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Plant and Cell Physiology, 1982, Vol. 23, No. 7 1169-1174
© 1982

Article

Acid-Induced Stomatal Opening in Commelina communis and Vicia faba

Nobutaka Jinno1 and Susumu Kuraishi

Department of Enviornmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University Hiroshima 730, Japan

The effects of H$ and fusicoccin (FC) on stomatal opening in the dark were investigated using epidermal strips of Commelina communis and Vicia faba cv. Ryosai Issun. Citrate-phosphate buffer induced maximal opening of stomata at pH 3.0 when tested over the range of 2.7 to 5.0. HCl at 1 mM also induced stomatal opening without appreciable accumulation of K$ in the guard cells. After 4 hr treatment with 10 µM FC, stomata opened with concomitant accumulation of K$ in the guard cells, although 1–2 hr treatment caused opening without concomitant K$ increase.

These results suggest that stomatal opening can be caused by salt accumulation and/or changes of the physicochemical conditions in the cell wall of the guard cells due to high acidity.

1 Present address: Biological Laboratory, Faculty of Education, Nagasaki University, Nagasski 852, Japan.

(Received April 30, 1982; Accepted July 17, 1982)
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