| Hypoosmotic shock induces a stateⅠtransition of photosynthetic apparatus in Dunaliella salina |
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| 引用本文： | LIUXiande SHENYungang. Hypoosmotic shock induces a stateⅠtransition of photosynthetic apparatus in Dunaliella salina[J]. 科学通报(英文版), 2004, 49(7): 672-675. DOI: 10.1007/BF03184263 |
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| 作者姓名： | LIUXiande SHENYungang |
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| 作者单位： | InstituteofPlantPhysiologyandEcology,ShanghaiInstitutetotBiologicalSciences,ChineseAcademyofSciences,Shanghai20（X）32,China |
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| 摘 要： | The effects of hypoosmotic shock on state transition in darkness in Dunaliella salina were studied. When the concentration of NaCI 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 intracellular 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 PS Ⅱ in stressed D.salina cells upon illumination. A decrease in LHC Ⅱ phosphorylation level was also observed when D.salina was exposed to hypoosmotic shock. Thus a state Ⅰ transition 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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| 关 键 词： | 光合作用器官 低渗休克 状态转换 盐生杜氏藻 光合速率 呼吸速率 |
| 收稿时间： | 2004-01-08 |
Hypoosmotic shock induces a state I transition of photosynthetic apparatus inDunaliella salina |
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| Liu,Xiande,Shen,Yungang. Hypoosmotic shock induces a state I transition of photosynthetic apparatus inDunaliella salina[J]. Chinese science bulletin, 2004, 49(7): 672-675. DOI: 10.1007/BF03184263 |
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| Authors: | Liu Xiande Shen Yungang |
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| Affiliation: | LIU Xiande & SHEN Yungang Institute of Plant Physiology and Ecology,Shanghai Institute for Biological Sciences,Chinese Academy of Sciences,Shanghai 200032,China |
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| 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 intracellular 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 phosphorylation level was also observed when D. salina was exposed to hypoosmotic shock. Thus a state Ⅰ transition 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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| Keywords: | Dunaliella salina photosynthetic apparatus hypoosmotic shock state transition. |
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