Identification of Aegilops ovata chromosomes added to the wheat (Triticum aestivum L.) genome

A partial amphiploid Triticum aestivum cv. 'Chinese Spring' x Aegilops ovat a was backcrossed to 'Chinese Spring' to produce wheat-Ae. ovata addition l ines. Using the chromosome N-banding technique five different Ae. ovata chr omosomes were identified as additions to the wheat genome in the backcross- derivatives. Plants with 2n=43 carried either single alien chromosome as mo nosomic addition, or mole than one alien chromosomes as addition-substituti on. The 44-chromosome plants were identified as disomic additions, double m onosomic additions, or addition-substitutions. Some of the alien chromosome s had modified heterochromatin structure in comparison with the correspondi ng chromosomes of the Aegilops ovata parent.