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

Goecke, Franz Ronald, Labes, Antje, Wiese, Jutta and Imhoff, Johannes F. (2012) Bacteria associations with co-occurring macroalgae: Host, epiphyte and environmental factors. European Journal of Phycology, 46 (sup1). pp. 45-50. DOI 10.1080/09670262.2011.613190.

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Supplementary data:

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.

Document Type: Article
Additional Information: Oral paper
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-MI Marine Microbiology
OceanRep > GEOMAR > Applied R&D > Centre for Marine Substances (KiWiZ)
Refereed: No
Open Access Journal?: No
DOI etc.: 10.1080/09670262.2011.613190
ISSN: 0967-0262
Projects: KIWIZ
Date Deposited: 05 Dec 2012 14:23
Last Modified: 04 Jan 2017 12:50
URI: http://oceanrep.geomar.de/id/eprint/19586

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