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

Goecke, Franz Ronald; Labes, Antje; Wiese, Jutta; Imhoff, Johannes F.

doi:10.4067/s0718-19572012000100007

Cited by 19 publications

(10 citation statements)

References 42 publications

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“…Halomonas -algae associations are potentially beneficial for the alga, since the bacteria may provide vitamins ( Croft et al, 2005 ), release siderophores ( Keshtacher-Liebson et al, 1995 ; Baggesen et al, 2014 ), or excrete morphogenetic compounds ( Spoerner et al, 2012 ; Tapia et al, 2016 ) that are essential for algal growth. Symbiotic associations with algae may be linked to the capacity of Halomonas to degrade algal excreted polysaccharides and/or the presence of alginate lyases ( Wong et al, 2000 ; Tang et al, 2008 ; Wang et al, 2008 ; Goecke et al, 2012 ) and indeed, bacterial cells can be closely attached to algal cell walls ( Croft et al, 2005 ; Tapia et al, 2016 ). In this study, Halomonas was the most abundant isolate obtained with direct plating techniques without pretreatment (DP1 and DP2).…”

Section: Discussionmentioning

confidence: 99%

Exploring the Cultivable Ectocarpus Microbiome

et al. 2017

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Coastal areas form the major habitat of brown macroalgae, photosynthetic multicellular eukaryotes that have great ecological value and industrial potential. Macroalgal growth, development, and physiology are influenced by the microbial community they accommodate. Studying the algal microbiome should thus increase our fundamental understanding of algal biology and may help to improve culturing efforts. Currently, a freshwater strain of the brown macroalga Ectocarpus subulatus is being developed as a model organism for brown macroalgal physiology and algal microbiome studies. It can grow in high and low salinities depending on which microbes it hosts. However, the molecular mechanisms involved in this process are still unclear. Cultivation of Ectocarpus-associated bacteria is the first step toward the development of a model system for in vitro functional studies of brown macroalgal–bacterial interactions during abiotic stress. The main aim of the present study is thus to provide an extensive collection of cultivable E. subulatus-associated bacteria. To meet the variety of metabolic demands of Ectocarpus-associated bacteria, several isolation techniques were applied, i.e., direct plating and dilution-to-extinction cultivation techniques, each with chemically defined and undefined bacterial growth media. Algal tissue and algal growth media were directly used as inoculum, or they were pretreated with antibiotics, by filtration, or by digestion of algal cell walls. In total, 388 isolates were identified falling into 33 genera (46 distinct strains), of which Halomonas (Gammaproteobacteria), Bosea (Alphaproteobacteria), and Limnobacter (Betaproteobacteria) were the most abundant. Comparisons with 16S rRNA gene metabarcoding data showed that culturability in this study was remarkably high (∼50%), although several cultivable strains were not detected or only present in extremely low abundance in the libraries. These undetected bacteria could be considered as part of the rare biosphere and they may form the basis for the temporal changes in the Ectocarpus microbiome.

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Section: Discussionmentioning

confidence: 99%

Exploring the Cultivable Ectocarpus Microbiome

et al. 2017

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“…Given this important ecological role of epibiotic biofilms, it is crucial to know how composition (and function) of these biofilms on F. vesiculosu s is controlled by the host and the environment. The former has recently been described to some extent, showing that F. vesiculosus produces antibiotic and probiotic metabolites (Saha et al ., , ; Goecke et al ., ; Lachnit et al ., ). In contrast, the effect of abiotic factors, which are highly variable in coastal ecosystems and are shifting in the course of climate change (BACC Author Team, ; Neumann & Friedland, ), on these epiphytic communities is understudied.…”

Section: Introductionmentioning

confidence: 98%

Salinity affects compositional traits of epibacterial communities on the brown macroalgaFucus vesiculosus

Stratil

Neulinger

Knecht

et al. 2014

FEMS Microbiol Ecol

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Epibiotic biofilms have the potential to control major aspects of the biology and ecology of their hosts. Their composition and function may thus be essential for the health of the host. We tested the influence of salinity on the composition of epibacterial communities associated with the brown macroalga Fucus vesiculosus. Algal individuals were incubated at three salinities (5, 19, and 25) for 14 days and nonliving reference substrata (stones) were included in the experiment. Subsequently, the composition of their surface-associated bacterial communities was analyzed by 454 pyrosequencing of 16S rRNA gene sequences. Redundancy analysis revealed that the composition of epiphytic and epilithic communities significantly differed and were both affected by salinity. We found that 5% of 2494 epiphytic operational taxonomic units at 97% sequence similarity were responsible for the observed shifts. Epibacterial α-diversity was significantly lower at salinity 5 but did not differ between substrata. Our results indicate that salinity is an important factor in structuring alga-associated epibacterial communities with respect to composition and/or diversity. Whether direct or indirect mechanisms (via altered biotic interactions) may have been responsible for the observed shifts is discussed.

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“…While the extracts of the subtropical marine algae Caulerpa sertularioides, Dictyota pulchella, and D. ciliolate deterred all urchins, the other macroalgae extracts from the cold-adapted areas led to different feeding resistance patterns. Apart from anti-herbivore activity, many macroalgae are known for their antimicrobial and antifouling activity (Goecke et al 2010(Goecke et al , 2012Pérez et al 2016;Schwartz et al 2017). A review by Harder et al (2012) highlights the crucial role of halogenated furanones (Fig.…”

Section: Marine Chemical Ecology: Predator-prey Interactions and Compmentioning

confidence: 99%

Secondary Metabolites of Marine Microbes: From Natural Products Chemistry to Chemical Ecology

Petersen

Kellermann

Schupp

2019

YOUMARES 9 - The Oceans: Our Research, Our Future

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Marine natural products (MNPs) exhibit a wide range of pharmaceutically relevant bioactivities, including antibiotic, antiviral, anticancer, or anti-inflammatory properties. Besides marine macroorganisms such as sponges, algae, or corals, specifically marine bacteria and fungi have shown to produce novel secondary metabolites (SMs) with unique and diverse chemical structures that may hold the key for the development of novel drugs or drug leads. Apart from highlighting their potential benefit to humankind, this review is focusing on the manifold functions of SMs in the marine ecosystem. For example, potent MNPs have the ability to exile predators and competing organisms, act as attractants for mating purposes, or serve as dye for the expulsion or attraction of other organisms. A large compilation of literature on the role of MNPs in marine ecology is available, and several reviews evaluated the function of MNPs for the aforementioned topics. Therefore, we focused the second part of this review on the importance of bioactive compounds from crustose coralline algae (CCA) and their role during coral settlement, a topic that has received less attention. It has been shown that certain SMs derived from CCA and their associated bacteria are able to induce attachment and/or metamorphosis of many benthic invertebrate larvae, including globally threatened reef-building scleractinian corals. This review provides an overview on bioactivities of MNPs from marine microbes and their potential use in medicine as well as on the latest findings of the chemical ecology and settlement process of scleractinian corals and other invertebrate larvae.

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

Cited by 19 publications

References 42 publications

Exploring the Cultivable Ectocarpus Microbiome

Exploring the Cultivable Ectocarpus Microbiome

Salinity affects compositional traits of epibacterial communities on the brown macroalgaFucus vesiculosus

Secondary Metabolites of Marine Microbes: From Natural Products Chemistry to Chemical Ecology

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