Growth and Toxin production by Cylindrospermopsis raciborskii under different light intensities, Phosphate and Nitrates concentrations

Abstract

The cyanobacteria species cylindrospermopsis raciborskii, that is known for its bloom forming and toxin production (cylindrospermopsin) got a lot of attention by scientist due to its harmful risk to living organism. In this study effects of light intensities, limited nitrogen and phosphorus concentration on the growth, toxin production, heterocyst production and filaments length were examined. The result confirmed that C. racciborskii can grow in low light intensity as compared to high light. The optical density result of low and without addition of nitrogen and phosphorus was significantly lower than the higher concentration. The length of the filaments was higher with increase in nitrates and phosphates concentration. The number of the heterocysts was only found when the dissolve nitrogen was in minimum concentration (33mgN/L). While there was no toxin (cylindrospermopsin) found in any sample in all treatments under high and low light intensities. In conclusion C. raciborskii can rapidly shows a growth response in high nutrients values.