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Maintaining heterokaryosis in pseudo-homothallic fungi

Abstract : Among all the strategies displayed by fungi to reproduce and propagate, some species have adopted a peculiar behavior called pseudo-homothallism. Pseudo-homothallic fungi are true heterothallics, i.e., they need 2 genetically-compatible partners to mate, but they produce self-fertile mycelium in which the 2 different nuclei carrying the compatible mating types are present. This lifestyle not only enables the fungus to reproduce without finding a compatible partner, but also to cross with any mate it may encounter. However, to be fully functional, pseudo-homothallism requires maintaining heterokaryosis at every stage of the life cycle. We recently showed that neither the structure of the mating-type locus nor hybrid-enhancing effect due to the presence of the 2 mating types accounts for the maintenance of heterokaryosis in the pseudo-homothallic fungus P. anserina. In this addendum, we summarize the mechanisms creating heterokaryosis in P. anserina and 2 other well-known pseudo-homothallic fungi, Neurospora tetrasperma and Agaricus bisporus. We also discuss mechanisms potentially involved in maintaining heterokaryosis in these 3 species.
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Submitted on : Friday, February 26, 2021 - 2:36:54 PM
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Pierre Grognet, Philippe Silar. Maintaining heterokaryosis in pseudo-homothallic fungi. Communicative and Integrative Biology, 2015, 8 (4), pp.e994382. ⟨10.4161/19420889.2014.994382⟩. ⟨hal-03153541⟩



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