Wavelength-dependent photooxidation and photoreduction of protochlorophyllide and protochlorophyll in the innermost leaves of cabbage (Brassica oleracea var. capitata L.)

Photosynthesis Research
Anna Laura ErdeiBéla Böddi

Abstract

The photoreduction and photooxidation processes of different protochlorophyll(ide) forms were studied in the innermost leaves of cabbage (Brassica oleracea var. capitata L.) under monochromatic irradiations. Room-temperature fluorescence emission spectra were measured from the same leaf spots before and after illumination to follow the wavelength dependence of the photochemical reactions. Short-wavelength light of 7 µmol photons m(-2) s(-1) (625-630 nm) provoked mainly bleaching, and longer wavelengths (630-640 nm) caused both bleaching and photoreduction, while above 640 nm resulted in basically photoreduction. When bleached leaves were kept in darkness at room temperature, all protochlorophyll(ide) forms regenerated during 72 h. Oxygen-reduced environment decreased the extent of bleaching suggesting the involvement of reactive oxygen species. These results confirm that the short-wavelength, 628 nm absorbing, and 633 nm emitting protochlorophyll(ide) form in etiolated cabbage leaves sensibilizes photooxidation. However, the 628 nm light at low intensities stimulates the photoreduction of the longer wavelength protochlorophyllide forms. Kinetic measurements showed that photoreduction saturates at a low PFD (photon flux density)...Continue Reading

References

Aug 18, 1999·Proceedings of the National Academy of Sciences of the United States of America·N Lebedev, M P Timko
Jun 28, 2001·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·M Kirsch, H De Groot
Oct 19, 2001·Proceedings of the National Academy of Sciences of the United States of America·R MeskauskieneK Apel
Jun 7, 2005·Journal of Photochemistry and Photobiology. B, Biology·Jerzy Kruk
Oct 18, 2005·Photosynthesis Research·V P Domanskii, W Rüdiger
Jan 18, 2007·Annual Review of Plant Biology·Ryouichi Tanaka, Ayumi Tanaka
Feb 20, 2008·Biochemistry. Biokhimii︠a︡·O B Belyaeva, F F Litvin
Apr 9, 2010·Plant & Cell Physiology·Andreas RichterOlaf Czarnecki

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