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The PSⅠ-H subunit of photosystem Ⅰ is essential for state transitions in plant photosynthesis

机译：光系统Ⅰ的PSⅠ-H亚基对于植物光合作用的状态转变是必不可少的

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Photosynthesis in plants involves two photosystems responsible for converting light energy into redox processes. The photosystems, PSⅠ and PSⅡ, operate largely in series, and therefore their excitation must be balanced in order to optimize photosynthetic performance. When plants are exposed to illumination favouring either PSⅡ or PSⅠ they can redistribute excitation towards the light-limited photosystem. Long-term changes in illumination lead to changes in photosystem stoichiometry. In contrast, state transition is a dynamic mechanism that enables plants to respond rapidly to changes in illumination. When PSⅡ is favoured (state 2), the redox conditions in the thylakoids change and result in activation of a protein kinase. The kinase phosphorylates the main light-harvesting complex (LHCⅡ) and the mobile antenna complex is detached from PSⅡ. It has not been clear if attachment of LHCⅡ to PSⅠ in state 2 is important in state transitions. Here we show that in the absence of a specific PSI subunit, PSⅠ-H, LHCⅡ cannot transfer energy to PSⅠ, and state transitions are impaired.
机译：植物的光合作用涉及两个将光能转化为氧化还原过程的光系统。 PSⅠ和PSⅡ这些光系统主要是串联运行的，因此必须平衡它们的激发才能优化光合性能。当植物暴露于有利于PSⅡ或PSⅠ的光照下时，它们可以向光受限的光系统重新分配激发。照明的长期变化导致光系统化学计量的变化。相反，状态转换是使植物能够快速响应光照变化的动态机制。当赞成PSⅡ（状态2）时，类囊体中的氧化还原条件发生改变，并导致蛋白激酶的活化。激酶使主要的光捕获复合物（LHCⅡ）磷酸化，移动天线复合物与PSⅡ分离。尚不清楚状态2中LHCⅡ与PSⅠ的连接在状态转变中是否重要。在此我们表明，在没有特定的PSI亚基的情况下，PSⅠ-H，LHCⅡ不能将能量转移到PSⅠ上，并且状态转换受到损害。

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