植物光合机构的状态转换  

State Transition of the Photosynthetic Apparatus in Plant

作　　者：刘贤德[1] 马为民[1] 沈允钢[1] 

机构地区：[1]中国科学院上海生命科学研究院植物生理生态研究所,上海200032

出　　处：《植物生理与分子生物学学报》2006年第2期127-132,共6页Journal Of Plant Physiology and Molecular Biology

基　　金：国家自然科学基金项目(No.30070064)资助。~~

摘　　要：植物光合机构的状态转换是一种通过光系统II的捕光天线色素蛋白复合体(LHCII)的可逆磷酸化调节激发能在两个光系统间的分配来适应环境中光质等短期变化的机制。一般植物光合机构的LHCII磷酸化主要受电子递体质醌和细胞色素b6f复合体氧化还原状态的调节,从而影响其在两种光系统间的移动。植物光合机构的状态转换也可以通过两种光系统相互接近导致激发能满溢来平衡两个光系统的激发能分配。外界离子浓度骤变可以引起盐藻LHCII磷酸化,其调节过程与电子递体的氧化还原状态无关。绿藻的状态转换可以调节细胞内的ATP供求关系。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 b6f 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.

关 键 词：光合机构 状态转换 LHCⅡ磷酸化 满溢 激发能 ATP 

分 类 号：Q945.11[生物学—植物学]