Photorespiration and CO₂ compensation point in <i>Najas flexilis</i>1

Abstract

The response of net photosynthesis, light:dark respiration ratio, and CO 2 compensation point to oxygen manipulation and to inhibitors of glycolate metabolism confirms earlier evidence that photorespiration occurs in Najas flexilis and can influence its productivity. Estimates of the CO 2 compensation point are similar to those for several other submersed angiosperms which cannot reduce total aqueous CO 2 concentration much below air equilibrium levels.