Abstract
The expression of resistance to stripe rust of wheat, conditioned by four Aegilops squarrosa (DD, 2n = 14) and 11 Triticum turgidum subsp. dicoccoides (AABB, 2n = 28) accessions, was studied by testing 22 synthetic hexaploids (AABBDD, 2n = 42) with five stripe rust races in the seedling stage and two races in the adult plant stage. Resistance in one or both parents was frequently suppressed in the synthetic hexaploids, indicating the presence of suppressor genes on the AB and D genomes. Specificity was apparent because the putative suppressor genes affected the expression of specific resistance genes, although not with all races nor in all growth stages. The results and data from F 1 and F 2 populations derived from crosses between two synthetic hexaploids with the same T. t. dicoccoides parent but with different A. squarrosa parents revealed that several recessively inherited suppressor genes on the D genome seemed to be involved. A possible mechanism explaining these results and the variable mode of action of suppressors are discussed
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