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The Korean Society of Phycology (한국조류학회(藻類))
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Quantification of the ichthyotoxic raphidophyte Chattonella marina complex by applying a droplet digital PCR

  • Juhee, Min (Department of Oceanography, College of Natural Sciences, Chonnam National University) ;
  • Kwang Young, Kim (Department of Oceanography, College of Natural Sciences, Chonnam National University)
  • Received : 2022.09.26
  • Accepted : 2022.11.30
  • Published : 2022.12.15
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Abstract

Quantifying the abundance of Chattonella species is necessary to effectively manage the threats from ichthyotoxic raphidophytes, which can cause large-scale mortality of aquacultured fish in temperate waters. The identification and cell counting of Chattonella species have been conducted primarily on living cells without fixation by light microscopy because routine fixatives do not retain their morphological features. Species belonging to the Chattonella marina complex, including C. marina and C. marina var. ovata, had high genetic similarities and the lack of clear morphological delimitations between the species. To estimate the abundance of C. marina complex in marine plankton samples, we developed a protocol based on the droplet digital polymerase chain reaction (ddPCR) assay, with C. marina complex-specific primers targeting the internal transcribed spacer (ITS) region of the rDNA. Cell abundance of the C. marina complex can be determined using the ITS copy number per cell, ranging from 25 ± 1 for C. marina to 112 ± 7 for C. marina var. ovata. There were no significant differences in ITS copies estimated by the ddPCR assay between environmental DNA samples from various localities spiked with the same number of cells of culture strains. This approach can be employed to improve the monitoring efficiency of various marine protists and to support the implementation of management for harmful algal blooms, which are difficult to analyze using microscopy alone.

Keywords

Acknowledgement

We would like to thank Dr. HG Lee for providing feedback on the workflow of droplet digital PCR. This research was supported by a National Research Foundation (NRF) grant funded by the Korean government (MSIT) (NRF-2016R1A6A1A03012647, NRF-2020R1A2C3005053, NRF-2022M3I6A1085991) to KYK.

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