An immunological approach to detect phosphate stress in populations and single cells of photosynthetic picoplankton

Article Abstract:

The cell wall-associated phosphate-binding protein in the marine cyanobacterium Synechococcus sp. strain WH7803 was evaluated for application as a diagnostic marker for the P status of photosynthetic picoplankton. The protein was found to be induced at concentrations of P(sub i) typical of oligotrophic conditions. PstS expression can be specifically determined by standard Western blotting procedures in natural mesocosm samples under conditions in which the N/P ratio was artificially manipulated to force P depletion.

Marine plankton

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Effect of phosphorus on the Synechococcus cell cycle in surface Mediterranean waters during summer

Article Abstract:

The addition of phosphorus (P) to cultures of Synechococcus cells isolated from the Mediterranean Sea decreases the duration of the G1 phase of the cell cycle. This causes the cells to enter and leave the S and G2 phases earlier than normal. The addition of nitrogen fails to affect the cell cycle. A study indicates that the Synechococcus cells are P-limited rather than N-limited during summers. The concentration of P that affects 50% of the bacterial cells is low during June and increases by July.

Analysis, Environmental aspects, Mediterranean Sea, Natural history, Bacterial growth, Cell cycle, Phosphorus, Phosphorus (Chemical element)

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Autotrophic and mixotrophic hydrogen photoproduction in sulfur-deprived Chlamydomonas cells

Article Abstract:

Hydrogen photoproduction can be induced in conditions of sulfur deprivation in the presence of acetate, in Chlalamydomonas reinhardtii cells. The decrease in the photosystem II (PSII) activity induced by sulfur deprivation leads to anoxia, respiration becoming higher than photosynthesis thereby allowing hydrogen production.

Science & research, Physiological aspects, Hypoxia, Anoxia, Chlamydomonas

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