摘要：Wheat stem rust caused by Puccinia graminis f. sp. tritici is the most seriously disease in many coun-tries globally, inclusive of Egypt..During the two successive growing seasons 2017/18 and 2018/19. the level of slow rusting resistance to stem rust was evaluated for 32 Egyptian wheat cultivars. Four pa-rameters are used as a criteria to identify slow rusting in the field included average coefficient of infection (ACI), area under disease progress curve(AUDPC), relative area under disease progress curve(rAUDPC)and relative resistance index(RRI).In all, two wheat genotypes; Sakha 93 and Sakha 94 possess race-spe-cific resistance,19 genotypes with different levels of slow rusting resistant and the rest susceptible geno-types were included in two experiments with and without fungicide protection under high disease stress. Our results showed the highest significant value of mean 1000 kemels weight(TKW)reduction and mean test weight (TW)reduction with suscepti-ble genotypes were 21 and 22%,respectively. Cor-relation coefficient of mean TKW and TW reduction with disease parameters; ACI, AUDPC,rAUDPC and RRI were highly significant. The slow rusting genotypes showed a range of severity response indi-cating phenotypic diversity, that could be used for breeding wheat genotypes in wheat improvement programs.
关键词：Wheat;Puccinia graminis f sp Tritici;stem rust;race-spe-cific;slow rusting resistance
