Photosystem Ii
Photosystem Ii - Related Videos
01:27
Photosystem I
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2019
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor. Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
01:22
Photosystem II
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2019
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 molecules...
01:32
Photosystems
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2023
Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast. Functioning of Photosystems Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
07:12
High-Throughput, In-Field Screening of Photosynthetic Efficiency in Crop Plants Using an Autonomous Robot
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2026
This manuscript describes a non-destructive, high-throughput approach for autonomous field measurements of photosystem II quantum efficiency, spectral reflectance, and plant architecture, enabling large-scale canopy photosynthesis phenotyping in agronomic and breeding field trials.
06:00
Wet Beveling of Microinjection Needles Utilizing Constant Air Pressure for Feedback on Needle Opening
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2024
This protocol describes the assembly of a pneumatic system for the delivery of pressurized air to a needle during the process of needle beveling. The protocol further describes the beveling process for creating sharp microinjection needles and how to gauge the relative opening size of the needle.
FAQs
P680 serves as the reaction-center chlorophyll that responds when photons are absorbed. Its excitation raises electron energy, allowing Photosystem II to pass high-energy electrons into an electron transport chain. This initial energy conversion links incoming light to downstream chemical energy storage in oxygenic photosynthesis efficiently.
Water splitting does more than supply replacement electrons. It provides the electrons needed after P680 has transferred high-energy electrons, releases protons that contribute to the proton gradient, and produces molecular oxygen. Consequently, this reaction couples charge replacement, energy-related proton movement, and oxygen generation within the light-dependent stage.
Electron transport does not simply move electrons away from the reaction center. It carries high-energy electrons through a chain and contributes to the proton gradient used for ATP production. The electrons then supply downstream reactions leading to NADPH formation, connecting Photosystem II activity with broader photosynthetic energy conversion.
Photosystem II occurs in thylakoid membranes of plants, algae, and cyanobacteria. This location places the complex within the membrane system where light-dependent reactions occur. Its presence across these organisms provides a basis for studying oxygenic photosynthesis across biological groups and relating the process to photosynthetic adaptation.
Studying Photosystem II helps connect molecular events with larger biological outcomes. Researchers can use its activity as a framework for understanding how plants produce biomass, how oxygen is generated, and how photosynthetic organisms adapt to their light environments. These links make the complex relevant to fundamental biology and plant productivity.
Its light-driven electron transfer and water-splitting chemistry make Photosystem II relevant to bioinspired solar-energy research. Scientists study these features as a biological reference for converting light into useful chemical energy. The significance is conceptual: the complex shows how oxygen generation and energy conversion can be integrated in one photosynthetic system.