Modeling the ascorbate-glutathione cycle in chloroplasts under light/dark conditions

BMC Systems Biology
Edelmira ValeroFrancisco García-Carmona

Abstract

Light/dark cycles are probably the most important environmental signals that regulate plant development. Light is essential for photosynthesis, but an excess, in combination with the unavoidable presence of atmospheric oxygen inside the chloroplast, leads to excessive reactive oxygen species production. Among the defense mechanisms that activate plants to cope with environmental stress situations, it is worth noting the ascorbate-glutathione cycle, a complex metabolic pathway in which a variety of photochemical, chemical and enzymatic steps are involved. We herein studied the dynamic behavior of this pathway under light/dark conditions and for several consecutive days. For this purpose, a mathematical model was developed including a variable electron source with a rate law proportional to the intensity of solar irradiance during the photoperiod, and which is continuously turned off at night and on again the next day. The model is defined by a nonlinear system of ordinary differential equations with an on/off time-dependent input, including a parameter to simulate the fact that the photoperiod length is not constant throughout the year, and which takes into account the particular experimental kinetics of each enzyme involved in ...Continue Reading

References

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Citations

Nov 9, 2021·Frontiers in Plant Science·Nima P SaadatAnna Matuszyńska

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Methods Mentioned

BETA
MDA
environmental

Software Mentioned

COPASI

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