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外文期刊>THE PLANT CELL
>Dynamic Plastid Redox Signals Integrate Gene Expression and Metabolism to Induce Distinct Metabolic States in Photosynthetic Acclimation in Arabidopsis
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Dynamic Plastid Redox Signals Integrate Gene Expression and Metabolism to Induce Distinct Metabolic States in Photosynthetic Acclimation in Arabidopsis
n nnnPlants possess acclimation responses in which structural reconfigurationsadapt the photosynthetic apparatus to fluctuating illumination.Long-term acclimation involves changes in plastid and nucleargene expression and is controlled by redox signals from photosynthesis.The kinetics of these signals and the adjustments of energeticand metabolic demands to the changes in the photosynthetic apparatusare currently poorly understood. Using a redox signaling systemthat preferentially excites either photosystem I or II, we measuredthe time-dependent impact of redox signals on the transcriptomeand metabolome of Arabidopsis thaliana. We observed rapid anddynamic changes in nuclear transcript accumulation resultingin differential and specific expression patterns for genes associatedwith photosynthesis and metabolism. Metabolite pools also exhibiteddynamic changes and indicate readjustments between distinctmetabolic states depending on the respective illumination. Thesestates reflect reallocation of energy resources in a definedand reversible manner, indicating that structural changes inthe photosynthetic apparatus during long-term acclimation areadditionally supported at the level of metabolism. We proposethat photosynthesis can act as an environmental sensor, producingretrograde redox signals that trigger two parallel adjustmentloops that coordinate photosynthesis and metabolism to adaptplant primary productivity to the environment.展开▼
机译:ABSTRACTn FONT> TH> TR> TABLE> n
n TOP n <字体颜色= 464c53>抽象 FONT> n 介绍 n 结果 n 讨论 n 方法 n 参考文献 n FONT> TH> TR> TABLE> n nnn植物具有适应性响应,其中结构重新配置 SUP>使光合设备适应光照变化。 SUP>长期驯化涉及质体和核 SUP>基因表达的变化,并受光合作用的氧化还原信号控制。 SUP>这些信号的动力学以及能量 SUP>和代谢需求对光合作用装置 SUP>的变化的调节尚不清楚。使用优先激发光系统I或II的氧化还原信号系统 SUP>,我们测量了 SUP>氧化还原信号对转录组 SUP>和代谢组的时间依赖性影响拟南芥(Irabidopsis thaliana) I>。我们观察到 SUP>与光合作用和代谢相关的基因的差异表达和特异性表达模式,导致 SUP>的核转录本积累迅速而动态地变化。代谢物池还表现出 SUP>动态变化,并根据各自的光照指示不同的 SUP>代谢状态之间的重新调整。这些 SUP>状态以定义的 SUP>可逆方式反映了能源的重新分配,表明长期适应过程中光合作用设备中 SUP>的结构变化< SUP> SUP>在代谢水平上也得到了支持。我们建议 SUP>认为光合作用可以充当环境传感器,产生 SUP>还原氧化还原信号,触发两个平行调整的 SUP>循环,以协调光合作用和新陈代谢以适应< SUP> SUP>将主要生产力提高到环境中。 SUP>
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