Antibiotic effects of three strains of chrysophytes (Ochromonas, Poterioochromonas) on freshwater bacterial isolates

FEMS Microbiology Ecology
Judith F Blom, Jakob Pernthaler

Abstract

We investigated the antibiotic effects of extracts of freeze-dried biomass and culture supernatants from the mixotrophic chrysophyte species Ochromonas danica, Poterioochromonas sp. strain DS, and Poterioochromonas malhamensis on bacterial strains isolated from lake water. Methanolic biomass extracts inhibited the growth of all tested strains, albeit to a different extent, whereas aqueous biomass extracts only affected bacteria of the genus Flectobacillus. The antibiotic action of supernatants from flagellate cultures could be mostly attributed to lipophilic substances, but the growth of bacteria affiliated with Flectobacillus and Sphingobium was also affected by hydrophilic compounds. A comparison of biomass extracts from light- and dark-adapted cultures of Poterioochromonas sp. strain DS showed that the growth-inhibiting factor was unrelated to chlorophyll derivatives. Supernatants from a dark-adapted, phagotrophically grown flagellate culture had stronger antibiotic effects and affected more bacterial strains than the supernatant from a light-adapted culture. Significant growth reduction of a Flectobacillus isolate was already induced by extremely low concentrations of lipophilic extracts from these supernatants. Our results...Continue Reading

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Citations

Aug 27, 2013·Systematic and Applied Microbiology·M Inés BelliniAna Fernández Scavino
Jul 27, 2010·Applied and Environmental Microbiology·Judith F BlomJakob Pernthaler
Jun 15, 2011·Bulletin of Environmental Contamination and Toxicology·Xue ZhangKirsten Seestern Christoffersen
Nov 7, 2015·Applied Microbiology and Biotechnology·Eleftherios TouloupakisGiuseppe Torzillo
Apr 22, 2010·Environmental Microbiology·Judith F BlomJakob Pernthaler
Apr 4, 2017·Environmental Microbiology·Jakob Pernthaler
May 20, 2020·Environmental Science and Pollution Research International·Hengxing TangYuan Huang
Jan 17, 2020·International Journal of Environmental Research and Public Health·Alexandra BastaraudRonan Jambou

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