Genomic in situ chromosome hybridization of DHBKZ. In all images, chromosomes are stained with DAPI (blue) and probed for the genomic DNA of B. napus, fluorescently labelled with rhodamine-5-dUTP (red), and the genomic DNA of B. rapa labelled with digoxigenin-11-dUTP (green). (A) Chromosomes of hybrids under light microscope, 2n-33 chromosomes. (B, C, D) GISH analysis of interspecific hybrid of B. napus x B. rapa (arrows indicate chromosomes transmitted from B. napus).