Abstract
Summary The greening response of etiolated wheat seedlings upon exposure to light has been studied in atmospheres of various gases and gas mixtures. In the presence of high levels (> 95 %) of oxygen, nitrogen, hydrogen or helium, greening occurs normally, and there is a requirement for small amounts of oxygen. Greening is completely inhibited, however, by high levels of carbon dioxide, methane, or ethylene, and is partially inhibited by carbon monoxide. The inhibition of greening by carbon dioxide is due in part to pH, and in part to interference with one or more of the decarboxylation reactions of chlorophyll biosynthesis. Experiments with cyanide, azide, and dinitrophenol demonstrate the requirement for metabolic energy derived from respiration and oxidative phosphorylation.
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