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Photosystem II01:22

Photosystem II

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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.
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Photosystem I01:27

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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
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The Z-Scheme of Electron Transport in Photosynthesis01:34

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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...
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Photosystems01:32

Photosystems

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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
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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 can...
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Oxygenic Photosynthesis01:26

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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...
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Targeted Inhibition of Photosystem II Electron Transport Using Bioherbicide-Loaded Ultrasmall Nanodevices.

Montcharles S Pontes1,2, Leandro O Araujo2, Jaqueline S Santos3

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Ultrasmall superparamagnetic iron oxide nanoparticles (USPIONs) enhance the bioherbicide usnic acid (UA) efficacy by improving its delivery and controlled release. This novel nanoformulation boosts photosystem II inhibition, offering a promising strategy for targeted weed control.

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Area of Science:

  • Agricultural Science
  • Nanotechnology
  • Plant Physiology

Background:

  • Usnic acid (UA) is a potential bioherbicide targeting photosystem II (PSII) but requires enhanced delivery for agricultural use.
  • Ultrasmall superparamagnetic iron oxide nanoparticles (USPIONs) offer a novel platform for smart drug/pesticide delivery systems.

Purpose of the Study:

  • To develop and characterize a USPION-based nanoformulation for improved usnic acid delivery and controlled release.
  • To evaluate the enhanced herbicidal efficacy of UA-loaded USPIONs on photosystem II inhibition and plant physiological responses.

Main Methods:

  • Synthesis and characterization of sub-10 nm USPIONs for agricultural applications.
  • Investigation of UA release kinetics, including magnetically triggered release.
  • Assessment of PSII inhibition via chlorophyll fluorescence, gene expression analysis (psbA, petA), enzyme assays (SOD, CAT), and molecular docking simulations.

Main Results:

  • USPIONs significantly accelerated UA release under an external alternating magnetic field (AMF) (41.03 min vs. 1086 min for 50% release).
  • The nanoformulation enhanced PSII inhibition, evidenced by reduced Fv/Fm values and upregulation of photosynthetic genes.
  • Enzyme assays indicated induced oxidative stress, and molecular docking confirmed UA's binding affinity within the D1 protein's QB-binding domain.

Conclusions:

  • USPIONs effectively enhance the PSII-inhibitory action of usnic acid, improving its bioherbicidal potential.
  • The developed nanoformulation demonstrates feasibility as a targeted bioherbicide carrier.
  • Further agronomic and environmental validation is recommended for practical application.