| dc.description |
The carbon dioxide compensation point (Γ) was found to vary when measured at increasing light intensities, in plants grown at a constant illumination. This response varied with the physiological age of the leaf. The Γ also varied when measured at a constant illumination, with plants grown at different light intensities. The activity of the enzymes RuDP carboxylase, nitrate reductase, glycollate oxidase, and catalase was found to be influenced by the light intensity at which the plants were grown. A good correlation was obtained between the measured Γ and the ratio of nitrate reductase: RuDP carboxylase activities, suggesting that nitrate reductase may be used as an indirect measure of photorespiration in plants receiving nitrate as the sole nitrogen source. |
