ARTICLE 37 et IMA FUNGUS · 9(1): 37–48 (2018) 37–48 · 9(1): FUNGUS IMA Fusarium species, including those in et al. 2004b). Key words: evolutionary history FFSC mitochondrial recombination heteroplasmy-associated hybridization introgression species concepts The mitochondrial (mt) genome is potentially a valuable material into the genome of that parental species. The species. material into the genome of that parental into the gene process of introgressing new genetic material hybridization” pool of a species is referred to as “introgressive interspecies gene (Anderson & Hubricht 1938). In nature, \ pheromone- mechanisms, such as vegetative incompatibility, post-zygotic nuclear- receptor recognition, intersterility and restrict or prevent cytoplasmic incompatibility systems that species (Giraud the exchange of genetic material between et al 2008). In many the FFSC, laboratory-based mating studies have shown that the level of reproductive isolation is not complete and that various species are capable of interbreeding (Desjardins al. 2000, Leslie tool for studying hybridization and introgression in fungi. Fungal mitochondria are mostly inherited from the maternal 1986), but cross-species interactions would parent (Taylor often lead to a short-lived heteroplasmic state in which the hybrid individual would harbour mt haplotypes from both parents (Ballard & Whitlock 2004, Barr et al. 2005). haplotypes would Recombination between the different cause the introduction and/or replacement of new genes/ regions on one or both mt genomes. Such signatures of the ancestral cross-species interactions thus would be retained genes, suggests ) (Geiser Incongruence observed Incongruence observed et al. 2010, F. oxysporum F. Fusarium. species complex) is species (e.g. species complex species 2009). Previous work suggests that species complexes) (Ma
species complex (FFSC) is an economically Fusarium fujikuroi species complex (FFSC) et al. 2013) and that its evolutionary history could et al. 2000a) and, in the FFSC, was suggested to The