Dai Xin, Hu Ju Wei, Zhang Xiu Li, Sun Guang Yu
College of Life Science, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao. 2016 May;27(5):1674-1682. doi: 10.13287/j.1001-9332.201605.008.
Under natural conditions, light plants receive usually changes. Thus, the plants have formed corresponding adaptation mechanism in the evolutionary process, which could maintain the energy balance between two light reactions in the process of light changing. Through the movement of leaves and chloroplasts, as well as the accumulation of light-absorbing pigments, plants could regulate light absorption. Also, plants have a mechanism for greatly regulating the distribution of energy absorbed by light-harvesting complex. Especially at low light intensities, plants could mediate reversible phosphorylation of light-harvesting complex2 (LHC2) by regulating kinase and phosphatase in relation to the redox state of the electron transfer chain, which could thereby regulate the allocation of excitation energy between photosystem I (PSI) and photosystem 2(PS2). The state transitions are the quite significant mechanism of plants for adapting to the change of light environment. In this paper, the research progresses of state transitions during the change of light environment were summarized, especially the significance and functions of reversible phosphorylation and movement of LHC2 between PS I and PS2 were discussed. Finally, the future research direction on state transitions of plants was briefly proposed.
在自然条件下，轻度光照的植物通常会发生变化。因此，植物在进化过程中形成了相应的适应机制，在光照变化过程中能够维持两个光反应之间的能量平衡。通过叶片和叶绿体的运动以及光吸收色素的积累，植物可以调节光吸收。此外，植物有一种机制可以极大地调节捕光复合物吸收的能量分布。特别是在低光照强度下，植物可以通过调节与电子传递链氧化还原状态相关的激酶和磷酸酶来介导捕光复合物2（LHC2）的可逆磷酸化，从而调节光系统I（PSI）和光系统2（PS2）之间激发能的分配。状态转换是植物适应光环境变化的非常重要的机制。本文总结了光环境变化过程中状态转换的研究进展，特别讨论了LHC2在PSI和PS2之间可逆磷酸化和移动的意义及功能。最后，简要提出了植物状态转换的未来研究方向。
