An unusual sexual stage in the alkalophilic ascomycete Sodiomyces alkalinus.

Autor: Kozlova MV; Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory 1-12, 119234 Moscow, Russia; State Oceanographic Institute, Kropotkinsky Lane 6, 119034 Moscow, Russia., Bilanenko EN; Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory 1-12, 119234 Moscow, Russia., Grum-Grzhimaylo AA; Laboratory of Genetics, Wageningen University, Droevendaalsesteeg 1, 6708PB Wageningen, the Netherlands. Electronic address: alexey.grumgrzhimaylo@wur.nl., Kamzolkina OV; Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory 1-12, 119234 Moscow, Russia.
Jazyk: angličtina
Zdroj: Fungal biology [Fungal Biol] 2019 Feb; Vol. 123 (2), pp. 140-150. Date of Electronic Publication: 2018 Nov 30.
DOI: 10.1016/j.funbio.2018.11.010
Abstrakt: Exploring life cycles of fungi is insightful for understanding their basic biology and can highlight their ecology. Here, we dissected the sexual and asexual life cycles of the obligate alkalophilic ascomycete Sodiomyces alkalinus that thrives at extremely high pH of soda lakes. S.alkalinus develops acremonium-type asexual sporulation, commonly found in ascomycetous fungi. However, the sexual stage was unusual, featuring very early lysis of asci which release young ascospores inside a fruit body long before its maturation. In a young fruit body, a slimy matrix which originates from the combined epiplasm of asci and united cytoplasm of the pseudoparenchymal cells, surrounds pooled maturing ascospores. Upon maturity, the ascospores are forcibly released through a crack in the fruit body, presumably due to an increased turgor pressure. These features of the sexual stage development resemble the ones found in unrelated marine fungi, indicating convergent evolution of the trait. We hypothesise these developmental features of S. alkalinus to be adaptive in the conditions of periodically inundated rims of soda lakes where the fungus thrives.
(Copyright © 2018 British Mycological Society. Published by Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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