Light-dependent Influx and Efflux of Potassium of Guard Cells during Stomatal Opening and Closing
- 1 September 1970
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 46 (3) , 483-487
- https://doi.org/10.1104/pp.46.3.483
Abstract
Stomata in epidermal strips of Vicia faba opened in light and closed in darkness when floated on dilute K+ solutions. Opening and closing, respectively, paralleled the fluxes of labeled K+ into and out of the strips. The gain and loss of K+ by the strips were shown by colbaltinitrite stain to be centered at guard cells. Intact epidermal cells, however, appeared to take up K+, complicating interpretation of the data.Keywords
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