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The Calvin Benson Cycle01:46

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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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Variation in Rubisco content and activity under variable climatic factors.

Jeroni Galmés1, Iker Aranjuelo, Hipólito Medrano

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Abiotic stresses negatively impact Rubisco activity, affecting plant photosynthesis. Climate change is predicted to exacerbate these effects, reducing plant productivity.

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Environmental Science

Background:

  • Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is a key enzyme in photosynthesis.
  • Environmental factors significantly influence Rubisco's function and plant productivity.

Purpose of the Study:

  • To review and compile data on the effects of various climatic conditions on Rubisco.
  • To analyze Rubisco's activity, activation state, and concentration under abiotic stress.
  • To understand the impact on leaf gas exchange and photosynthesis.

Main Methods:

  • Compilation and analysis of published data on Rubisco and environmental stress.
  • Review of studies examining drought, salinity, heavy metals, temperature, ozone, CO2, and UV-B irradiance.
  • Correlation of in vitro Rubisco parameters with in vivo CO2 assimilation rates.

Main Results:

  • Abiotic stresses generally cause a significant negative effect on Rubisco activity.
  • Drought and high temperatures reduce Rubisco activity by altering its activation state.
  • Low temperature, heavy metals, ozone, and UV-B primarily affect Rubisco concentration.

Conclusions:

  • Rubisco activity is a critical determinant of CO2 assimilation under stress.
  • Climate change-induced stress is likely to decrease Rubisco activity, impacting plant productivity.
  • Future plant productivity models must account for reduced Rubisco activity due to climate change.