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SODIUM IONS CAN ELIMINATE THE NORMAL DISPARITY IN ABAXIAL AND ADAXIAL STOMATAL OPENING ON ISOLATED EPIDERMES
Author(s) -
PEMADASA M. A.
Publication year - 1983
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1983.tb04493.x
Subject(s) - guard cell , biophysics , chemistry , sodium , botany , stimulation , biology , horticulture , neuroscience , organic chemistry
SUMMARY A comparative study was made of the effects of KCl and NaCl on abaxial and adaxial stomatal responses to light, CO 2 and indole‐3‐acetic acid (IAA) on isolated epidermes of Commelina communis . Although K + and Na + were equally capable of promoting opening, NaCl masked the responses to light, CO 2 and IAA normally occurring in KCl; thus a specific requirement of K + for normal stomatal responses is suggested. NaCl produced equally wide abaxial and adaxial stomatal apertures, so eliminating the disparity in their opening normally found in KCl; the Na + ‐stimulated opening was not a result of a stimulation of K + accumulation in the guard cells. The results suggest that the normal disparity in abaxial and adaxial stomatal opening is specifically linked with differential K + accumulation in the guard cells.