This rye chromosome
arm carries genes Lr26, Sr31, Yr9 and Pm8 conferring
race-specific resistance to leaf rust (Puccinia recondita
f. sp. tritici), stem rust (Puccinia graminis f. sp. tritici),
stripe rust (Puccinia striiformis f. sp. tritici) and powdery
mildew (Erysiphe graminis f. sp. tritici), respectively.