1955
DOI: 10.1111/j.1399-3054.1955.tb07753.x
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The Stomata as a Hydrophotic Regulator of the Water Deficit of the Plant

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Cited by 119 publications
(34 citation statements)
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“…Addition of mannitol in a concentration of 10"^ M proved to be necessary to enable the stomata to respond 'normally' to factors such as light and darkness and changes in CO2 concentration (a 'normal' response being defined as one similar to that observed on intact leaves). Stalfelt (1955) has shown that over-hydration can lead to a reduction in stomatal aperture and this may have been the factor involved here, although if so it is surprising that the osmotic pressure produced by such a low concentration of mannitol was sufficient to overcome Stalfelt's 'sub-optimal water deficit'. This question is being investigated further, and meanwhile for the present work io~^ M mannitol was added in order to ensure 'normal' behaviour of the stomata.…”
Section: Methodsmentioning
confidence: 91%
“…Addition of mannitol in a concentration of 10"^ M proved to be necessary to enable the stomata to respond 'normally' to factors such as light and darkness and changes in CO2 concentration (a 'normal' response being defined as one similar to that observed on intact leaves). Stalfelt (1955) has shown that over-hydration can lead to a reduction in stomatal aperture and this may have been the factor involved here, although if so it is surprising that the osmotic pressure produced by such a low concentration of mannitol was sufficient to overcome Stalfelt's 'sub-optimal water deficit'. This question is being investigated further, and meanwhile for the present work io~^ M mannitol was added in order to ensure 'normal' behaviour of the stomata.…”
Section: Methodsmentioning
confidence: 91%
“…The ATP photochemically generated by cyclic photophosphorylation may be used not only for CO2 assimilation but also for other ATP-requiring cellular activities (11). One example of such "nonphotosynthetic" use of ATP derived from cyclic photophosphorylation is amino acid incorporation by isolated chloroplasts (46 is curtailed or stopped altogether because of the well-known midday closure of stomata in leaves (47,48). A curtailment of CO2 assimilation would result in an accumulation of NADPH; hence the possibility arose that NADPH might have an effect on the operation of cyclic photophosphorylation.…”
Section: Resultsmentioning
confidence: 99%
“…The water deficit is a very powerful regulator. When the defi cit rises above the critical value, it overrides all opening stimuli and causes closing even in high intensity light (81) or in CO2-free air (82). The water deficit is the only regulator of the aperture of the hydathodes in the wheat coleoptile (83).…”
Section: Environmental Factors Controlling Stomatal Movementmentioning
confidence: 99%