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Publication . Article . Other literature type . 2020

Salt Shock Responses of Microcystis Revealed through Physiological, Transcript, and Metabolomic Analyses

Maxime Georges des Aulnois; Damien Réveillon; Elise Robert; Amandine M.N. Caruana; Enora Briand; Arthur Guljamow; Elke Dittmann; +2 Authors
Open Access
English
Published: 01 Mar 2020
Publisher: HAL CCSD
Abstract

The transfer of Microcystis aeruginosa from freshwater to estuaries has been described worldwide and salinity is reported as the main factor controlling the expansion of M. aeruginosa to coastal environments. Analyzing the expression levels of targeted genes and employing both targeted and non-targeted metabolomic approaches, this study investigated the effect of a sudden salt increase on the physiological and metabolic responses of two toxic M. aeruginosa strains separately isolated from fresh and brackish waters, respectively, PCC 7820 and 7806. Supported by differences in gene expressions and metabolic profiles, salt tolerance was found to be strain specific. An increase in salinity decreased the growth of M. aeruginosa with a lesser impact on the brackish strain. The production of intracellular microcystin variants in response to salt stress correlated well to the growth rate for both strains. Furthermore, the release of microcystins into the surrounding medium only occurred at the highest salinity treatment when cell lysis occurred. This study suggests that the physiological responses of M. aeruginosa involve the accumulation of common metabolites but that the intraspecific salt tolerance is based on the accumulation of specific metabolites. While one of these was determined to be sucrose, many others remain to be identified. Taken together, these results provide evidence that M. aeruginosa is relatively salt tolerant in the mesohaline zone and microcystin (MC) release only occurs when the capacity of the cells to deal with salt increase is exceeded.

Subjects by Vocabulary

Microsoft Academic Graph classification: Microbiology Brackish water Salinity Microcystis aeruginosa biology.organism_classification biology Intracellular Chemistry Metabolomics Microcystin chemistry.chemical_classification Microcystis Strain (chemistry)

Library of Congress Subject Headings: lcsh:Medicine lcsh:R

Dewey Decimal Classification: ddc:610

Subjects

transcript, metabolomic, salt stress, microcystin, Microcystis aeruginosa, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Microcystis aeruginosa, microcystin, salt stress, metabolomic, transcript, Health, Toxicology and Mutagenesis, Toxicology, <i>microcystis aeruginosa</i>, Article, Institut für Biochemie und Biologie

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Toxins
Article . 2020
Providers: DOAJ-Articles
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