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Title of Journal: Photosynth Res

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Abbravation: Photosynthesis Research

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Springer Netherlands

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ISSN

1573-5079

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The photoenzymatic cycle of NADPH protochlorophyl

Authors: Benoît Schoefs Fabrice Franck
Publish Date: 2007/11/03
Volume: 96, Issue: 1, Pages: 15-26
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Abstract

The photoenzymatic cycle of the lightdependent NADPHprotochlorophyllide oxidoreductase LPOR was investigated in situ during early stages of development of bean leaves under lightdark cycles LDC In the experimental system used in this study prolamellar bodies developed during night periods and disappeared during light periods This was accompanied by changes in the photoactive to nonphotoactive Pchlide ratio which was higher at the end of the light period and tended to increase with the number of LDC’s Flashinduced absorbance changes in the Chlide absorption region 700 nm were used in order to monitor the formation of short and longwavelength forms of Chlide C670–675 and C682–694 which correspond to free Chlide and aggregated ChlideNADPHLPOR complexes respectively The ratio of longwavelength to shortwavelength Chlides after one flash increased with the number of LDC’s and was higher in leaves collected at the end of light periods compared to leaves collected at the end of night periods During light periods photoactive Pchlide regeneration and Chlide phytylation were completed within 1 min after flashinduced formation of longwavelength Chlide The results show for the first time that the photoenzymatic LPOR cycle proceeds through similar steps but at much faster rates during photoperiodic greening than in the previously studied leaves of etiolated plants In particular the parallel formation of two Chlide species always occurs but the ratio of the two species depends on the ratio of photoactive to nonphotoactive Pchlide and on light or dark adaptation


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  2. Significance of molecular crowding in grana membranes of higher plants for light harvesting by photosystem II
  3. Structures and functions of the extrinsic proteins of photosystem II from different species
  4. Crassulacean acid metabolism (CAM) in an epiphytic ant-plant, Myrmecodia beccarii Hook.f. (Rubiaceae)
  5. The diversity and complexity of the cyanobacterial thioredoxin systems
  6. Reconstituted CP29: multicomponent fluorescence decay from an optically homogeneous sample
  7. A photoacoustic method for rapid assessment of temperature effects on photosynthesis
  8. Photosynthesis-related quantities for education and modeling
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  10. H-transfers in Photosystem II: what can we learn from recent lessons in the enzyme community?
  11. Molecular signatures for the main phyla of photosynthetic bacteria and their subgroups
  12. Optimization of photosynthesis by multiple metabolic pathways involving interorganelle interactions: resource sharing and ROS maintenance as the bases
  13. Production of reactive oxygen species in decoupled, Ca 2+ -depleted PSII and their use in assigning a function to chloride on both sides of PSII
  14. Tracking the molecular evolution of photosynthesis through characterization of atomic contents of the photosynthetic units
  15. What governs the reaction center excitation wavelength of photosystems I and II?
  16. Fluorescence spectroscopy of reconstituted peridinin–chlorophyll–protein complexes
  17. Wide-field photon counting fluorescence lifetime imaging microscopy: application to photosynthesizing systems
  18. Photosynthetic carbon acquisition in Sargassum henslowianum (Fucales, Phaeophyta), with special reference to the comparison between the vegetative and reproductive tissues
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