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  • 2000-2004  (1)
  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Relative control potential of abscisic acid, carbon dioxide and light in responses of Phaseolus vulgaris stomata (2001)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 111 (2001), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We outline a theoretical framework for comparing the relative effectiveness of hormonal and other factors in the control of physiological responses. This involves determining a ‘baseline’ set of conditions, then adjusting each factor in turn with the others held constant. The initial rate of response to each change in condition is estimated and compared among factors to arrive at a quantitative indication of control potential under the specified baseline conditions – the control coefficient. The suitability of the stomatal response as a model system for such studies is discussed. A portable infra-red gas analyser was used to investigate the control potential of abscisic acid (ABA), CO2 and light – measured as photosynthetic photon flux density (PPFD) – over responses of Phaseolus vulgaris L. stomata at baseline conditions appropriate to an unstressed plant under moderate light conditions. The ranking of control coefficients observed under these conditions was light〉CO2〉ABA. The control coefficients of CO2 and ABA were 0.28 and 0.11 times that of light, respectively. These results are discussed in relation to the sensitivity of the plant material and the experimental conditions. Implications for a hormonal role for ABA in the control of stomatal movements are considered. We conclude that this method can provide valuable information concerning the relative control potential of hormonal and other influences in the context of differences in baseline conditions and in relation to changes in sensitivity of plant material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.2001.1110320.x
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  • 2
    Electronic Resource
    Electronic Resource
    Potassium ion uptake by swelling Commelina communis guard cell protoplasts (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 66 (1986), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Commelina communis L. guard cell protoplasts were induced to swell under low CO2 conditions in the light while incubated in media containing KCl. Precise measurements of changes in the volume of the protoplasts were made including estimates of protoplast non-osmotic volume by Boyle-van't Hoff analysis. The amount of K+ which accumulated during the treatment was measured. The observed changes in osmotic volume could be accounted for by the uptake of K+ which appeared to be balanced by an anion or anions with an effective mean charge of – 1.63. The K+ flux rates occurring in guard cell protoplasts were sufficient to explain guard cell turgor regulation in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1986.tb05953.x
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  • 3
    Electronic Resource
    Electronic Resource
    Volume changes of Commelina communis guard cell protoplasts in response to K+, light and CO2 (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 66 (1986), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effects of K+ concentration, light intensity and CO2 levels on the volume of Commelina communis L. guard cell protoplasts were studied. Two degrees of swelling response were observed, both dependent on an external supply of K+, but not necessarily on the supply of a permeant anion. The presence of K+ itself, independent of light or CO2 level, stimulated swelling at a relatively slow rate. When K+, light and low CO2 conditions were supplied together, the swelling was relatively rapid and of high magnitude. The rapid swelling was specific for K+ and Rb+ giving a half maximal effect after 2 h at a KCl concentration of about 18 mmol m−3. The addition of CaCl2 at 1 mol m−3 inhibited K+-dependent swelling under all conditions tested. The response to light and low CO2 levels by Commelina guard cell protoplasts is thought to reflect a high degree of physiological integrity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1986.tb05952.x
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