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  • Blackwell Publishing Ltd  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    The non-osmotic volume of Commelina guard cells (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The non-osmotic volume (NOV) of Connnelina communis L. guard cells was estimated by observing the volumes of guard cell protoplasts incubated in mannitol solutions of different solute potential, and applying the Boyle-van't Hoff relation to the results. NOV values of between 517 and 1782 μm3 were obtained for different batches of protoplasts. There was a negative correlation between NOV and apparent protoplast solute contents, and the NOV and solute content were observed to alter when pretreatments affecting stomatal aperture were given. H is hypothesized that changes in guard cell chloroplast starch levels could account for variation in NOV and solute content.For closed stomata, it is calculated that the NOV could reduce the proportion of the total guard cell volume which is osmotically active by over 40%. Serious inaccuracy may thus result if the NOV is not taken into account in the estimation of guard cell solute potential or solute concentration from measurements of solute levels per cell. The error is maximal at low stomatal apertures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1982.tb00942.x
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative analysis of the control of physiological phenomena by plant hormones (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 95 (1995), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We highlight the need to combine information about hormone concentrations and tissue sensitivity when assessing control of physiological phenomena by plant hormones. A quantitative approach to this problem is suggested and the method illustrated using data for stomatal closure induced by abscisic acid. The technique requires accurate estimates of hormone concentration at the putative site of action and information about the kinetics of responses in the form of dose-response curves obtained under relevant conditions. Extending this approach, hormonal control is seen as relative, in that it must be considered against a background of other controlling influences. Possible means of evaluating this ‘control potential’ from dose-response curves are discussed. Finally, we draw together the above in an analytical framework for assessing hormonal control. This involves (1) matching observed and predicted responses; (2) studying effects of manipulating hormone concentration or sensitivity; and (3) assessing the relative control potential of the compound of interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1995.tb00867.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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Guard cell protoplasts – Aspects of work with an important new research tool (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 58 (1983), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb04189.x
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