Abstract
A newly developed nitrogen laser fluorimeter insensitive to actinic illumination was used to follow simultaneously the light induced changes in red and blue fluorescence of intact isolated spinach chloroplasts and leaf pieces. The recorded variable blue fluorescence was linked to a water soluble component of intact isolated chloroplasts, depended on Photosystem I, and was related to changes in carbon metabolism. From the comparison of changes in intact and broken chloroplasts and from fluorescence spectra under different conditions, it was concluded that the variation in NADPH was the major cause for the changes in blue fluorescence. This study opens a path towards continuous and non-destructive monitoring of NADPH redox state in chloroplasts and leaves.
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Abbreviations
- Chl:
-
chlorophyll
- DHAP:
-
dihydroxyacetone phosphate
- DLGA:
-
DL-glyceraldehyde
- FNR:
-
ferredoxin-NADP reductase
- FWHM:
-
full width at half maximum
- LED:
-
light emitting diodes
- OAA:
-
oxaloacetate
- qN :
-
non-photochemical quenching
- PGA:
-
3-phosphoglycerate
- Pi:
-
inorganic orthophosphate
- qP :
-
photochemical quenching
- PPFD:
-
photosynthetic photon flux density
- QA :
-
primary quinone acceptor of Photosystem II
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Cerovic, Z.G., Bergher, M., Goulas, Y. et al. Simultaneous measurement of changes in red and blue fluorescence in illuminated isolated chloroplasts and leaf pieces: The contribution of NADPH to the blue fluorescence signal. Photosynth Res 36, 193–204 (1993). https://doi.org/10.1007/BF00033038
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DOI: https://doi.org/10.1007/BF00033038