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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.
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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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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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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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Modeling the ascorbate-glutathione cycle in chloroplasts under light/dark conditions.

Edelmira Valero1, Hermenegilda Macià2, Ildefonso M De la Fuente3,4

  • 1Department of Physical Chemistry, School of Industrial Engineering, University of Castilla-La Mancha, Campus Universitario, s/n, Albacete, E-02071, Spain. Edelmira.Valero@uclm.es.

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Plants use the ascorbate-glutathione cycle to manage oxidative stress from light. This study models the cycle

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Computational Biology

Background:

  • Light/dark cycles are critical environmental signals regulating plant development.
  • Excess light can cause oxidative stress in plants due to reactive oxygen species production.
  • The ascorbate-glutathione cycle is a key metabolic pathway involved in plant defense against stress.

Purpose of the Study:

  • To investigate the dynamic behavior of the ascorbate-glutathione pathway under varying light/dark conditions.
  • To develop a mathematical model simulating diurnal fluctuations in this metabolic pathway.

Main Methods:

  • Developed a nonlinear system of ordinary differential equations to model the ascorbate-glutathione cycle.
  • Incorporated a variable electron source dependent on solar irradiance and photoperiod length.
  • Accounted for the specific kinetics of each enzyme within the pathway.

Main Results:

  • The model successfully simulates diurnal fluctuations in metabolite concentrations, fluxes, and enzymatic rates.
  • Unlike previous models, this approach provides dynamic, not just steady-state, solutions.
  • Results align with experimental observations of plant responses to light.

Conclusions:

  • Ascorbate recycling plays a crucial role in plant adaptation to environmental changes and oxidative stress.
  • The developed model offers a novel strategy for in vivo studies of plant defense mechanisms.
  • This approach can be applied to other complex metabolic pathways, benefiting the scientific community.