Abstract
We developed protocols to analyse the cell cycle of Heterosigma akashiwo in the natural phytoplankton assemblage using tyramide signal amplification-fluorescence in situ hybridisation (TSA-FISH) and flow cytometry. We determined the optimum probe and formamide concentrations for the species-specific TSA-FISH probe to be 0.5 ng µL−1 and 40%, respectively. The probe did not hybridise to non-target phytoplankton including Chattonella sp., which is closely related to Heterosigma and has high sequence similarity to it. We could successfully identify G1- and G2-phase cells and the diel cell cycle of H. akashiwo not only in the laboratory but also in the field after TSA-FISH. These results demonstrate that TSA-FISH for H. akashiwo in natural coastal waters could serve as a powerful tool for understanding their bloom mechanism using flow cytometry.
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