The convergence of distinct lineages upon interspecific hybridisation, including when
accompanied by increases in ploidy (allopolyploidy), is a driving force in the origin of many
plant species. In plant breeding too, both interspecific hybridisation and allopolyploidy are
important because they facilitate introgression of alien DNA into breeding lines enabling the
introduction of novel characters. Here we review how fluorescence in situ hybridisation
(FISH) and genomic in situ hybridisation (GISH) have been applied to: 1) studies of …