of resistance by controlling t he character of its expression not only at the adult state, but also at the stage of seedlings.