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Genomic instability can be induced by nascent allopolyploidization in plants. However, most previous studies have not defined to what extent the allopolyploidy-induced rapid genomic instability represents a general response, and hence important to evolution, or merely incidental events occurring stochastically in a limited number of individuals. We report here that in a newly formed allohexaploid wheat line between tetraploid wheat Triticum turgidum subsp. durum (genome BBAA) and Aegilops tauschii (genome DD) a great majority of individual plants showed chromosomal stability and exhibited a genomic constitution similar to that of the present-day Triticum aestivum (genome BBAADD). In contrast, a single individual plant was identified at S₂, which exhibited chromosomal instability in both number and structure based on multicolor genomic in situ hybridization (mc-GISH) analysis. Accordingly, this plant also …