Claim · model-written summary
Guard cell potential showed no specificity for alkali ions (except Li+), ammonium or choline.
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Verbatim
e0“Guard cells of several species, but predominantly Commelina communis, were impaled by micropipette electrodes”
e7“No specificity for any alkali ion (except Li(+)), ammonium, or choline appeared”
Title
Electrical Potentials in Stomatal Complexes
Robert A. Saftner; Klaus Raschke PLANT PHYSIOLOGY 1981. doi:10.1104/pp.67.6.1124
Other claims from this paper (12)
- Observation The guard cell wall developed a Donnan potential between -60 and -70 mV in 30 mM KCl at pH 7.
- Observation The density of fixed charges in the guard cell wall ranged from 0.3 to 0.5 molar.
- Association The pH dependence of the wall fixed-charge density was almost identical to the titration curve of polygalacturonic acid.
- Association Vacuolar potential of C. communis guard cells was almost linearly related to stomatal aperture.
- Association Vacuolar potential of C. communis guard cells responded to ionic strength changes in the bathing medium in a Nernstian manner.
- Association Lithium caused hyperpolarization of guard cells.
- Association Calcium at 1 to 100 millimolar in the medium led to stomatal closure.
- Association Calcium at 1 to 100 millimolar in the medium caused hyperpolarization of guard cells.
- Observation Calcium at 1 to 100 millimolar triggered transient oscillations in the intracellular potential of guard cells.
- Observation Gradients in the electrical potential existed across stomatal complexes with open pores.
- Observation When stomata closed, the potential gradients across stomatal complexes almost disappeared or slightly reverted.
- Observation With stomata closed, all epidermal cells were at potentials near -30 mV in 30 mM KCl.