Liu Xian-De, Ma Wei-Min, Shen Yun-Gang
Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China.
Zhi Wu Sheng Li Yu Fen Zi Sheng Wu Xue Xue Bao. 2006 Apr;32(2):127-32.
State transition of the photosynthetic apparatus in plants is a short-term adaptation mediated mainly by the reversible phosphorylation of the main light-harvesting complex protein (LHCII) and its migration between photosystem I (PSI) and photosystem II (PSII). In higher plants and Chlamydomonas, LHCII phosphorylation is mainly controlled by the redox state of plastoquinone pool and cytochrome b(6)f complex, while salt could induce a redox-independent LHCII phosphorylation via transient changes in ion concentrations in Dunaliella. State transition can balance the distribution of excitation energy between PSII and PSI by changes in light absorption cross section and excitation energy spillover between the two photosystems. The preliminary results got in the studies of green algae reveal that state transition can also balance the ATP supply and demand.
植物光合机构的状态转换是一种短期适应机制，主要由主要捕光复合体蛋白（LHCII）的可逆磷酸化及其在光系统I（PSI）和光系统II（PSII）之间的迁移介导。在高等植物和衣藻中，LHCII磷酸化主要受质体醌库和细胞色素b6f复合体的氧化还原状态控制，而盐胁迫可通过杜氏盐藻中离子浓度的瞬时变化诱导不依赖氧化还原的LHCII磷酸化。状态转换可通过改变光吸收截面以及两个光系统之间的激发能溢出，平衡PSII和PSI之间的激发能分布。对绿藻的研究初步结果表明，状态转换还可以平衡ATP的供需。
