Abstract
Prorocentrum donghaiense is a dinoflagellate with a high frequency of bloom formation in the East China Sea. These blooms harm coastal ecosystems, marine fisheries, aquatic environments, and public health. Therefore, new and rapid methods that accurately process and specifically detect this alga are crucial to facilitate long-term monitoring or to provide timely warnings of P. donghaiense blooms. We report the development of a quantitative real-time PCR (qPCR) method to identify and detect P. donghaiense. The partial large subunit (LSU) rDNA D1–D2 was cloned and sequenced to design specific amplification primers. The specificity of the primers was tested using regular PCR and fluorescent PCR against a wide range of microalgae widely distributed along the Chinese coast. The qPCR detection protocol was based on two standard curves. Both curves were constructed from standard samples of tenfold serially diluted solutions of the recombinant plasmid containing the LSU D1–D2 fragment and crude DNA extracts with a known number of target cells. A quantitative relationship between the cell numbers and their corresponding plasmid copy numbers was established; this relationship can be used to determine the target cell number of unknown samples in combination with a standard curve that was generated from tenfold-diluted plasmid solutions and the determined C t value of target DNA. The effectiveness of the developed protocol was tested with a series of simulated and field samples. The developed qPCR had a detection sensitivity of up to 3.45 cells. The performance of qPCR was not affected by nontarget DNA. The detection test with a series of samples fixed for 40 days showed that qPCR is competent for long-term monitoring programs that require the quantitative analysis of fixative-preserved samples. qPCR can identify the target cells in the field samples within 3–4 h. No significant differences in the quantitative results of the target cells were observed between qPCR and light microscopy. Overall, the established qPCR method is specific, sensitive, rapid, accurate, and promising for the field detection of P. donghaiense in natural samples.
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This work was supported by the National Scientific Foundation of China (41476086, 41106082, 41176141); the S & T Project of Shenzhen Science and Technology Innovation Committee (JSKF201505293000320); the Open Fund of Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences (KLMEES201303); and the Basic Research of Harbin Institute of Technology Outstanding Talents Cultivation Plan of Class III.
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Zhang, C.Y., Chen, G.F., Zhou, J. et al. Development of a quantitative PCR for detection and quantification of Prorocentrum donghaiense . J Appl Phycol 28, 1683–1693 (2016). https://doi.org/10.1007/s10811-015-0682-6
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DOI: https://doi.org/10.1007/s10811-015-0682-6