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Intensive breeding has led to a narrowing in the genetic base of our major crops. In wheat, access to the extensive gene pool residing in its many and varied relatives (some cultivated, others wild) is hampered by the block on recombination imposed by the  Ph1 (Pairing homoeologous 1)  gene. Here, the  ph1b  mutant has been exploited to induced allosyndesis between wheat chromosomes and those of both  Hordeum vulgare  (cultivated barley) and  H. chilense  (a wild barley). A number of single chromosome  Hordeum  sp. substitution and addition lines in wheat were crossed and backcrossed to the  ph1b  mutant to produce plants in which pairing between the wheat and the non-wheat chromosomes was not suppressed by the presence of  Ph1 . Genomic  in situ  hybridization was applied to almost 500 BC 1 F 2  progeny as a screen for allosyndetic recombinants. Chromosome rearrangements were detected affecting  H. chilense  chromosomes 4 H  ch   , 5 H  ch   , 6 H  ch   , and 7 H  ch    and  H. vulgare  chromosomes 4 H  v   , 6 H  v   , and 7 H  v   . Two of these were clearly the product of a recombination event involving chromosome 4 H  ch    and a wheat chromosome.

The use of the ph1b mutant to induce recombination between the chromosomes of wheat and barley