Cytomixis in Brassica napus var. oleifera and Brassica campestris var. oleifera (Brassicaceae)

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During an investigation of the meiotic behavior of 11 canola cultivars (Brassica campestris and Brassica napus.), eight were found to present cytomixis between sporocytes. The percentage of cells with cytomixis was low, ranging from 0.06 to 2.55%. In two cultivars, cytoplasmic bridges without chromatin transfer between cells were higher than cytomixis. All meiotic phases from pachytene to tetrads were affected. Chromosome transfer was observed between cells in the same phase of division and also between cells in different phases of division. The amount of nuclear material transferred from one cell to the other was variable, involving, in some cases, the entire chromosome complement.