Postillumination Respiration of Maize in Relation to Oxygen Concentration and Glycolic Acid Metabolism

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RESUMO

Prior illumination in CO2-free air enhances a respiration from maize (Zea mays L.) leaves different in onset and duration from the postillumination burst of photorespiration. The course of respiration after brief illumination of attached leaves was measured as CO2 efflux in darkness into CO2-free atmospheres with four O2 concentrations. The peak of CO2 efflux following illumination was suppressed by 2.23% O2, was completely eliminated by 0.04% O2, and was not stimulated by 40% O2 compared with air. Compared with air, steady dark respiration was suppressed by 0.04% O2 but was not affected by 2.23% nor 40% O2. Excision and subsequent uptake of distilled water through the vascular system nearly eliminated the enhanced respiration.

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