title: Influence of extreme ambient temperatures and anaerobic conditions on Peltigera aphthosa (L.) Willd. viability.
abstract: Lichen are symbiotic systems constituted by heterotrophic fungi (mycobionts) and photosynthetic microorganism (photobionts). These organisms can survive under extreme stress conditions. The aim of this work was to study the influence of low (-70 °C) or high (+70 °C) temperatures, temperature fluctuations from +70 °C to -70 °C, and anaerobic conditions on P. aphthosa (L.) Willd. viability. None of the studied stress factors affected significantly photosynthetic and respiratory activity of the thalli. No changes in morphology or ultrastructure of the cells were revealed for both photobiont and mycobiont components after extreme temperature treatment of P. aphthosa thalli. The data show the extreme tolerance of P. aphthosa to some stress factors inherent to the space flight conditions.
authors.affiliation: Lomonosov Moscow State University, Faculty of Biology, 119992 Moscow, Russia. Electronic address: max_fungi@mail.ru.
authors.forename: M Yu
authors.initials: MY
authors.lastname: Dyakov
authors.affiliation: Lomonosov Moscow State University, Faculty of Biology, 119992 Moscow, Russia.
authors.forename: I D
authors.initials: ID
authors.lastname: Insarova
authors.affiliation: Lomonosov Moscow State University, Faculty of Physics, 119992 Moscow, Russia.
authors.forename: D E
authors.initials: DE
authors.lastname: Kharabadze
authors.affiliation: Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, 119992 Moscow, Russia; Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119334 Moscow, Russia. Electronic address: ptush@belozersky.msu.ru.
authors.forename: V V
authors.initials: VV
authors.lastname: Ptushenko
authors.affiliation: Lomonosov Moscow State University, Faculty of Biology, 119992 Moscow, Russia.
authors.forename: O V
authors.initials: OV
authors.lastname: Shtaer
mesh_terms: D015308:Anaerobic Threshold; D000693:Anaerobiosis; D001203:Ascomycota; D000460:Chlorophyta; D005453:Fluorescence; D008011:Lichens; D050296:Microbial Viability; D010788:Photosynthesis; D013559:Symbiosis; D013696:Temperature
keywords: Anaerobiosis; Extreme temperatures; Lichen; Peltigera aphthosa; Photosynthesis; Respiration