As to the Mode of Action of the Guard Cells in Dry Air
227
moment due to forces directed inwards from the poles of the guard cells. To
develop this notion further in the form of a realistic model of guard cell
mechanics would require more knowledge of the elastic properties of component parts of a guard cell than we have, or are likely to acquire by direct
means. Support for the idea is more likely to emerge from the reverse
procedure: deconvolution of data relating to turgor pressure, cell volume,
and cell shape.
Acknowledgments. Without the opportunity afforded me by Otto Lange to think and
work in his laboratory, the ideas I have described here, such as they are, would not have
come to fruition. Without his contribution to the study of stomata, involving, as did the
work of Darwin and Stahl in the last century, meticulous and ingenious experiment
informed by speculation about the adaptive function of stomata, they would not have
been conceived.
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