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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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Role of Reduced Coenzymes NADH and FADH₂01:29

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The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
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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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Photoreceptors and Plant Responses to Light02:00

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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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The Anatomy of Chloroplasts01:08

The Anatomy of Chloroplasts

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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.
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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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Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
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Dark starvation and chloroplast function : I. The decrease of enzyme activities correlated with NADP reduction and

S Postius1, G Jacobi

  • 1Lehrstuhl für Biochemie der Pflanzen der Universität Göttingen, Göttingen, Germany.

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Summary

Dark-induced stress in spinach plants revealed that NADP reduction decline is due to protein breakdown, not photosystem damage. Photosystem I stability was confirmed, with partial recovery of NADP reduction possible.

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Area of Science:

  • Plant Physiology
  • Photosynthesis Research
  • Biochemistry

Background:

  • Spinach plants undergo physiological changes when deprived of light.
  • Understanding chloroplast function under stress is crucial for plant science.

Purpose of the Study:

  • To investigate the impact of prolonged darkness on spinach chloroplasts.
  • To identify the causes of reduced NADP reduction activity.
  • To assess the stability and recovery potential of photosystems.

Main Methods:

  • Isolated chloroplasts from spinach plants subjected to dark starvation.
  • Measured photochemical activities, including Photosystem II (DPIP reduction).
  • Assessed NADP reduction activity and its recovery with specific factors (ferredoxin, ferredoxin-NADP-reductase, FRS).

Main Results:

  • Photosystem II remained stable during 6 days of darkness.
  • NADP reduction decreased after 2 days, attributed to protein autolysis.
  • Photosystem I stability was shown by partial reactivation of NADP reduction.
  • A low-molecular-weight factor (assumed FRS) was required for restoration after 4 days.

Conclusions:

  • Dark starvation primarily affects NADP reduction via protein degradation, not photosystem inactivation.
  • Photosystem I retains stability, but its full NADP reducing capacity requires specific factors.
  • In vivo NADP-reducing system activity is restored upon re-illumination.