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Wheat-rye translocations are widely used in wheat breeding to confer resistance against abiotic and biotic stress. Studying gene expression in wheat-rye translocations is complicated due to the presence of homoeologous genes in hexaploid wheat and high levels of synteny between wheat and rye chromatin. To distinguish transcripts expressed from each of the three wheat genomes and those from rye chromatin, genomic probes generated from diploid progenitors of wheat and rye were synthesized on a custom array. A total of 407 transcripts showed homoeologous genome ('A', 'B' or 'D' genome)- or rye genome ('R')-specific differential expression, based on unequal values of probe hybridization. In a 2BS.2RL wheat-rye translocation, thirteen of the 407 transcripts showed preferential expressions from rye chromatin. As well as quantifying variation in homoeologous transcript in wheat-rye translocations, this study also provides a potential aid to examine the contribution of the subgenomes to complex allohexapolyploids.

Expression analysis of individual homoeologous wheat genome- and rye genome-specific transcripts in a 2BS.2RL wheat-rye translocation