S. Wilkinson and W. J. Davies, “Xylem Sap pH Increase: A Drought Signal Received at the Apoplastic Face of the Guard Cell That Involves the Suppression of Saturable Abscisic Acid Uptake by the Epidermal Symplast,” Plant Physiology, Vol. 113, No. 2, 1997, pp. 559-573.

has been cited by the following article:

• TITLE: Do Really Close Stomata by Soil Drying ABA Produced in the Roots and Transported in Transpiration Stream?

  AUTHORS: Joon Sang Lee

  KEYWORDS: Abscisic Acid; Commelina communis L.; Signal Transduction Pathway; Water Stress

  JOURNAL NAME: American Journal of Plant Sciences, Vol.4 No.1, January 31, 2013

  ABSTRACT: Stomatal aperture responses of Commelina communis L. between well watered plants and water stressed plants were investigated. To see the very rapid response to water stress, the plants were directly rooted out from the soil and exposed to the air immediately. Stomata, rooted out from the soil, were totally closed within 10 minutes without any detention time while the stomata of the plants in the soil had been kept opening. These results suggest that stomatal response to the abrupt water stress is very rapid indicating that guard cell itself or leaves could sense water status in the plants.