Combined Effect of Light and Temperature on the Production of Saxitoxins in Cylindrospermopsis raciborskii Strains

is a potentially toxic freshwater cyanobacterium that can tolerate a wide range of light and temperature. Due to climatic changes, the interaction between light and temperature is studied in aquatic systems, but no study has addressed the effect of both variables on the saxitoxins production. This s...

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Bibliographic Details
Published in:Toxins 2019-01, Vol.11 (1), p.38
Main Authors: Mesquita, Marcella C B, Lürling, Miquel, Dorr, Fabiane, Pinto, Ernani, Marinho, Marcelo M
Format: Article
Language:English
Subjects:
Aquatic environment
Biosynthesis
Cellular manufacture
Climate change
cyanobacteria
cyanotoxins
Cylindrospermopsis - growth & development
Cylindrospermopsis - metabolism
Cylindrospermopsis - radiation effects
Cylindrospermopsis raciborskii
Growth rate
High temperature
Hypotheses
intraspecific variability
Light
Light effects
Low temperature
Luminous intensity
Photons
Saxitoxin - metabolism
saxitoxins
Temperature
Tropical environment
Tropical environments
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Summary:is a potentially toxic freshwater cyanobacterium that can tolerate a wide range of light and temperature. Due to climatic changes, the interaction between light and temperature is studied in aquatic systems, but no study has addressed the effect of both variables on the saxitoxins production. This study evaluated the combined effect of light and temperature on saxitoxins production and cellular quota in . Experiments were performed with three strains in batch cultures under six light intensities (10, 40, 60, 100, 150, and 500 μmol of photons m s ) and four temperatures (15, 20, 25, and 30 °C). The growth of strains was limited at lower temperatures and the maximum growth rates were obtained under higher light combined with temperatures equal or above 20 °C, depending on the strain. In general, growth was highest at 30 °C at the lower light intensities and equally high at 25 °C and 30 °C under higher light. Highest saxitoxins concentration and cell-quota occurred at 25 °C under high light intensities, but were much lower at 30 °C. Hence, increased temperatures combined with sufficient light will lead to higher biomass, but blooms could become less toxic in tropical regions.
ISSN:2072-6651
2072-6651
DOI:10.3390/toxins11010038