The effect of nitrogen and phosphorus on the accumulation of extracellular marennine-like pigment in the culture of Haslea karadagensis (Bacillariophyta)
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Abstract
Currently, five species of diatoms from the genus Haslea are known to produce marennine pigments, which slightly differ in their physicochemical characteristics. The available data on these pigments primarily relates to H. ostrearia, but given the noted biodiversity, it is important to study these pigments in other members of the genus, specifically H. karadagensis, endemic to the Black Sea. The purpose of this study is to investigate the influence of nitrogen and phosphorus on the accumulation of marennine-like pigments in H. karadagensis cultures. Literature data on the effects of these essential biogenic elements on pigment accumulation in these organisms are conflicting. The growth rates and dynamics of extracellular marennine accumulation in H. karadagensis cultures were determined. For the studied clones, the absence of a significant correlation between the specific productivity in relation to the release of extracellular marennine and the levels of nitrogen and phosphorus in the medium was established.