STOMATAL RESPONSES TO CHANGES IN CARBON DIOXIDE CONCENTRATION IN LEAVES TREATED WITH 3‐(4‐CHLOROPHENYL)‐1, 1‐DIMETHYLUREA

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Abstract
Summary: An inhibitor of photophosphorylation, 3‐(4‐chlorophenyl)‐1, 1‐dimethylurea, was supplied to detached leaves via their petioles. The stomata partly closed after the inhibitor had entered the lamina but opened again if the intercellular spaces were flushed with air free of carbon dioxide. It is suggested that the closing movement was a response to the accumulation of carbon dioxide in the intercellular spaces, following the inhibition of photosynthesis. The re‐opening after removal of carbon dioxide demonstrated that stomata could open while photophosphorylation was strongly inhibited. The conclusions from these experiments are discussed in relation to a recent hypothesis of the stomatal mechanism.