Abstract
IN your issue of August 10, 1911, you were good enough to publish a brief description of my “Stomatograph” (Proc. Roy. Soc., B., vol. lxxxv., p. 33). I there pointed out that the stomatal aperture in Egyptian cotton plants under field conditions during June reaches its maximum at about 9 a.m., and that this maximum aperture is maintained for only a few hours at most, closure ensuing as the result of the severe water-strain on the root-system. Thus the stomata may be almost completely closed by noon, or even earlier.
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BALLS, W. Photosynthesis and Stomatal Aperture. Nature 89, 555 (1912). https://doi.org/10.1038/089555a0
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DOI: https://doi.org/10.1038/089555a0
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