Light-dependent Influx and Efflux of Potassium of Guard Cells during Stomatal Opening and Closing 1

AUTOR(ES)

Humble, G. D.

RESUMO

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.

Documentos Relacionados

• Evidence for Two Photoreactions and Possible Involvement of Phytochrome in Light-dependent Stomatal Opening 1
• Organic acid and potassium accumulation in guard cells during stomatal opening
• Close correspondence between the action spectra for the blue light responses of the guard cell and coleoptile chloroplasts, and the spectra for blue light-dependent stomatal opening and coleoptile phototropism.
• Expression of Xanthophyll Biosynthetic Genes during Light-Dependent Chloroplast Differentiation1
• Direct Determination of Potassium Ion Accumulation in Guard Cells in Relation to Stomatal Opening in Light