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Peri stomatal transpiration and stomatal movement a controversial view part 2 observation of stomatal movements under different conditions of water supply and demand



Peri stomatal transpiration and stomatal movement a controversial view part 2 observation of stomatal movements under different conditions of water supply and demand



Zeitschrift fuer Pflanzenphysiologie 91(2): 157-172



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 5 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 .times. s-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 KCl was added to the water supply, maximum aperture was reached in high humidity. 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 K effect was occasionally overcome. The results were discussed in the light of peristomatal transpiration. Possibly the environmental variables (supply and demand) are cross-correlated and stomatal response may meet 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.

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