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Related Concept Videos

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.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
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The Anatomy of Chloroplasts01:08

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Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
Structure of...
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Anatomy of Chloroplasts01:07

Anatomy of Chloroplasts

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Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.
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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
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...
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Photosystem I01:27

Photosystem I

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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...
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Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Updated: Jan 5, 2026

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
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Efficient photosynthesis in dynamic light environments: a chloroplast's perspective.

Elias Kaiser1, Viviana Correa Galvis1, Ute Armbruster1

  • 1Max Planck Institute of Molecular Plant Physiology, Wissenschaftspark Golm, Am Mühlenberg 1, 14476 Potsdam, Germany.

The Biochemical Journal
|October 27, 2019
PubMed
Summary
This summary is machine-generated.

Plants must rapidly adjust photosynthesis to changing light. This review explores chloroplast processes like non-photochemical quenching, enzyme activation, and stomatal conductance to improve crop yield.

Keywords:
fluctuating lightphotosynthesisprotein regulation

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Area of Science:

  • Plant Physiology
  • Photosynthesis Research
  • Crop Improvement

Background:

  • Natural light availability for photosynthesis fluctuates rapidly, necessitating swift plant responses.
  • Understanding these rapid responses offers insights into natural energy conversion and strategies for field applications.
  • Dynamic photosynthesis is a key target for enhancing crop yield.

Purpose of the Study:

  • To review and dissect three key processes involved in rapid photosynthetic responses: non-photochemical quenching, Calvin-Benson-Bassham cycle enzyme dynamics, and stomatal conductance.
  • To identify knowledge gaps and critically evaluate current strategies for improving dynamic photosynthesis in crops.

Main Methods:

  • Literature review focusing on functional and molecular aspects of selected chloroplast-linked processes.
  • Analysis of existing research on relaxation of non-photochemical quenching.
  • Examination of Calvin-Benson-Bassham cycle enzyme activation/deactivation kinetics.
  • Investigation of stomatal conductance dynamics in response to light changes.

Main Results:

  • Identified relaxation of non-photochemical quenching, Calvin-Benson-Bassham cycle enzyme dynamics, and stomatal conductance as critical targets for accelerating dynamic photosynthesis.
  • Highlighted gaps in understanding the molecular and functional mechanisms underlying these rapid responses.
  • Provided a critical assessment of current approaches to enhance photosynthesis in agricultural settings.

Conclusions:

  • Improving dynamic photosynthesis through targeted engineering of chloroplast processes holds significant potential for enhancing crop yield.
  • Further research is needed to fully elucidate the mechanisms governing these rapid responses and optimize engineering strategies.
  • This review provides a foundation for future research aimed at developing more efficient crops for variable light conditions.