Activity of the natural algicide, cyanobacterin, on eukaryotic microorganisms

This review covers the literature on the chemically mediated ecology of cyanobacteria, including ultraviolet radiation protection, feeding-deterrence, allelopathy, resource competition, and signalling. To highlight the chemical and biological diversity of this group of organisms, evolutionary and chemotaxonomical studies are presented. Several technologically relevant aspects of cyanobacterial chemical ecology are also discussed.

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“…83, 85 Several cyanobacteria, eukaryotic algae and angiosperms have been reported to be susceptible to this allelochemical. 83-86 …”

Section: Ecological Roles Played By Cyanobacterial Metabolitesmentioning

confidence: 99%

The chemical ecology of cyanobacteria

et al. 2012

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“…To the best of our knowledge, there are no reports of using green microalgae as sources of growth-inhibiting substances for weed control. Only a few studies have been conducted to assess specifically cyanobacterial toxins as herbicides [ 48 , 69 , 70 ]. We demonstrated that methanolic extracts of strain 124 effectively control the germination and growth of a glyphosate-resistant A. palmeri , suggesting the presence of molecules with herbicidal activity.…”

Section: Discussionmentioning

confidence: 99%

Bioactive Compounds with Pesticide Activities Derived from Aged Cultures of Green Microalgae

Brito-Bello,

Lopez-Arredondo

2023

Biology

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The excessive use of synthetic pesticides has caused environmental problems and human health risks and increased the development of resistance in several organisms. Allelochemicals, secondary metabolites produced as part of the defense mechanisms in plants and microorganisms, are an attractive alternative to replace synthetic pesticides to remediate these problems. Microalgae are natural producers of a wide range of allelochemicals. Thus, they provide new opportunities to identify secondary metabolites with pesticide activities and an alternative approach to discover new modes of action and circumvent resistance. We screened 10 green microalgae strains belonging to the Chlorophyta phylum for their potential to inhibit the growth of photosynthetic and nonphotosynthetic organisms. Bioassays were established to assess microalgae extracts’ effectiveness in controlling the growth of Chlorella sorokiniana, Arabidopsis thaliana, Amaranthus palmeri, and the model nematode Caenorhabditis elegans. All tested strains exhibited herbicidal, nematocidal, or algicidal activities. Importantly, methanol extracts of a Chlamydomonas strain effectively controlled the germination and growth of a glyphosate-resistant A. palmeri biotype. Likewise, some microalgae extracts effectively killed C. elegans L1 larvae. Comprehensive metabolic profiling using LC-MS of extracts with pesticide activities showed that the metabolite composition of Chlamydomonas, Chlorella, and Chloroidium extracts is diverse. Molecules such as fatty acids, isoquinoline alkaloids, aldehydes, and cinnamic acids were more abundant, suggesting their participation in the pesticide activities.

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“…The allelopathic activity between cyanobacteria that occur in the same ecosystem is an interesting concept in terms of evolution. The literature data indicated that some Cyanophyceae could produce the allelopathic compounds that affect the growth of other cyanobacterial species (e.g., [45][46][47][48][49][50][51][52][53]). What is more, recent research showed that picoplanktonic cyanobacteria are also capable of allelopathic effects on other cyanobacteria.…”

Section: Discussionmentioning

confidence: 99%

The Importance of Allelopathic Picocyanobacterium Synechococcus sp. on the Abundance, Biomass Formation, and Structure of Phytoplankton Assemblages in Three Freshwater Lakes

Bubak

Śliwińska‐Wilczewska

Głowacka

et al. 2020

Toxins

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The contribution of picocyanobacteria to summer phytoplankton blooms, accompanied by an ecological crisis, is a new phenomenon in Europe. This issue requires careful investigation. We studied allelopathic activity of freshwater picocyanobacterium Synechococcus sp. on phytoplankton assemblages from three freshwater lakes. In this study, the allelopathic activity of the Synechococcus sp. on the total abundance, biomass, as well as structure of the phytoplankton assemblages were investigated. Our results indicated that addition of exudates obtained from Synechococcus sp. affected the number of cells and biomass of the phytoplankton communities; the degree of inhibition or stimulation was different for each species, causing a change in the phytoplankton abundance and dominance during the experiment. We observed that some group of organisms (especially cyanobacteria from the genus Aphanothece, Limnothrix, Microcystis, and Synechococcus) showed tolerance for allelopathic compounds produced and released by Synechococcus sp. It is also worth noting that in some samples, Bacillariophyceae (e.g., Amphora pediculus, Navicula pygmaea, and Nitzschia paleacea) were completely eliminated in the experimental treatments, while present in the controls. This work demonstrated that the allelopathic activity exhibited by the Synechococcus sp. is probably one of the major competitive strategies affecting some of the coexisting phytoplankton species in freshwater ecosystems. To our best knowledge this is the first report of the allelopathic activity of Synechococcus sp. in the freshwater reservoirs, and one of the few published works showing allelopathic properties of freshwater picocyanobacteria on coexisting phytoplankton species.

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Activity of the natural algicide, cyanobacterin, on eukaryotic microorganisms

Cited by 51 publications

References 8 publications

The chemical ecology of cyanobacteria

The chemical ecology of cyanobacteria

Bioactive Compounds with Pesticide Activities Derived from Aged Cultures of Green Microalgae

The Importance of Allelopathic Picocyanobacterium Synechococcus sp. on the Abundance, Biomass Formation, and Structure of Phytoplankton Assemblages in Three Freshwater Lakes

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