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2012

Marine fungi: a rich source for natural products

Silber, J., Ohlendorf, B., Erhard, A., Labes, A., & Imhoff, J. F. (2012). Marine fungi: a rich source for natural products. In SUBMARINER Blue Biotechnology Cooperation Event: New Strategies and Future Perspectives. Abgerufen von http://oceanrep.geomar.de/20272/
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2012

Conference Paper

Johanna Silber

Birgit Ohlendorf

Arlette Erhard

Antje Labes

Johannes Imhoff
Bacteria associations with co-occurring macroalgae: Host, epiphyte and environmental factors

Goecke, F. R., Labes, A., Wiese, J., & Imhoff, J. F. (2012). Bacteria associations with co-occurring macroalgae: Host, epiphyte and environmental factors. European Journal of Phycology, 46, 45–50. Abgerufen von http://oceanrep.geomar.de/19586/

Abstract

Bacteria associated with 2 macroalgae growing in the Kiel Fjord (Baltic Sea) were investigated seasonally over two years by scanning electron microscopy and cultivation methods. Seasonal variations and significant differences between both macroalgal species with respect to the associated bacteria were observed. 166 bacterial strains were isolated from the macroalgae and classified by phylogenetic analysis of 16S rRNA gene sequences. The strains formed 82 phylotypes according to sequence similarities of499.0\%. Samples from Fucus vesiculosus revealed 43 and from Delesseria sanguinea 57 bacterial phylotypes. They affiliated to Actinobacteria, Alphaproteobacteria, Bacilli, Betaproteobacteria, Flavobacteria, Gammaproteobacteria, and Sphingobacteria. Following the assumption that chemical interactions rule the bacteria-macroalga associations, we tested the biological activity of both macroalgae and isolated bacterial strains against a panel comprising standard and ecologically relevant microorganisms (Gram-positive and Gram-negative bacteria, including macroalgal pathogens and surface associated strains, and a yeast). Both macroalgae presented inhibitory activity against at least one microorganism, but overall the inhibitory activities were low. In contrast, all extracts stimulated growth of many of the tested bacteria. While growth stimulation was common concerning bacteria associated with macroalgae, no stimulation was shown for the standard set of bacteria (with exception of one case of stimulation of the plant pathogen Erwinia amylovora). Regarding the potential biological activity of microorganisms associated with macroalgae, more than 60\% of the bacterial phylotypes inhibited the growth of at least one microorganism. A higher proportion of strains showed antimicrobial activity against the set of bacteria associated with macroalgae as compared to standard set of microorganisms. Certain phylotypes are consistently found as epiphytes, suggesting their specific association with macroalgae. The presented positive and negative effects of macroalgal extracts on growth of macroalga-associated bacteria, significant bacterial activity against macroalgal pathogens and competitors, and potential degradative capabilities support the assumption that complex chemical interactions shape the bacteria-macroalga relationships.
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2012

Journal Article

Franz Goecke

Antje Labes

Jutta Wiese

Johannes Imhoff
Observation of bacteria over the surface of released oogonia from Fucus vesiculosus L (Phaeophyceae)

Goecke, F. R., Labes, A., Wiese, J., Schmaljohann, R., & Imhoff, J. F. (2012). Observation of bacteria over the surface of released oogonia from Fucus vesiculosus L (Phaeophyceae). Gayana Botanica, 69, 376–379. Abgerufen von http://oceanrep.geomar.de/19591/
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2012

Journal Article

Franz Goecke

Antje Labes

Jutta Wiese

Rolf Schmaljohann

Johannes Imhoff
Phylogenetic relationships among bacteria described from algae: Algae are a distinct source of new taxa

Goecke, F. R., Wiese, J., Labes, A., & Imhoff, J. F. (2012). Phylogenetic relationships among bacteria described from algae: Algae are a distinct source of new taxa. In 3. Latin-American Congress of Algal Biotechnology. Abgerufen von http://oceanrep.geomar.de/19547/
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2012

Conference Paper

Franz Goecke

Jutta Wiese

Antje Labes

Johannes Imhoff
Bioactive products of marine microorganisms ? from biological interactions to application in an Europoean framework

Imhoff, J. F., & Labes, A. (2012). Bioactive products of marine microorganisms ? from biological interactions to application in an Europoean framework. In Meeting of the Scientific Advisory Board - GEOMAR. Abgerufen von http://oceanrep.geomar.de/19552/
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2012

Conference Paper

Johannes Imhoff

Antje Labes
Phylogenetic relationships among bacteria described from algae: Distinct source of new taxa

Goecke, F. R., Thiel, V., Wiese, J., Labes, A., & Imhoff, J. F. (2012). Phylogenetic relationships among bacteria described from algae: Distinct source of new taxa. In Jahrestagung der Vereinigung für Allgemeine und Angewandte Mikrobiologie. Abgerufen von http://oceanrep.geomar.de/19548/
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2012

Conference Paper

Franz Goecke

Vera Thiel

Jutta Wiese

Antje Labes

Johannes Imhoff

2011

From marine ecology to marine biotechnology ? Small bioactive molecules in biological interactions and biotechnological applications

Labes, A., Nagel, K., Schneemann, I., Wiese, J., & Imhoff, J. F. (2011). From marine ecology to marine biotechnology ? Small bioactive molecules in biological interactions and biotechnological applications. In Clusterretreat Future Ocean. Abgerufen von http://oceanrep.geomar.de/12916/
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2011

Conference Paper

Antje Labes

Kerstin Nagel

Imke Schneemann

Jutta Wiese

Johannes Imhoff

Microbiology

biotechnology
Insights supporting the proposal of possible ?symbiotic role? of marine bacteria on macroalgae

Goecke, F. R., Labes, A., Wiese, J., & Imhoff, J. F. (2011). Insights supporting the proposal of possible ?symbiotic role? of marine bacteria on macroalgae. In MIMAS Symposium. Abgerufen von http://oceanrep.geomar.de/12926/
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2011

Conference Paper

Franz Goecke

Antje Labes

Jutta Wiese

Johannes Imhoff

Microbiology
Secondary metabolites of fungi associated to the marine sponge Halichondria panacea

Kramer, A., Labes, A., Wiese, J., Ohlendorf, B., & Imhoff, J. F. (2011). Secondary metabolites of fungi associated to the marine sponge Halichondria panacea. In MIMAS Symposium. Abgerufen von http://oceanrep.geomar.de/12918/
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2011

Conference Paper

Annemarie Kramer

Antje Labes

Jutta Wiese

Birgit Ohlendorf

Johannes Imhoff

Microbiology

marine sponge Halichondria panacea
Bacteria associated with coexisting macroalgae: seasonal, interspecies variation and antibiotic effects

Goecke, F. R., Labes, A., Wiese, J., & Imhoff, J. F. (2011). Bacteria associated with coexisting macroalgae: seasonal, interspecies variation and antibiotic effects. In VAAM-Jahrestagung 2011. Abgerufen von http://oceanrep.geomar.de/12920/
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2011

Conference Paper

Franz Goecke

Antje Labes

Jutta Wiese

Johannes Imhoff

Microbiology

Medical Science

BACTERIA

antibiotic effects

Macroalgae

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2012

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