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Algicidal properties of fermentation products from Bacillus cereus strain JZBC1 dissolving dominant dinoflagellate species Scrippsiella trochoidea, Prorocentrum micans, and Peridinium umbonatum

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Abstract

Intensive and semi-intensive aquaculture systems typically produce high loads of nutrients in their discharge, potentially leading to the development and persistence of harmful algal blooms (HABs). Algicidal bacteria, which inhibit algal growth or kill algal cells, offer a promising biocontrol strategy for reducing HAB. The strain JZBC1, which displays strong algicidal activity against the HAB species Scrippsiella trochoidea, was previously isolated from a dinoflagellate bloom area and identified as Bacillus cereus. In this study, strain JZBC1 was fermented in 2 L and 50 L systems, and then, algicidal properties of JZBC1 fermentation products on the harmful dinoflagellate species S. trochoidea, Prorocentrum micans, and Peridinium umbonatum were examined. Bacterial concentrations of strain JZBC1 reached 6.23 × 109 and 4.47 × 109 CFU/mL in 2 L and 50 L cultures, respectively, and thus effectively expanded during fermentation. Strain JZBC1 showed substantial algicidal activities and a wide algicidal range toward harmful dinoflagellates. Vegetative JZBC1 cells exhibited the best inhibitory and algicidal effects in 1 day. Strain JZBC1 can be formulated into a powder, and the spores can be activated before field application to increase their efficacy. These findings will facilitate large-scale fermentation production and application of Bacillus strain JZBC1 for controlling dinoflagellate blooms in aquaculture ponds.

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Abbreviations

HABs:

Harmful Algal Blooms

CFU:

Colony Forming Units

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Acknowledgments

We would like to thank Editage (www.editage.cn) for English language editing.

Funding

This study was funded by the National Key R&D Program of China (2019YFD0900400); program of China Agriculture Research System (CARS-48); Central Public-Interest Scientific Institution Basal Research Fund, South China Sea Fisheries Research Institute, CAFS (2019TS06); Guangdong Provincial Special Fund For Modern Agriculture Industry Technology Innovation Teams (2019KJ149); and Guangdong Special Fund for Economic Development Project (Modern Fisheries Development) (2019B12).

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Xiaojuan Hu performed the data analyses and wrote the manuscript, Haochang Su performed the analysis with discussions and helped to revise the manuscript,Yu Xu helped to perform the analysis with constructive discussions, Wujie Xu performed the experiments and analyzed the data, Shasha Li performed the experiments, Xiaoshuai Huang wrote the manuscript, Yucheng Cao and Guoliang Wen, as corresponding authors, designed the experiments and contributed to the conception of the study.

Corresponding authors

Correspondence to Yucheng Cao or Guoliang Wen.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Hu, X., Su, H., Xu, Y. et al. Algicidal properties of fermentation products from Bacillus cereus strain JZBC1 dissolving dominant dinoflagellate species Scrippsiella trochoidea, Prorocentrum micans, and Peridinium umbonatum. Biologia 75, 2015–2024 (2020). https://doi.org/10.2478/s11756-020-00500-3

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  • DOI: https://doi.org/10.2478/s11756-020-00500-3

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