Evaluating resistance to puccinia recondita tritici in mutant lines selected in wheat after mutagenic treatments

Testing the “old” micro-mutant lines from M₁₂ to M₁₆ generations, which were selected for characters other than disease resistance, revealed that variability in leaf-rust resistance was maintained between lines and within them. The variability of severity of infection by specific races was found in the mutant lines at the level of sublines. In the field, significant variability of the severity of infection and tolerance of infection appeared at the level of lines. Mutants in the type of infection were rare. They appeared in two lines at the level of sublines.