CO2 mesophyll conductance regulated by light: a review

Main Conclusion Light quality and intensity regulate plant mesophyll conductance, which has played an essential role in photosynthesis by controlling leaf structural and biochemical properties. Mesophyll conductance ( g m ), a crucial physiological factor influencing the photosynthetic rate of leaves, is used to describe the resistance of CO 2 from the sub-stomatal cavity into the chloroplast up to the carboxylation site. Leaf structural and biochemical components, as well as external environmental factors such as light, temperature, and water, all impact g m . As an essential factor of plant photosynthesis, light affects plant growth and development and plays a vital role in regulating g m as well as determining photosynthesis and yield. This review aimed to summarize the mechanisms of g m response to light. Both structural and biochemical perspectives were combined to reveal the effects of light quality and intensity on the g m , providing a guide for selecting the optimal conditions for intensifying photosynthesis in plants.