Claim · model-written summary
UV-B-dependent inhibition of maximum photochemical yield of PSII recovered in parallel to the buildup of epidermal screening against UV-B.
- Taxon
- Vitis vinifera
Vitis viniferae0 - Organ / stage
- dark-adapted leavese6
- Treatment
- UV-B radiatione6
- Outcome
- maximum photochemical yield of photosystem II (PSII)e6
- Direction
- recoverede6
- Qualifier
- in parallel to the buildup of epidermal screeninge6
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grape (Vitis vinifera cv Silvaner) vine plants were cultivated under shaded conditions in the absence of ultraviolet (UV) radiation in a greenhouse, and subsequently placed outdoors under three different light regimes for 7 d”
e6“UV-B-dependent inhibition of maximum photochemical yield of photosystem II (PSII), measured as variable fluorescence of dark-adapted leaves, recovered in parallel to the buildup of epidermal screening for UV-B radiation, suggesting that PSII is protected against UV-B damage by epidermal screening”
Title
C. A. Kolb PLANT PHYSIOLOGY 2001. doi:10.1104/pp.127.3.863
Other claims from this paper (10)
- Intervention effect All light treatments increased hydroxycinnamic acid concentrations in grape leaves during exposure.
- Intervention effect Hydroxycinnamic acid concentrations rose highest, to 230% of the initial value, when UV radiation was absent.
- Intervention effect UV-B radiation specifically increased flavonoid concentrations in grape leaves by more than 10-fold.
- Association UV transmittance of extracted phenolics was lower than epidermal UV transmittance.
- Association UV transmittance of extracted phenolics and epidermal UV transmittance were curvilinearly related.
- Mechanism Curvilinearity between the two transmittance measures is suggested to result from different absorption properties of dissolved extracts and the non-homogeneous epidermal distribution of phenolics.
- Mechanism PSII is suggested to be protected against UV-B damage by epidermal screening.
- Intervention effect UV-B inhibition of CO2 assimilation rates was not diminished by efficient UV-B screening.
- Mechanism Protection of PSII against UV-B inactivation is suggested to occur because preceding damage is efficiently repaired.
- Mechanism Factors determining UV-B inhibition of CO2 assimilation are suggested to recover more slowly.