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Development of Rapid PCR Methods for the Detection and Quantification of Geosmin-Producing Dolichospermum spp.

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Abstract

Geosmin, produced by cyanobacteria and actinomycetes, is a common cause of earthy odor in lakes, rivers, and reservoirs. Drinking water quality standards in Japan requires that geosmin concentration be maintained at < 10 ng/L. The concentration of musty/earthy odor compounds in water bodies tends to exhibit a positive correlation with the cell density of cyanobacteria producing these compounds. In general, it is difficult to accurately distinguish and quantify musty/earthy odor-producing cyanobacteria through microscopic observation. Thus, it is essential to develop simple and rapid monitoring methods to assess the abundance of musty/earthy odor-producers and predict the onset of musty odor events to ensure good water quality. In this study, we developed PCR and qPCR-based assays using whole cells to effectively monitor geosmin-producing cyanobacteria using a gene encoding geosmin synthase (geoA). Geosmin-producing cyanobacteria Dolichospermum smithii NIES-824 and Dolichospermum macrosporum were used as representative strains for the study. The brightness of the specific electrophoresis band related to geoA gene amplified using whole-cell PCR was found to be positively correlated (R2 > 0.9) to the cell density of Dolichospermum spp. In addition, the whole-cell qPCR analysis presented a high correlation (R2 > 0.8) as well, between the copy number of geoA gene and cyanobacterial biomass. These results affirm the potential of using whole-cell PCR and qPCR-based detection methods for the rapid prediction and monitoring of geosmin producers in aquatic environments.

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All data generated or analyzed during this study are included in this published article and its supplementary information files.

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Funding

This research was supported by a Health Labor Sciences Research Grant (H30-Kenki-Ippan-004 and 21LA1004) from the Ministry of Health, Labor and Welfare, Japan.

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Hanchen Miao: the data curation; formal analysis; conceptualization; writing, original draft; methodology; investigation; and validation. Qingyue Shen: the writing, original draft; data curation; and validation. Ji Zhang: the investigation and methodology. Satoshi Ichise: the resources and writing—review and editing. Yasuhiro Asada: the resource and writing—review and editing. Yuan Tian: the writing—review and editing. Motoo Utsumi: the writing, review and editing; resources; and supervision. Zhongfang Lei: the writing, review and editing; and supervision. Zhenya Zhang: the writing, review and editing; and supervision. Hirokazu Takanashi: the writing, review and editing; and conceptualization. Naoshi Fujimoto: the resource and writing—review and editing. Osamu Nishimura: the methodology and writing—review and editing. Michihiro Akiba: the conceptualization, funding acquisition, project administration, and writing—review and editing. Kazuya Shimizu: the conceptualization; writing, original draft; writing, review and editing; supervision; and project administration. All of the authors read and approved the final manuscript.

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Correspondence to Kazuya Shimizu.

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Miao, H., Zhang, J., Shen, Q. et al. Development of Rapid PCR Methods for the Detection and Quantification of Geosmin-Producing Dolichospermum spp.. Water Air Soil Pollut 233, 394 (2022). https://doi.org/10.1007/s11270-022-05859-4

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  • DOI: https://doi.org/10.1007/s11270-022-05859-4

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