Microcystins induce morphological and physiological changes in selected representative phytoplanktons.

Microbial Ecology
B Sedmak, Tina Elersek

Abstract

Dissolved microcystins (MCs) are regularly present in water dominated by microcystin-producing, bloom-forming cyanobacteria. In vitro experiments with environmentally feasible concentrations (5 x 10(-7) M) of the three most common microcystins, MC-LR, MC-RR, and MC-YR, revealed that they influence the metabolism of different representative phytoplanktons. At light intensities that are close to the cyanobacterial bloom environment (50 micromol m(-2) s(-1)), they produce morphological and physiological changes in both microcystin-producing and -nonproducing Microcystis aeruginosa strains and also have similar effects on the green alga Scenedesmus quadricauda that is frequently present in cyanobacterial blooms. All three microcystin variants tested induce cell aggregation, increase in cell volume, and overproduction of photosynthetic pigments. All three effects appear to be related to each other but are not necessarily caused by the same mechanism. The biological activity of microcystins toward the light-harvesting complex of photobionts can be interpreted as a signal announcing the worsening of light conditions due to the massive proliferation of cyanobacteria. Although the function of microcystins is still unknown, it is evident...Continue Reading

References

Jan 22, 1992·Biochimica Et Biophysica Acta·J F Allen
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Sep 8, 1998·Microbiology and Molecular Biology Reviews : MMBR·D CampbellG Oquist
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Citations

Apr 23, 2010·Marine Drugs·Ioannis SainisEvangelos Briasoulis
Mar 16, 2007·Environmental Microbiology·Daniella SchatzAaron Kaplan
Jun 14, 2013·Environmental Microbiology Reports·Moshe HarelAaron Kaplan
Nov 2, 2011·Environmental Microbiology·Nanqin GanLirong Song
Jul 28, 2016·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Leda GiannuzziMarcelo Hernando
Apr 4, 2017·Environmental Microbiology·Lucas J Stal
Feb 24, 2018·Biological Reviews of the Cambridge Philosophical Society·Man XiaoColin S Reynolds
Aug 8, 2019·Environmental Microbiology Reports·Einat DanielAaron Kaplan
Sep 1, 2020·FEMS Microbiology Ecology·Juliana Ospina-SernaFernando Unrein
Apr 26, 2020·International Journal of Environmental Research and Public Health·Magdalena ToporowskaBarbara Pawlik-Skowrońska

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