Claim · model-written summary
Switching light off during the depolarization phase of an action potential does not change its shape or amplitude in Dionaea muscipula.
- Taxon
- Dionaea muscipula Ellis
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Dionaea muscipulat0 - Treatment
- Switching light offe0
- Outcome
- shape and the amplitudee0
- Direction
- does not changee0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e0“Switching light off in a depolarization phase of an AP does not change its shape and the amplitude”
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.
- Association The amplitude and the rate of potential changes in Dionaea muscipula depend on light intensity.
- 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.
- 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.