Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea

It is assumed that the biological characteristics of the bacterial strains used in bioactivity tests have strong influences on their susceptibility against antibacterial compounds. Therefore, the selection of bacterial test strains may rush conclusions on the effect of macroalgal extracts and metabo...

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Autores principales:	Goecke,Franz, Labes,Antje, Wiese,Jutta, Imhoff,Johannes F
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2012
Materias:	Marine algae antibacterial activities stimulation of bacterial growth Kiel fjord
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000100007
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spelling	oai:scielo:S0718-195720120001000072012-06-21Dual effect of macroalgal extracts on growth of bacteria in Western Baltic SeaGoecke,FranzLabes,AntjeWiese,JuttaImhoff,Johannes F Marine algae antibacterial activities stimulation of bacterial growth Kiel fjord It is assumed that the biological characteristics of the bacterial strains used in bioactivity tests have strong influences on their susceptibility against antibacterial compounds. Therefore, the selection of bacterial test strains may rush conclusions on the effect of macroalgal extracts and metabolites on bacteria. To proof this assumption, we have analysed the biological activities of crude extracts of 16 macroalgae from the coastal waters of Kiel Fjord (Germany), and tested their effect against a panel of 10 microorganisms comprising 5 standard test strains of bacteria and 5 macroalga-associated bacteria. Fourteen macroalgae (88%) displayed antibacterial activity against at least one of the test strains. Despite the high proportion of extracts exhibiting antimicrobial activity, only 3 strains of the standard set were susceptible to macroalgal extracts and the overall activities were low (less than 80% of inhibition). Most of active extracts inhibited Bacillus subtilis, while no inhibition effects were found against Erwinia amylovora, Escherichia coli, and the macroalga-associated bacteria. In contrast, all extracts produced stimulatory growth effects of at least two of the tested bacteria. While growth stimulation of standard set of bacteria was rare (22.5% of total tests) with exception of plant pathogen Erwinia amylovora and two cases of Staphylococcus lentus, it was common among bacteria associated with macroalgae (77.5%), especially Bacillus algicola, Pseudomonas marincola and both algal-pathogenic bacteria. This study demonstrates that macroalgal extracts can display different effects, i.e., inhibition or stimulation of bacterial growth depending on the origin of the test strains, which are derived from a standard panel or from the marine environment, respectively.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.47 n.1 20122012-04-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000100007en10.4067/S0718-19572012000100007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Marine algae antibacterial activities stimulation of bacterial growth Kiel fjord
spellingShingle	Marine algae antibacterial activities stimulation of bacterial growth Kiel fjord Goecke,Franz Labes,Antje Wiese,Jutta Imhoff,Johannes F Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea
description	It is assumed that the biological characteristics of the bacterial strains used in bioactivity tests have strong influences on their susceptibility against antibacterial compounds. Therefore, the selection of bacterial test strains may rush conclusions on the effect of macroalgal extracts and metabolites on bacteria. To proof this assumption, we have analysed the biological activities of crude extracts of 16 macroalgae from the coastal waters of Kiel Fjord (Germany), and tested their effect against a panel of 10 microorganisms comprising 5 standard test strains of bacteria and 5 macroalga-associated bacteria. Fourteen macroalgae (88%) displayed antibacterial activity against at least one of the test strains. Despite the high proportion of extracts exhibiting antimicrobial activity, only 3 strains of the standard set were susceptible to macroalgal extracts and the overall activities were low (less than 80% of inhibition). Most of active extracts inhibited Bacillus subtilis, while no inhibition effects were found against Erwinia amylovora, Escherichia coli, and the macroalga-associated bacteria. In contrast, all extracts produced stimulatory growth effects of at least two of the tested bacteria. While growth stimulation of standard set of bacteria was rare (22.5% of total tests) with exception of plant pathogen Erwinia amylovora and two cases of Staphylococcus lentus, it was common among bacteria associated with macroalgae (77.5%), especially Bacillus algicola, Pseudomonas marincola and both algal-pathogenic bacteria. This study demonstrates that macroalgal extracts can display different effects, i.e., inhibition or stimulation of bacterial growth depending on the origin of the test strains, which are derived from a standard panel or from the marine environment, respectively.
author	Goecke,Franz Labes,Antje Wiese,Jutta Imhoff,Johannes F
author_facet	Goecke,Franz Labes,Antje Wiese,Jutta Imhoff,Johannes F
author_sort	Goecke,Franz
title	Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea
title_short	Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea
title_full	Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea
title_fullStr	Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea
title_full_unstemmed	Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea
title_sort	dual effect of macroalgal extracts on growth of bacteria in western baltic sea
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000100007
work_keys_str_mv	AT goeckefranz dualeffectofmacroalgalextractsongrowthofbacteriainwesternbalticsea AT labesantje dualeffectofmacroalgalextractsongrowthofbacteriainwesternbalticsea AT wiesejutta dualeffectofmacroalgalextractsongrowthofbacteriainwesternbalticsea AT imhoffjohannesf dualeffectofmacroalgalextractsongrowthofbacteriainwesternbalticsea
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Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea

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