线粒体通过改变组织O2水平来影响光合作用
Matleena Punkkinen1, Bikash Baral1, Olga Blokhina1
1Organismal and Evolutionary Biology (OEB), Viikki Plant Science Centre (ViPS), Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki 00014, Finland.
Plant physiology
|December 12, 2025
概括
线粒体通过改变氧气水平,在氧气不足的情况下影响植物质体. 增强的线粒体呼吸,特别是替代氧化酶,减少了叶绿体的压力,并改善了植物适应缺氧的情况.
科学领域:
- 植物生理学 植物生理学
- 线粒体生物学 线粒体生物学
- 叶绿体的功能 叶绿体的功能
背景情况:
- 氧气 (O2) 的可用性对于植物发育和应激反应至关重要,通过光合作用和呼吸来动态调节.
- 线粒体是主要的O2消费者,但它们在低氧条件下对质体的影响尚未完全理解.
- 线粒体逆行信号影响核基因表达,影响呼吸和潜在的叶绿体功能.
研究的目的:
- 为了研究线粒体功能,氧气水平和阿拉比多opsis thaliana中的质体反应之间的相互作用.
- 阐明线粒体压力影响光合作用和活性氧物种 (ROS) 代谢的机制.
- 了解植物适应低氧和线粒体应激的情况.
主要方法:
- 在各种阿拉比多普西斯突变种和转基因系中分析呼吸,光合作用和体内O2水平.
- 干扰包括线粒体呼吸复合体,ATP合成酶,蛋白质处理,转录和器官结构的缺陷.
- 包括线路与改变的线粒体信号,替代氧化酶 (AOX) 活动,和氧化代谢.
主要成果:
- 替代氧化酶的丰度和容量增加与在黑暗中更高的O2消耗和在光明中更慢的O2再积累有关.
- 增强的线粒体呼吸减少了甲基维奥基因对叶绿体的负面影响,表明耐受性得到改善.
- 线粒体活动的变化影响了塑性电子转移和ROS代谢,支持器官间通信.
结论:
- 在压力下增强的线粒体O2消耗降低了组织O2水平,调节了塑性电子转移和ROS代谢.
- 替代性呼吸系统成分在调解这些器官间相互作用方面发挥着关键作用.
- 这项研究提供了关于植物低氧感应,适应线粒体压力的洞察力,以及叶绿体在这些过程中的作用.
相关概念视频
Oxygenic Photosynthesis
680
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
680
Mitochondria
19.5K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
19.5K
Mitochondrial Membranes
16.5K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
16.5K
Photosystem II
78.2K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
78.2K
Anoxygenic Photosynthesis
1.1K
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
1.1K
Peroxisomes and Mitochondria
94.0K
Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within...
The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within...
94.0K


