The Rate of Photorespiration during Photosynthesis and the Relationship of the Substrate of Light Respiration to the Products of Photosynthesis in Sunflower Leaves 1

摘要

Single attached leaves of sunflower (Helianthus annus L. “Mennonite”) were supplied 14CO2 of constant specific radioactivity in gas mixtures containing various CO2 and O2 concentrations. The 14CO2 and CO2 fluxes were measured concurrently in an open system using an ionization chamber and infrared gas analyzer.