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Assessment of some Sources of Adult Plant Resistance to Wheat Stem Rust in Egypt
Walid El-Orabey
Stem rust is a devastating disease of wheat in the major wheat-growing regions of the world. Particularly, the stem rust race identified as Ug99 and its mutants initially emerged in Uganda in 1999 had crossed borders of neighboring countries in Africa, Middle East and Asia has become a major threat to the world wheat industry. Therefore, the present study was conducted in the field to assess sources of resistance to stem rust. A total of 93 wheat genotypes delivered to Egypt by International Maize and Wheat Improvement Center (CIMMYT) and a susceptible cultivar; Morocco were evaluated under field conditions at the two locations i.e. Behira and Minufiya governorates during 2017/2018, 2018/2019 and 2019/2020 growing seasons. Results of the current study showed that 84 wheat genotypes were resistant and had the lowest values of FRS, ACI and AUDPC. These genotypes might possess one or more Adult Plant Resistance (APR) genes to stem rust. Therefore, the 84 genotypes that possessed APR genes can be good sources of durable stem rust resistance genes to be incorporated in the Egyptian wheat improvement breeding programs.