DETECTION OF INTERCHROMOSOMAL TRANSLOCATIONS WITHIN THE TRITICEAE BY RFLP ANALYSIS

Twenty-three wheat/alien addition or substitution lines were screened using restriction fragment length polymorphisms for the presence or ab sence of 4/5 and 4/7 reciprocal translocations in the alien chromosome s. Such translocations have previously been identified in wheat and ry e. Group 4 and group 5 Aegilops umbellulata, Triticum urartu, and Thin opyrum bessarabicum chromosomes were found to carry 4/5 translocations . Evidence for a 4/7 translocation was also found in Secale montanum. The presence of the 4/5 translocations in T. urartu indicates that the translocation predates the polyploidization of wheat. The implication s of these results are discussed.