A comparative study of phosphorus utilization and storage in batch cultures of Peridinium cinctum, Pediastrum duplex and Cosmarium sp., from Lake Kinneret (Israel)

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Abstract
In a comparative study in batch cultures, the biomass yield of P. cinctum f. westii decreased gradually as a result of gradual phosphate depletion, whereas a significant effect on the biomass yield of Pediastrum and Cosmarium grown in identical conditions occurred only at lower P0 (0.6 and 0.2 .mu.M). In conditions of high phosphate availability, all 3 spp. accumulated P in an intracellular storage pool. Pi in the hot water extract fraction was a poor measure of the intracellular P storage. The 6% cold trichloracetic acid (TCA) insoluble P fraction contained the major storage pool of P in these algae. The level of this pool was very sensitive to changes in ambient Pi. The biomass yield of Peridinium was more sensitive to a decrease in levels in intracellular acid insoluble P than were those of Pediastrum and Cosmarium. Apparently, the alkaline phosphatase activity in the 3 spp. was controlled by the intracellular acid insoluble P pool.