PJB-2019-251
GROWTH AND SOME METABOLITES OF THREE CYANOBACTERIA UNDER VARIOUS PHOSPHORUS CONCENTRATIONS
Ahmed A. Issa
Abstract
The growth pattern in the medium containing various phosphorus concentrations was shown around 14 days. Anabaena sp., Merismopedia tenuissima and Spirulina platensis growth curves were enhanced by P deficiency in comparison to control. A decrease in phosphorus concentrations by 50 % led to an increase in Chl. a of M. tenuissima and S. platensis. The application of high concentration of phosphorus (+100 %) to the culture of Anabaena sp. led to an increase in dry weight and growth rate by 0.382 mgml-1 and 0.013 h-1, respectively. Generally, the net and true photosynthetic oxygen evolution of three tested cyanobacteria were increased by decreasing phosphorus concentrations in the culture media to 50% and 25% that of the control. The deficiency of phosphorus concentrations led to a decrease in carbohydrate contents of Anabaena, Merismopedia and Spirulina with compared to the control culture. In general, the total lipid contents of Anabaena sp. and M. tenuissima were stimulated by phosphorus deficiency. The phosphorus-free media and increase in phosphorus concentration by 100% resulted in an increase in protein fractions such as soluble, insoluble, globulins, prolamines, glutelins and total protein content of Anabaena sp. The application of high concentration of phosphorus (+100 %) to the culture of S. platensis led to an increase in total lipid contents in comparison to control. The highest phycobiliprotein contents of S. platensis were recorded at 50% phosphorus deficiency.
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