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Relations between CO₂ Exchange Rate, CO₂ Compensation, and Mesophyll Resistance from a Simple Field Method¹

An equation is developed that relates apparent photosynthesis to CO₂ light compensation values, resistance to CO₂ light compensation values, resistance to CO₂ diffusion in air, and the apparent mesophyll resistance to CO₂ transport. the equation also yields values for total photosynthesis and light respiration from measurements of apparaent photosynthesis. A simple method for measuring leaf CO₂ exchange rates in the field with a hand-operated syringe is described. Results obtained with this device and data published in recent literature are used with the new equation to show that photosynthesis be limited more by mesophyll resistance than by photorespiration.

Key Words: Stomatal resistance • Photo-respiration • Gross photosynthesis • Chloroplast CO₂ concentrations

² Soil scientist, Snake River Conservation Research Center, Kimberly, ID 83341

Received for publication June 12, 1976.