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Stem rust of wheat, caused by Puccinia graminis f.sp. tritici, is the most damaging rust among wheat rusts and the damage caused by the disease can be reached to complete destruction of wheat fields. The disease, historically one of the most important diseases of wheat in Iran, has re-emerged over the past decade and threatens wheat production in several parts of the country. In the present project, the reaction of 144 elite wheat genotypes from the SPII national wheat breeding programs in 2015 were determined to stem rust at seedling stage in the greenhouse and during two cropping seasons of 2014-15 and 2015-16 under field contamination in Kelardasht, Mazandaran. The results of seedling stage tests showed that the three genotypes of 4, 10, and 20 from the North warm and humid climate (ERWYT-N-94), two genotypes of 14 and 25 from the South warm and dry climate (ERWYT-S-94), the genotype number 2 from the salinity (ERWYT-MS-94), three genotypes of 8, 15, and 17 from the warm durum (ERDYT-W-94), and four genotypes of 1, 3, 15, and 20 from the moderate durum (ERDYT-M-94) wheat programs, had a high level of resistance to all five stem rust fungal isolates tested. The results of adult-plant tests showed that 13 genotypes of 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 18, and 19 from the ERWYT-N-94, five genotypes of 16, 20, 22, 25, and 27 from the ERWYT-S-94, and two genotypes of 10 and 15 from the ERWYT-MS-94 wheat programs were resistant to the disease. In addition, the two genotypes of 4 and 10 from the ERWYT-N-94 and the genotype number 25 from the ERWYT-S-94 were determined as resistant wheat genotypes to stem rust at both seedling and adult-plant stages. Data collected from this project were provided to Cereal Research Department (CRD), SPII, to use in national wheat breeding programs.Keywords: Wheat, elite, stem rust, Puccinia graminis f.sp. tritici, resistance
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