Claim · model-written summary
The authors proposed that excess excitation energy could produce reactive oxygen species, trigger antioxidants, and damage photosystem II activity.
- Taxon
- rice
Oryza sativat0 - Outcome
- photochemical activity of PS IIe0
- Qualifier
- might lead to the production of reactive oxygen speciese0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the excess excitation energy still occurred and might lead to the production of reactive oxygen species triggering the antioxidant system. However, it could still damage photosynthetic apparatus and result in the reduction of photochemical activity of PS II”
t0“rice”
Title
Reason for photosynthetic declination in rice from water stress induced by polyethylene glycol (PEG)
Junwei Sun; Yong Yang; Zongan Huang; et al. Zhongguo shuidao kexue 2004
Other claims from this paper (11)
- Intervention effect At 10% PEG, rice net photosynthetic rate declined significantly.
- Intervention effect At 10% PEG, stomatal conductance and intercellular CO2 concentration rose slightly.
- Intervention effect At 10% PEG, chlorophyll fluorescence parameters and photosynthetic pigment content changed little.
- Mechanism At 10% PEG, the authors attributed reduced photosynthesis to factors other than stomatal limitation.
- Intervention effect At 15% PEG, rice pigment content and fluorescence parameters began to change.
- Intervention effect At 15% PEG, net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration declined.
- Mechanism At 15% PEG, stomatal conductance became a principal limitation on photosynthesis.
- Intervention effect At 20% PEG, photosynthetic rate, stomatal conductance, fluorescence parameters, and pigment content fell further.
- Intervention effect At 20% PEG, intercellular CO2 concentration did not decline further.
- Mechanism At 20% PEG, the authors attributed photosynthetic decline largely to photosynthetic membrane damage.
- Observation Severe water stress reduced light-energy harvesting and transfer ability in rice.