【摘 要】
：
The effects of hypoosmotic shock on statetransition in darkness in Dunaliella salina were studied.When the concentration of NaCl in culture medium wasdropped fr
【机 构】
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Institute of Plant Physiology and Ecology
【基金项目】
：
国家重点基础研究发展计划(973计划);国家自然科学基金
论文部分内容阅读
The effects of hypoosmotic shock on statetransition in darkness in Dunaliella salina were studied.When the concentration of NaCl in culture medium wasdropped from 1.5 to 0.5 mol/L abruptly, the photosyntheticrate of D. salina declined, but the respiratory rate and in-tracellular ATP content increased in the dark. The FPSⅡ/FPSⅠratio at 77 K of D. salina cells exposed to hypoosmotic shockwas higher than that of control cells, indicating that moreexcitation energy was distributed to PSⅡ in stressedD. 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 ofphotosynthetic apparatus occurs when D. salina suffershypoosmotic shock in darkness, which is supposed to berelated to an enhancement of respiration and an increase inATP content in stressed D. salina cells.
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