Effect of environmental conditions on the growth of Synura petersenii (Synurophyceae) in vitro and two eutrophic water bodies in Korea

Using electron microscopy, we identified Synura petersenii as a predominant planktonic blooming algal species in two small, shallow eutrophic water bodies in Korea in summer and autumn. We further investigated the in vitro growth characteristics at different temperatures, pH values and light intensities of three strains of S. petersenii (termed JC, JD, and WM strains) isolated from three water bodies in Kyungpook Province, Korea. The three strains of S. petersenii exhibited the highest growth rates at 15°C. The maximum growth of S. petersenii occurred between pH 7.5 and 8.2 according to strain. JC and JD strains of S. petersenii exhibited the highest growth rates at a light intensity of 80 μmol m^-2 s^-1, whereas the maximum growth rate of WM strain was at 112 μmol m^-2 s^-1. The optimal light intensity of S. petersenii was affected by the temperature. The three strains of S. petersenii had different optimal growth requirements, suggesting that they exhibited strain-specific adaptation.