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© 1987 Oxford University Press

RESEARCH-ARTICLE

Measurement of the Apoplastic Activity of K+ and Cl– in the Leaf Epidermis of Commelina communis in Relation to Stomatal Activity

D. J. F. BOWLING

Department of Plant Science, University of Aberdeen Old Aberdeen AB9 2UD, Scotland, U.K.

Correspondence to. Department of Plant Science, University of Aberdeen, Old Aberdeen AB9 2UD, Scotland, U.K.

Bowling, D. J. F. 1987. Measurement of the apoplastic activity of K+ and Cl– in the leaf epidermis of Commelina communis in relation to stomatal activity.–J. exp. Bot. 38: 1351–1355.

Ionic activity of K+ and Cl– in the apoplast of the lower epidermis of the leaf of Commelina communis was measured using ion selective micro-electrodes. Large gradients across the stomatal complex were observed which were related to stomatal aperture. On stomatal closure the activity of K+ and Cl– in the apoplast of the guard cell rose from 3·0 mol m–3 to 100 mol m–3 and 33 mol m–3 respectively. It was concluded that the apoplast is an important pathway for ion transport between the cells.

Key words: Stomata, ionic activity, leaves, apoplast


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