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Start Over Creator Franck, F.

1. Plant greening: biogenesis of photosynthetic apparatus in bean leaves irradiated shortly after the germination

Creator:
Schoefs, B., Bertrand, M., and Franck, F.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
Formation of the photosynthetic apparatus in dark-grown 2-day-old beán (Phaseolus vulgaris L.) leaves was studied. The photosystem 2 (PS 2) reaction centres started íunctioning 1 h after the beginning of irradiation. Electron transport between the two photosystems started after 4 h of irradiation. The PS 2 units were able to transfer the excitation energy to each other after 10 h of greening. The photosynthetic activity appeared a long time before the typical 77 K fluorescence bands of green leaves appeared.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Spectroscopic characterization of protochlorophyllide photoreduction in the greening leaf

Creator:
Franck, F., Barthelemy, X., and Srtrzalka, K.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
Room temperature absorbance and 77 K fluorescence measurements were ušed in order to identity Pchlide and Chlide spectral forms involved in protochlorophyllide photoreductíon in greening leaves of barley. Pchlide55o (the subscript refers to the in vivo absorbance maximum of the pigment) is the main photoactíve Pchlide throughout the first 8 h of greening. Its photoreductíon triggers a succession of Chl(ide) spectral forms that are identícal to those normally found after photoreductíon in uitírradiated leaves. Afler an actinic radiation pulse, Chlide5g4 appears within 2 s from an intermediate at shorter wavelength and is transformed to Chlide572 in less than 2 min. The time-scale of the shifts is remarkably shorter than in unirradiated leaves, which is consistent with the acceleratíon of Chl accumulatíon during greening. Pchlide63o and Pchlide64o act as precursors of Pchlide65o during its regeneration, which exhibits a marked inhibition at temperatures above 30 °C.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public