缺乏会改变Marchantia多态体中的光合作用电子传输
Umama Hani1, Anja Krieger-Liszkay1
1Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, 91198, Gif-sur-Yvette cedex, France.
Plant physiology and biochemistry : PPB
|August 22, 2024
概括
缺乏会减缓P700的氧化,并减少肝中的塑素,影响光系统I的功能. 这表明甲状腺蛋白重组增强了在营养应激下循环电子运输.
科学领域:
- 植物生理学 植物生理学
- 光合作用研究研究 光合作用研究
- 分子植物生物学 分子植物生物学
背景情况:
- (Mn) 对于植物生长至关重要,特别是光系统II的水氧化复合体.
- 缺乏对光系统I (PSI) 的影响仍然不太清楚.
- 马尔坎蒂亚多态生物 (Marchantia polymorpha) 是研究植物基本过程的模型生物.
研究的目的:
- 调查Mn缺乏对Marchantia polymorpha中的P700和塑素 (Pc) 的氧化还原变化的体内影响.
- 阐明Mn饥饿对光系统I活动和电子传输的影响.
- 在Mn-缺乏条件下探索甲状腺膜的潜在结构适应.
主要方法:
- 使用KLAS-NIR光谱光度计用于P700和Pc氧化还原状态的体内测量.
- 采用远红色照明来选择性地激发光系统I并促进循环电子传输.
- 使用西部斑点分析确认了塑素含量变化.
主要成果:
- 缺乏导致P700的氧化速度减慢,与P700相比减少了Pc信号.
- 西部斑点证实了Mn缺乏肝脏的Pc含量较低.
- 与对照组相比,在Mn缺乏的鱼中观察到P700+和Pc+的更快的再减少动力学.
结论:
- 缺乏会影响电子转移率,从 stromal 捐赠体到 Pc+ 和 P700+.
- 更快的再减少动力学表明在Mn饥饿下改变了电子流动力学.
- 提议对甲状腺膜进行结构重组,有利于形成超复杂物,以增强Mn缺乏的植物中的循环电子运输.
相关概念视频
02:35Key Elements for Plant Nutrition
18.7K
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
18.7K
01:40Overview of Metabolism
29.7K
Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
29.7K
01:46The Calvin Benson Cycle
4.5K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
4.5K
01:42The Antenna Complex
6.0K
Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency...
6.0K
01:34The Z-Scheme of Electron Transport in Photosynthesis
10.0K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.0K
01:30The Electron Transport Chain
16.3K
The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
16.3K