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Related Concept Videos

Light as Energy01:35

Light as Energy

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
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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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Photosynthesis is a multipart, biochemical process that occurs in plants as well as in some bacteria. It captures carbon dioxide and solar energy to produce glucose. Glucose stores chemical energy in the form of carbohydrates. The overall biochemical formula of photosynthesis is 6 CO2 + 6 H2O + Light energy → C6H12O6 + 6 O2. Photosynthesis releases oxygen into the atmosphere and is largely responsible for maintaining the Earth’s atmospheric oxygen content.
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What is Photosynthesis?01:00

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All living organisms on Earth are directly or indirectly dependent on photosynthesis. It is the only biological process that can capture energy from sunlight and convert it into chemical energy that every organism can use to power its metabolism. Photosynthesis is also the source of oxygen required by many living organisms.
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OverviewOxygenic photosynthesis plays a central role in the global carbon and oxygen cycles. The carbohydrates produced support nearly all food webs, while the oxygen by‑product enables aerobic life.Light‑dependent and light‑independent reactionsPhotosynthesis occurs in two main stages, each in a different part of the chloroplast: light‑dependent reactions and light‑independent reactions, also called the Calvin‑Benson cycle or simply the Calvin...
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Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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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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Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
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Photosynthesis without β-carotene.

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Summary
This summary is machine-generated.

Researchers discovered the first plant capable of photoautotrophic growth without carotenes. This tobacco plant, containing only astaxanthin, demonstrates functional photosystems and regulated electron transport, challenging previous assumptions about carotenoid necessity in photosynthesis.

Keywords:
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Area of Science:

  • Plant Biology
  • Photosynthesis Research
  • Biochemistry

Background:

  • Carotenoids, including carotenes and xanthophylls, are vital for oxygenic photosynthesis, stabilizing pigment-protein complexes, harvesting light, and photoprotection.
  • Previous research indicated carotenes are essential for photosynthesis, as no plants lacking them in photosystems could grow photoautotrophically.

Purpose of the Study:

  • To investigate photoautotrophic growth in plants lacking carotenes.
  • To characterize the function of photosystems in plants with only xanthophylls.

Main Methods:

  • Generation of a tobacco mutant lacking carotenes, possessing only the xanthophyll astaxanthin.
  • Assessment of photosystem functionality, non-photochemical quenching, and photosystem ratio regulation in the mutant.

Main Results:

  • The astaxanthin-containing tobacco plant exhibited photoautotrophic growth, demonstrating fully functional photosystems despite the absence of carotenes.
  • Photosystems were functional with astaxanthin occupying carotenoid-binding sites, and non-photochemical quenching occurred without zeaxanthin and lutein.
  • The plant demonstrated a wide dynamic range in regulating the ratio of the two photosystems for optimized electron transport.

Conclusions:

  • Carotenes are not essential for photoautotrophic growth or photosystem function in plants.
  • Xanthophylls, specifically astaxanthin in this case, can substitute for carotenes in maintaining photosystem integrity and function.
  • Plants possess sophisticated mechanisms to regulate photosystem ratios for efficient photosynthesis under varying conditions.