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Respiration of Leaves in Light and Darkness¹

Leaves of six species were placed in a plexiglass chamber. CO_2-free air was admitted to the chamber and the CO₂ concentration in the egress air determined in both light and darkness.

The rate of CO₂ evolution from the leaves of five species decreased when they were first lighted, passed through a minimum ("dip"), then increased to a higher rate than the original dark rate ("illumination plateau"). Upon darkening, the rate of CO₂ evolution rapidly increased to a rate higher than the illumination plateau ("dark surge"), then gradually decayed to the original steady state dark respiration rate. Thus, light enhances a reaction which leads to additional CO₂ evolution above normal dark respiration for many species when the CO₂ concentration in the atmosphere is low.

Maize did not have this light-stimulated CO₂ evolution.

² Crop Physiologist.

Received for publication January 24, 1966.