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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Photosynthesis Research

Background:

  • Mesophyll conductance (g(m)) is a key factor limiting the rate of photosynthesis.
  • CO(2) diffusion from substomatal cavities to chloroplasts is influenced by internal plant processes.
  • Accurate estimation of g(m) is vital for understanding photosynthetic efficiency.

Purpose of the Study:

  • To investigate the influence of mitochondrial respiration on mesophyll conductance (g(m)) estimates.
  • To determine how respiratory CO(2) affects apparent g(m) and photosynthesis measurements.
  • To provide a method for directly estimating photorespiratory CO(2) refixation.

Main Methods:

  • Analysis of CO(2) diffusion within plant leaves.
  • Modeling the impact of mitochondrial CO(2) release on g(m) calculations.
  • Investigating the relationship between stomatal conductance and g(m).

Main Results:

  • Estimates of g(m) are significantly affected by mitochondrial respiration and photorespiration.
  • Apparent CO(2) and oxygen sensitivity of g(m) is linked to the ratio of CO(2) release to uptake.
  • The study identified biases in estimating the CO(2) photocompensation point and Rubisco kinetics.
  • An obligatory correlation between stomatal conductance and g(m) was observed.

Conclusions:

  • Mitochondrial respiration influences mesophyll conductance (g(m)) measurements, not its intrinsic properties.
  • The findings necessitate re-evaluation of photosynthesis models and measurements.
  • Direct estimation of photorespiratory CO(2) refixation is possible using g(m) measurements.