IMMUNOLOGICAL FEATURES OF ACTION OF THE WHEAT RESISTANCE TO LEAF RUST GENE Lr23. II. CYTOPHYSIOLOGICAL ASPECTS
Wheat gene Lr23 supplies partial (quantitative) resistance to leaf rust. Cytophysiological aspects of interactions between rust fungus and near isogenic lines of common wheat Thatcher with genes Lr23 and Lr2a (race-specific) were compared. In the tissue of Lr2a line the complex of mechanisms typical for race-specific resistance including hypersensitive reaction (HR) was appeared. In TcLr23 line tissues some colonies were aborted, other were suppressed. Key mechanism of TcLr23 line was passive inhibition of haustorial mother cell development. HR and oxidative burst were not mentioned, callose depositions appeared after abortion or suppression of the colony growth. Mycelium was partly disrupted, possibly by PR-proteins, at late stage of the pathogenesis.