Optimizing photosynthesis under fluctuating light
Optimizing photosynthesis under fluctuating light
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优化波动光下的光合作用
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
D. Leister
中科院分区：
文献类型：
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作者：
P. Pesaresi;Alexander P. Hertle;M. Pribil;A. Schneider;T. Kleine;D. Leister
最佳的光合性能要求等量的光被光系统II（PSII）和光系统I（PSI）吸收，它们通过光合电子传递链在功能上连接。然而，光合生物必须科普导致一个或另一个光系统优先刺激的光条件。植物对这种不平衡的反应是通过安装驯化反应，重新分配光系统之间的激发能和恢复光合氧化还原平衡。在短期内，这涉及到所谓的状态转换过程，在几分钟的时间内，通过捕光复合物II（LHCII）的移动的部分与PSI或PSII的可逆缔合来改变光系统的触角横截面。光质量的长期变化会引发长期响应（LTR），发生在数小时至数天的时间尺度上，通过改变两个光系统的相对量来纠正激发能量的不平衡。尽管它们的作用时间尺度不同，状态转换和LTR都是由质体醌（PQ）池的氧化还原状态触发的，通过类囊体激酶STN 7的激活，STN 7似乎充当两种反应的共同氧化还原传感器和/或信号转导器。这篇简短的综述强调了最近关于STN 7在协调短期和长期光合适应反应中的作用的研究结果。
Optimizal photosynthetic performance requires that equal amounts of light are absorbed by photosystem II (PSII) and photosystem I (PSI), which are functionally linked through the photosynthetic electron transport chain. However, photosynthetic organisms must cope with light conditions that lead to the preferential stimulation of one or other of the photosystems. Plants react to such imbalances by mounting acclimation responses that redistribute excitation energy between photosystems and restore the photosynthetic redox poise. In the short term, this involves the so-called state transition process, which, over periods of minutes, alters the antennal cross-sections of the photosystems through the reversible association of a mobile fraction of light-harvesting complex II (LHCII) with PSI or PSII. Longer-lasting changes in light quality initiate a long-term response (LTR), occurring on a timescale of hours to days, that redresses imbalances in excitation energy by changing the relative amounts of the two photosystems. Despite the differences in their timescales of action, state transitions and LTR are both triggered by the redox state of the plastoquinone (PQ) pool, via the activation of the thylakoid kinase STN7, which appears to act as a common redox sensor and/or signal transducer for both responses. This mini-review highlights recent findings concerning the role of STN7 in coordinating short- and long-term photosynthetic acclimation responses.