Wheat/Agropyron 7D/7Ag recombinant chromosomes were analysed by Southern blotting, using cDNA radioactive probes corresponding to the Ssl and Ss2 sucrose synthase genes of wheat. The genes were located in the central segments of the short arms of both chromosomes 7D and 7Ag. A similar analysis of wheat/barley addition lines demonstrated that DNA sequences that cross-hybridized with the wheat probes were located in chromosome 7H of barley
