Abstract
The effects of hypoosmotic shock on state transition in darkness in Dunaliella salina were studied. When the concentration of NaCl in culture medium was dropped from 1.5 to 0.5 mol/L abruptly, the photosynthetic rate of D. salina declined, but the respiratory rate and in- tracellular ATP content increased in the dark. The FPSⅡ/FPSⅠ ratio at 77 K of D. salina cells exposed to hypoosmotic shock was higher than that of control cells, indicating that more excitation energy was distributed to PSⅡ in stressed D. salina cells upon illumination. A decrease in LHCⅡ pho- sphorylation level was also observed when D. salina was exposed to hypoosmotic shock. Thus a stateⅠtransition of photosynthetic apparatus occurs when D. salina suffers hypoosmotic shock in darkness, which is supposed to be related to an enhancement of respiration and an increase in ATP content in stressed D. salina cells.
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