Hybridization between different <i>Brassica</i> allohexaploid lineages produces viable, fertile progeny but does not improve genome stability or fertility in <i>F</i> 1 hybrids

We conclude that combining different allohexaploid types via hand pollination is feasible without any extra measures to ensure embryo survival, despite the different species origins, with strong maternal genotype effects on success rate. Novel hybrids between allohexaploid lineages showed similar fertility and stability to their parents, suggesting that there is no selection against CNVs in the hybridization event, nor is there an immediate gain in seed fertility associated with an increase in heterozygosity in the allohexaploids.