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A novel actinomycete Streptomyces enissocaesilis exhibiting algicidal activity against the toxic cyanobacterium Phormidium angustissimum

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Abstract

Harmful cyanobacterial blooms that occur in freshwater can produce hazardous cyanotoxins as contaminants that threaten ecosystems, aquatic organisms, and human health. In the present study, the actinobacterium Streptomyces enissocaesilis, strain M35, isolated from soils, exhibited the strongest algicidal activity against the toxic cyanobacterium Phormidium angustissimum TISTR 8247. To improve the P. angustissimum removal efficiency of strain M35, the optimum carbon and nitrogen sources were determined as starch and yeast extract, respectively. Response surface methodology (RSM) using the Box–Behnken design (BBD) revealed that the optimal independent parameters among the culture medium conditions for enhancing the algicidal activity of strain M35 were 21.5 g/L starch, 0.57 g/L yeast extract, and a pH value of 8.00. The Phormidium sp. removal efficiency increased notably from 80.8 to 94.4% under the optimum conditions. In a batch experiment, the removal of P. angustissimum in an internal airlift loop (IAL) bioreactor containing immobilized strain M35 on a plastic medium indicated a high anti-Phormidium activity of 94.8%, whereas in a continuous system, strain M35 exhibited a removal efficiency of 85.5%. This study revealed that this actinobacterium could potentially be utilized to remove the toxic cyanobacterium Phormidium from water.

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The data supporting the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This research was supported by the Fundamental Fund of Khon Kaen University, Thailand.

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Weeraput Butsat: Conceptualization, methodology, formal analysis and investigation, and writing-original draft preparation. Thidarat Somdee: proof reading, review, and editing. Theerasak Somdee: Conceptualization, methodology, proof reading, review, and editing.

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Correspondence to Theerasak Somdee.

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Butsat, W., Somdee, T. & Somdee, T. A novel actinomycete Streptomyces enissocaesilis exhibiting algicidal activity against the toxic cyanobacterium Phormidium angustissimum. Environ Sci Pollut Res 30, 66897–66911 (2023). https://doi.org/10.1007/s11356-023-27179-8

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  • DOI: https://doi.org/10.1007/s11356-023-27179-8

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