Abstract
We shall demonstrate that chlorophyll (Ch1) a fluorescence senses NaCl-induced volume changes of Synechococcus sp. PCC7942 cells and responds to them quantitatively (1, 2). The cells import Na+ and Cl- passively (2–4) and export Na in exchange for protons against ∆pH via Na+/H+ antiporters located in plasma membranes (PM). The antiporters utilize the pH difference (outside acidic) that respiratory electron transport and a P-type ATPase generate across PM (4–6). NaCl concentration upshocks induce osmotic space changes (3) which are reported by changes in CM a fluorescence (1, 2). Osmotic volume changes may also occur during light/dark-acclimative transitions of cyanobacteria.
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