Transfer to Wheat of Potentially New Stem Rust Resistance Genes from Aegilops speltoides

Abstract

Stem rust resistance genes have been found in four different sources of Aegilops speltoides . These include diploid accessions AEG357-4 and AEG874-60 and the amphiploids Chinese Spring/ Ae. speltoides TA8026 and TS01. Stem rust resistance was mapped to the 2S chromosomes derived from each of these lines. The previously reported 2B-2S#3 translocation derived from AEG357-4 was found to carry two stem rust resistance genes, here temporarily named SrAes2t and SrAes3t . The resistance genes found on the 2S chromosomes each derived from TA8026, TS01 and AEG874-60 are named SrAes4t , SrAes5t and SrAes6t , respectively. Lines carrying genes SrAes2t and SrAes3t are being distributed to wheat breeding programs around the world.