The structure of resting bacterial populations in soil and subsoil permafrost

Astrobiology
V S SoinaGalina I El-Registan

Abstract

The structure of individual cells in microbial populations in situ of the Arctic and Antarctic permafrost was studied by scanning and transmission electron microscopy methods and compared with that of cyst-like resting forms generated under special conditions by the non-spore-forming bacteria Arthrobacter and Micrococcus isolated from the permafrost. Electron microscopy examination of microorganisms in situ revealed several types of bacterial cells having no signs of damage, including "dwarf" curved forms similar to nanoforms. Intact bacterial cells in situ and frozen cultures of the permafrost isolates differed from vegetative cells by thickened cell walls, the altered structure of cytoplasm, and the compact nucleoid, and were similar in these features to cyst-like resting forms of non-spore-forming "permafrost" bacterial strains of Arthrobacter and Micrococcus spp. Cyst-like cells, being resistant to adverse external factors, are regarded as being responsible for survival of the non-spore-formers under prolonged exposure to subzero temperatures and can be a target to search for living microorganisms in natural environments both on the Earth and on extraterrestrial bodies.

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Citations

May 10, 2007·Extremophiles : Life Under Extreme Conditions·Gaosen ZhangGuodong Cheng
Mar 22, 2006·Extremophiles : Life Under Extreme Conditions·Blaire StevenLyle G Whyte
Mar 13, 2008·Extremophiles : Life Under Extreme Conditions·Monica A PonderJames M Tiedje
Apr 23, 2013·Applied and Environmental Microbiology·Shannon M Hinsa-LeasureJanna N Schultzhaus
Oct 3, 2006·Pathophysiology : the Official Journal of the International Society for Pathophysiology·Elias Hakalehto
Jul 23, 2018·FEMS Microbiology Ecology·Johanna Donhauser, Beat Frey
Jan 27, 2019·Applied and Environmental Microbiology·Alexander BurkertRachel Mackelprang
Apr 15, 2014·Applied and Environmental Microbiology·Emanuele KuhnAlison E Murray
Sep 24, 2004·Astrobiology·Helga Stan-Lotter
Nov 5, 2014·Current Microbiology·Irena B IvshinaAndrey L Mulyukin
Sep 28, 2007·Canadian Journal of Microbiology·Gaosen ZhangGuodong Cheng
Feb 19, 2021·FEMS Microbiology Ecology·Andrey AbramovElizaveta Rivkina

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