Systematic investigation of germination responses of Bacillus subtilis spores in different high-salinity environments

FEMS Microbiology Ecology
Katja Nagler, Ralf Moeller

Abstract

High-salinity environments play an increasingly important role in ecology regarding soil salinization due to human-induced processes, but also need to be considered in terms of natural soil desiccation and extreme habitats. It has been shown previously that spore germination of the ubiquitous soil bacterium Bacillus subtilis is detrimentally affected by the presence of high NaCl concentrations, but the underlying mechanisms and effects of other salts remained obscure. To address these two points, we performed a systematic analysis with 32 different salts using spectrophotometric and microscopic methods. It could be shown that inhibitory strength varies considerably among different salts. Although osmotic effects seem to play an important role, ionic composition and concentration (especially of the anion) as well as chemical properties seem to be decisive for the extent of germination inhibition. At the current state of knowledge, fluxes of ions, Ca(2+)-DPA and water are likely affected by all salts, whereas the exact inhibition mechanism of each salt might further depend on the respective properties of the involved ions. Hence, the observed inhibition likely is a result of several phenomena interacting with each other. Altogeth...Continue Reading

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Citations

Jul 19, 2015·Applied and Environmental Microbiology·Katja NaglerRalf Moeller
Aug 5, 2017·Frontiers in Microbiology·Kristina Beblo-VranesevicPetra Rettberg
Apr 7, 2021·Biological Reviews of the Cambridge Philosophical Society·Jonathan AmponsahCalum R Wilson
Aug 19, 2021·Applied and Environmental Microbiology·Xiang LiQiaoyun Huang

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