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- W287582229 abstract "Stomatal movement was observed under controlled cuvette conditions. When the humidity of the air was changed, stomatal response was linear or slightly curvilinear and exhibited hysteresis. While with detached Vicia faba plants the response became steeper with every succeeding day, curves obtained from rooted plants of Commelina communis had a common regression line during five consecutive days. The influence of air velocity and water supply to the roots were then studied. Increased air velocity (in the range of 0,3-1,3 m × sec-1 made impossible wide stomatal apertures while moderate stomatal opening) was not impeded. Restrictions of water supply (with mannitol solutions) resulted in depressions of opening relative to the humidity range; parallel graphs were obtained. After removing the mannitol from the roots, the original response was resumed. When potassium chloride was added to the water supply, maximum aperture was reached in high humidity. However, the response to changes in humidity was stronger. Rinsing the roots had no effect, but when in imitation of rain, the leaves were exposed to trickling water, the potassium effect was occasionally overcome. The results were discussed in the light of peristomatal transpiration. The view is held that the environmental variables (supply and demand) are cross-correlated and that stomatal response meets the supply-demand-relationship at the level of the subsidiary cell. Hysteresis is explained with the competition between water flux into the guard cell and transpiration of the subsidiary cell. Salt effects are seen in terms of local gradients between cell wall and cell vacuole. Following sudden illumination a steep gradient will enhance salt permeation into the guard cell and with it wide opening. On increased evaporative demand, the steep gradient assists in drawing water from the vacuole, increased closing tendency being the result." @default.
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- W287582229 date "1979-02-01" @default.
- W287582229 modified "2023-09-24" @default.
- W287582229 title "«Peristomatal Transpiration» and Stomatal Movement: A Controversial View" @default.
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- W287582229 doi "https://doi.org/10.1016/s0044-328x(79)80090-2" @default.
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