Stimulation and inhibition effects of algae-lytic products from Bacillus cereus strain L7 on Anabaena flos-aquae

Zhao, Sen; Pan, Wei; Ma, Chunyan

doi:10.1007/s10811-011-9725-9

Cited by 18 publications

(12 citation statements)

References 38 publications

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“…These inconsistent results could originate from a concentration effect. Zhao and colleagues () studied the effects the algicidal substances excreted by Bacillus cereus L7 on A. flos‐aquae growth. The authors indicated that a high concentration of algae‐lytic products (0.5 mg l −1 ) inhibited the cyanobacterial growth whereas exposure to a 10‐fold lower concentration increased growth, chlorophyll a, protein and phycobiliprotein contents.…”

Section: Biotic Factors Promoting the Decline Of Cyanobacterial Bloomsmentioning

confidence: 99%

Microbial players involved in the decline of filamentous and colonial cyanobacterial blooms with a focus on fungal parasitism

Gerphagnon

Macarthur

Latour

et al. 2015

Environmental Microbiology

109

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SummaryIn the forthcoming decades, it is widely believed that the dominance of colonial and filamentous bloomforming cyanobacteria (e.g. Microcystis, Planktothrix, Anabaena and Cylindrospermopsis) will increase in freshwater systems as a combined result of anthropogenic nutrient input into freshwater bodies and climate change. While the physicochemical parameters controlling bloom dynamics are well known, the role of biotic factors remains comparatively poorly studied. Morphology and toxicity oftenbut not always -limit the availability of cyanobacteria to filter feeding zooplankton (e.g. cladocerans). Filamentous and colonial cyanobacteria are widely regarded as trophic dead-ends mostly inedible for zooplankton, but substantial evidence shows that some grazers (e.g. copepods) can bypass this size constraint by breaking down filaments, making the bloom biomass available to other zooplankton species. A wide range of algicidal bacteria (mostly from the Alcaligenes, Flavobacterium/Cytophaga group and Pseudomonas) and viruses (Podoviridae, Siphoviridae and Myoviridae) may also contribute to bloom control, via their lytic activity underpinned by a diverse array of mechanisms. Fungal parasitism by the Chytridiomycota remains the least studied. While each of these biotic factors has traditionally been studied in isolation, emerging research consistently point to complex interwoven interactions between biotic and environmental factors.

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Section: Biotic Factors Promoting the Decline Of Cyanobacterial Bloomsmentioning

confidence: 99%

Microbial players involved in the decline of filamentous and colonial cyanobacterial blooms with a focus on fungal parasitism

Gerphagnon

Macarthur

Latour

et al. 2015

Environmental Microbiology

109

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“…1 B). It has been reported that extracts from Hydrilla verticillate can suppress the growth of D. flos-aquae 27 , as can compounds from the Bacillus cereus strain 28 . Moreover, Kaminski et al 29 suggested that Lemna trisulca could naturally eliminate D. flos-aquae .…”

Section: Resultsmentioning

confidence: 99%

The effects of aqueous extract from watermelon (Citrullus lanatus) peel on the growth and physiological characteristics of Dolichospermum flos-aquae

Yan

Zhang

et al. 2022

Sci Rep

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Nowadays, the increasing Dolichospermum (Anabaena) blooms pose a major threat to the aquatic environment and public health worldwide. The use of naturally derived chemicals from plants to control cyanobacteria blooms has recently received a tremendous amount of attention. This study investigates the possibility of transforming watermelon peel (WMP) into a biological resource to allelopathically inhibit Dolichospermum flos-aquae blooms. The results demonstrated that the growth of D. flos-aquae was efficiently restricted by the aqueous extract of watermelon peel (WMPAE) in a concentration-dependent manner. Cell viability decreased quickly, intracellular structural damage occurred, chlorophyll a in algal cells degraded, and photosynthesis was clearly inhibited. At the same time, the levels of reactive oxygen species in viable cells increased significantly, as did malondialdehyde levels, indicating that WMPAE elucidated strong oxidative stress and corresponding damage to D. flos-aquae. Capsular polysaccharide (CPS) levels increased in all treatment groups, which represents an adaptive response indicative of the development of resistance to WMPAE stress and oxidative damage. Despite this, WMPAE had clear inhibitory effects on D. flos-aquae. These findings provide fundamental information on an allelopathic system that could be a novel and attractive approach for suppressing D. flos-aquae blooms in small aquatic environments, especially aquaculture ponds.

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“…This screening revealed eight additional papers. Thus, a total of 39 papers are included in this review, most of which include multifactorial experiments, such as different contaminants, strains, or additional experimental treatments other than contaminants. − …”

Section: Literature Review Methodologymentioning

confidence: 99%

“…Hormetic responses of HAB-forming and toxin-producing cyanobacteria are induced by many chemicals, such as arsenate, , environmental estrogens, chlorinated organophosphorus flame retardants (Cl-OPFRs), halogenated organic compounds, heavy metals, hydrogen peroxide (algaecide), and the principal compound of yellow dye luteolin and other allelopathic chemicals/algaecides. ,− They were also induced by various antibiotics, ,,− ,,− nanomaterials, polycyclic aromatic hydrocarbons, rare earths, , and several pesticides and disinfectants. ,,,− Hence, hormetic responses represent a universal phenomenon across chemically diverse contaminants. The studies providing such evidence commonly apply environmentally relevant concentrations, demonstrating that realistic concentrations widely enhance harmful algae and the production of microcystins.…”

Section: Occurrence Of Hormesis In Harmful Algaementioning

confidence: 99%

Low Levels of Contaminants Stimulate Harmful Algal Organisms and Enrich Their Toxins

Agathokleous

Peñuelas

Azevedo

et al. 2022

Environ. Sci. Technol.

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A widespread increase in intense phytoplankton blooms has been noted in lakes worldwide since the 1980s, with the summertime peak intensity amplifying in most lakes. Such blooms cause annual economic losses of multibillion USD and present a major challenge, affecting 11 out of the 17 United Nations Sustainable Development Goals. Here, we evaluate recent scientific evidence for hormetic effects of emerging contaminants and regulated pollutants on Microcystis sp., the most notorious cyanobacteria forming harmful algal blooms and releasing phycotoxins in eutrophic freshwater systems. This new evidence leads to the conclusion that pollution is linked to algal bloom intensification. Concentrations of contaminants that are considerably smaller than the threshold for toxicity enhance the formation of harmful colonies, increase the production of phycotoxins and their release into the environment, and lower the efficacy of algaecides to control algal blooms. The low-dose enhancement of microcystins is attributed to the up-regulation of a protein controlling microcystin release (McyH) and various microcystin synthetases in tandem with the global nitrogen regulator Ycf28, nonribosomal peptide synthetases, and several ATP-binding cassette transport proteins. Given that colony formation and phycotoxin production and release are enhanced by contaminant concentrations smaller than the toxicological threshold and are widely occurring in the environment, the effect of contaminants on harmful algal blooms is more prevalent than previously thought. Climate change and nutrient enrichment, known mechanisms underpinning algal blooms, are thus joined by low-level pollutants as another causal mechanism.

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Stimulation and inhibition effects of algae-lytic products from Bacillus cereus strain L7 on Anabaena flos-aquae

Cited by 18 publications

References 38 publications

Microbial players involved in the decline of filamentous and colonial cyanobacterial blooms with a focus on fungal parasitism

Microbial players involved in the decline of filamentous and colonial cyanobacterial blooms with a focus on fungal parasitism

The effects of aqueous extract from watermelon (Citrullus lanatus) peel on the growth and physiological characteristics of Dolichospermum flos-aquae

Low Levels of Contaminants Stimulate Harmful Algal Organisms and Enrich Their Toxins

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