Additional Genes in Triticum Vulgare for Resistance to Erysiphe Graminis Tritici

Abstract

Additional genetic studies have been made of the resistance of Birdproof, Chul, and Normandie to races P and P-1 of Erysiphe graminis tritici. The presence in Birdproof of a second gene M1b, not allelic to the gene M1s previously identified in Indian, Sonora, and Sturgeon, has been confirmed. It confers resistance to both races (P and P-l) of Ervsiphe from the three-leaf stages onwards. Chul possesses a single dominant gene, M1c, for resistance to race P-l at all stages of growth. Normandie is shown to possess the Ulka gene, M1u, for resistance to both races of mildew.