Claim · model-written summary
The amplitude and the rate of potential changes in Dionaea muscipula depend on light intensity.
- Taxon
- Dionaea muscipula Ellis
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Dionaea muscipulat0 - Treatment
- light intensitye0
- Outcome
- amplitude as well as the rate of potential changese0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e0“The amplitude as well as the rate of potential changes depend on light intensity”
t0“Dionaea muscipula Ellis”
Title
Action Potentials Evoked by Light in Traps of Dionaea muscipula Ellis
K. Trebacz; A. Sievers Plant and Cell Physiology 1998. doi:10.1093/oxfordjournals.pcp.a029379
Other claims from this paper (12)
- Observation At low light intensities (below 50 μmol m−2 s−1), illumination evokes transient depolarization of membrane potential in mesophyll cells of the Dionaea muscipula leaf-trap.
- Observation Darkening causes hyperpolarization in Dionaea muscipula that is approximately symmetric to the response to illumination.
- Observation Above a definite light threshold (usually between 50 and 80 μmol m−2s−1) the depolarization acts as a generator potential and an all-or-none action potential is released in Dionaea muscipula.
- Intervention effect Switching light off during the depolarization phase of an action potential does not change its shape or amplitude in Dionaea muscipula.
- Observation When light intensity is increased to 80–150 μmol m−2 s−1, a single light stimulus triggers two successive action potentials in Dionaea muscipula.
- Association The time interval between the two action potentials decreases with increasing stimulus strength and reaches its minimum between 300 and 400 μmol m−2 s−1.
- Association At higher light intensities the interval between the two action potentials increases again.
- Observation At still higher light intensities only a single action potential is triggered.
- Observation The electrical effect was evoked by light and not by the temperature change accompanying illumination.
- Intervention effect DCMU, an inhibitor of the photosynthetic electron transport chain, blocked the generator potentials mediating between light absorption and action potentials.
- Intervention effect Residual responses to light stimuli in DCMU-treated plants had reversed polarity.
- Intervention effect Residual responses to light stimuli in DCMU-treated plants had strongly reduced amplitudes.