Abstract
THE effect of carbon dioxide-free air in producing stomatal opening is well known, but practically nothing is known concerning the biochemistry of its action. Some recent work has revealed that the metabolism of glycollic acid may be implicated in stomatal movements and an attempt has been made to explain the response to low carbon dioxide tension in terms of a promotion of glycollic acid synthesis1–3. Stomatal opening in response to low carbon dioxide levels appears to have been considered purely as a light reaction; it is stated3 that “low concentrations of carbon dioxide in light are necessary in order to obtain large stomatal widths”. The fact is, however, that opening due to the removal of carbon dioxide can occur in the absence of light. This was observed in 1948 by Heath for Pelargonium4, and by several authors since, including Stalfelt5.
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