Abstract
The CO 2 kinetics of photosynthesis were investigated in air and water for a number of emergent and submerged plants. The investigation included terrestrial plants that occasionally become submerged as a result of flooding of their habitat, as well as homophyllous and heterophyllous amphibious plants. Ambient photosynthesis, initial slope of the CO 2-photosynthesis curve and CO 2 compensation point of these plants were compared with literature values for truly aquatic and terrestrial plants. Compensation points of emergent and submerged amphibious plants measured in air resembled those of terrestrial C 3 plants, whereas compensation points measured in water varied greatly, depending in part on the ability of the plants to use HCO − 3 for photosynthesis and thus reduce CO 2 compensation points. Ambient photosynthetic rates and initial slopes of the CO 2-photosynthesis curves of amphibious plants were similar to those of aquatic plants and were lower than values for terrestrial plants. Photosynthetic performance of aquatic, amphibious and terrestrial plants showed no parallel variation with chlorophyll content.
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