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Guard cell responses to potassium ferricyanide
Author(s) -
Vavasseur Alain,
Lascève Gérard,
Cousson Alain
Publication year - 1995
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1995.tb02225.x
Subject(s) - fusicoccin , potassium ferricyanide , guard cell , ferricyanide , chemistry , potassium , biophysics , atpase , biochemistry , inorganic chemistry , biology , enzyme , organic chemistry
Micromolar concentrations of potassium ferricyanide inhibit light‐induced stomatal opening. The extent of the inhibition is dependent on the presence of carbon dioxide and the concentration of potassium ferricyanide needed to obtain 50% inhibition of stomatal opening is 40‐fold higher in CO 2 ‐free air than in normal air. The fungal toxin, fusicoccin (1 μ M ), overcame the ferricyanide inhibition of stomatal opening indicating that the electron acceptor may interact more or less directly with the activity of the plasma membrane H + ‐ATPase. Although potassium ferricyanide strongly inhibited stomatal opening, it had only minor effects on stomatal maintaining or stomatal closure due to darkness or ABA.