Molecular Plant Biology, Department of Biochemistry and Food Chemistry, University of Turku, FIN-20014 Turku, Finland.
Trends Plant Sci. 2011 Mar;16(3):126-31. doi: 10.1016/j.tplants.2010.11.006. Epub 2010 Dec 21.
Plants need a highly responsive regulatory system to keep photosynthetic light reactions in balance with the needs and restrictions of the downstream metabolism. This mechanism optimises plant growth under naturally fluctuating light conditions. In this opinion article, we present a model addressing the biological role of the light intensity-controlled phosphorylation of light-harvesting complex II (LHCII) proteins and its relation with the non-photochemical quenching of excitation energy (NPQ). We overturn a long held view of the possible role of 'state transitions'. Instead, we discuss the interplay between LHCII protein phosphorylation and NPQ, a mechanism that is crucial for regulating excitation energy distribution to the two photosystems (PSII and PSI) and balancing the intersystem electron flow despite constant fluctuations in light intensity.
植物需要一个高度响应的调节系统，以使光合作用的光反应与下游代谢的需求和限制保持平衡。这种机制可以优化植物在自然波动的光照条件下的生长。在这篇观点文章中，我们提出了一个模型，探讨了光强控制的光捕获复合物 II（LHCII）蛋白磷酸化及其与激发能非光化学猝灭（NPQ）的关系的生物学作用。我们推翻了关于“状态转变”可能作用的长期观点。相反，我们讨论了 LHCII 蛋白磷酸化和 NPQ 之间的相互作用，这种机制对于调节两个光系统（PSII 和 PSI）的激发能分布以及平衡系统间电子流至关重要，尽管光照强度不断波动。
