Abstract
77 K fluorescence spectra of bean (Phaseolus vulgaris cv Commodore) leaves and cotyledons show the presence of active and inactive protochlorophyllides. The first detected product of the protochlorophyllide photoreduction is the chlorophyllide emitting fluorescence at 690 nm (C690) which is observed one day (leaves) and three days (cotyledons) after sowing. In cotyledons, C690 undergoes the ‘rapid’ and ‘Shibata’ shifts; in leaves, these spectral changes are age-dependent. In order to characterize the formation of C690, we have recorded 298 K fluorescence kinetics at 690 nm and the corresponding absorbance kinetics at 440 nm. The amplitude of the variations of both kinetics increases with the sample age. The absorbance and fluorescence kinetics can be modelized as a monoexponential law. The rate constant of the absorbance and fluorescence kinetics does not significantly change during the studied period (except for old cotyledons). The results presented in this paper give evidences for a low energy transfer between pigments during the photoreduction of protochlorophyllide at room temperature.
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Abbreviations
- Ax:
-
absorbance intensity measured at x nm
- Chlide:
-
chlorophyll(ide)
- A.U.:
-
arbitrary unit
- Cx:
-
chlorophyll(ide) fluorescing at x nm at 77 K
- Fx:
-
fluorescence intensity measured at x nm
- PCR:
-
NADPH:protochlorophyllide oxidoreductase (EC 1.6.99.1)
- Pchlide:
-
protochlorophyllide
- Px:
-
protochlorophyllide fluorescing at x nm at 77K
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Schoefs, B., Garnir, HP. & Bertrand, M. Comparison of the photoreduction of protochlorophyllide to chlorophyllide in leaves and cotyledons from dark-grown bean as a function of age. Photosynth Res 41, 405–417 (1994). https://doi.org/10.1007/BF02183043
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DOI: https://doi.org/10.1007/BF02183043