Claim · model-written summary
At low excitation intensities, guard cell chloroplasts showed minimal quenching from P to steady state fluorescence compared with mesophyll chloroplasts.
- Taxon
- Saxifraga cernua
Saxifraga cernuae0 - Organ / stage
- guard cell plastidse1
- Outcome
- quenching from P to steady state fluorescencee1
- Direction
- minimale1
- Qualifier
- At low excitation intensitiese1
- Comparator
- mesophyll chloroplastse1
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll fluorescence induction curves from mesophyll and guard cell chloroplasts of Saxifraga cernua”
e1“At low excitation intensities, the fast fluorescence kinetics from guard cell plastids showed an extended I to D phase and a more rapid appearance of P while minimal quenching from P to steady state fluorescence was observed compared to the transients from mesophyll chloroplasts”
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 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.
- Mechanism Photosystems I and II of guard cell chloroplasts contribute to light-dependent stomatal activity only at high light intensities.