Localization of induced genes for powdery mildew resistance in barley

Full text: Several mutants with changed mildew reactions have been selected after treating seeds of the variety Bomi with EMS or NaN3. Studies have so far revealed the following: All but one (E292) are inherited in a monogenic recessive manner: B1101 - partially resistant, allele of ml-o, dominant to ml-o but recessive to wild type. Yield equivalent to Bomi; N182 - partially resistant, located near Ml-g locus on chromosome 4; E202 - highly resistant, except for specific pathotypes. Large necroses. Gametic selection reduces mutant frequencies in crosses. Not located on chromosomes 4 or 5L; E61 - showing pathotype specificity, not located in or near the ml-o locus; E292 - dominant, partially resistant, poor growth habit, not located in or near the ml-o locus. Other mutants are under investigation. (author)