Claim · model-written summary
Electrophoretic analysis suggests that the slow phase of the oxygen-evolution increase involves dephosphorylation of the 25 kDa polypeptide of LHC II, by a small extent of 12%.
- Taxon
- higher plantsEmbryophytat0
- Gene
- 25 kDa polypeptide of LHC IIe1
- Outcome
- slow phase of the increase in oxygen evolutione1
- Value
- 12%e1
- Qualifier
- dephosphorylatione1
Not reportedMaterialCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirection
Verbatim
t0“ADAPTATION OF HIGHER PLANTS TO CHANGING LIGHT INTENSITIES”
e1“electrophoretic analysis of 32 P orthophosphate labeled leaf discs adapted to low and high light intensities suggests that the slow phase of the increase in oxygen evolution involves dephosphorylation of the 25 kDa polypeptide of LHC II, by a small extent of 12%”
Title
Holger Dau; Ora Canaani Photochemistry and Photobiology 1992. doi:10.1111/j.1751-1097.1992.tb08536.x
Other claims from this paper (10)
- Intervention effect An increase in light intensity caused a large biphasic increase (up to 120%) in the yield of oxygen evolution in intact leaves.
- Association The fast phase of the increase in oxygen yield was coupled to a decrease of fluorescence in intact leaves.
- Association The slow phase of the increase in oxygen yield was coupled to an increase in the antenna size of photosystem II in intact leaves.
- Intervention effect The slow phase was not inhibited by the uncoupler Nigericin.
- Association The slow phase was absent in chlorophyll-b-less barley mutants deficient in LHC II.
- Mechanism Changes in LHC II-mediated energy distribution, occurring over minutes, are involved in adaptation to changing light intensities.
- Mechanism The trigger for the slow phase of the oxygen-yield increase does not involve oxidation of the plastoquinone pool.
- Intervention effect In response to increased light intensity, the plastoquinone pool became more reduced, as judged by model calculations.
- Mechanism Nigericin experiments suggest that the control of the slow phase of adaptation to increased light intensity is not exerted by the pH gradient across the thylakoid membrane.
- Mechanism Similarities between light-intensity adaptation and the state II to state I transition suggest that both involve LHC II dephosphorylation, possibly triggered by the cytochrome b6/f complex.