The epidermis of the leaf of Zea mays transmits changes it water potential in the water supply of the leaf to the Stomata within 0.1 second. Reduction in water supply can caluse the subsidiary cells surrounding the stomata to collapse within 1.5 minutes, and the epidermis to shrink to one-third of its original thickness within 20 minutes.
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Klaus Raschke (1970) studied this question.
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