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Epidermal strips of Vicia faba were floated on 10 millimolar KCl at various temperatures and for several time periods. The diameter of the stomatal aperture was determined microscopically and K(+) content was estimated and expressed as the per cent of the guard cell stained. Stomatal opening was associated with increased K(+) in guard cells, but the quantitative association was modified both by time and temperature. At low temperatures (0-20 C) there was a prolonged Spannungsphase while at higher temperatures (30-45 C) motorphase was exhibited. During the motorphase there was a rapid opening of the stomates which was highly correlated with K(+) influx. At treatment periods of 360 minutes and temperatures higher than 25 C there appeared to be a maintenance phase during which K(+) concentration of the guard cells decreased without an equivalent decrease in aperture.

Relationship of Temperature to Stomatal Aperture and Potassium Accumulation in Guard Cells of Vicia faba