Claim · model-written summary
Photosystems I and II of guard cell chloroplasts contribute to light-dependent stomatal activity only at high light intensities.
- Taxon
- S. cernua
Saxifraga cernuae6 - Organ / stage
- guard cell chloroplast photosystems I and IIe6
- Outcome
- light-dependent stomatal activitye6
- Qualifier
- only at high light intensitiese6
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“S. cernua guard cell chloroplast photosystems I and II contribute to light-dependent stomatal activity only at high light intensities”
Title
Comparative Studies of Fluorescence from Mesophyll and Guard Cell Chloroplasts in Saxifraga cernua
Bruce T. Mawson; Angus Franklin; W. Gary Filion; et al. PLANT PHYSIOLOGY 1984. doi:10.1104/pp.74.3.481
Other claims from this paper (7)
- Observation At low excitation intensities, guard cell chloroplasts showed an extended I to D phase in fast fluorescence induction compared with mesophyll chloroplasts.
- Observation At low excitation intensities, guard cell chloroplasts showed a more rapid appearance of P compared with mesophyll chloroplasts.
- Observation At low excitation intensities, guard cell chloroplasts showed minimal quenching from P to steady state fluorescence compared with mesophyll chloroplasts.
- Observation As excitation intensity increased, quenching rates of guard cells were faster at initiating conditions for photophosphorylation.
- Observation At increased excitation intensity, fast and slow fluorescence kinetics of guard cells resembled those of mesophyll cells.
- Observation Guard cell chloroplasts of S. cernua showed a 77 K fluorescence emission spectrum with three major peaks at 685, 695 and 730 nm when excited at 440 nm.
- Observation The 77 K emission spectrum of guard cell chloroplasts was qualitatively similar to that of mesophyll tissue.