NDLI: Dominance of a 675 nm chlorophyll(ide) form upon selective 632.8 or 654 nm laser illumination after partial protochlorophyllide phototransformation

Content Provider	Springer Nature Link
Author	Kósa, Annamária Böddi, Béla
Copyright Year	2012
Abstract	The phototransformation pathways of protochlorophyllide forms were studied in 8–14-day-old leaves of dark-germinated wheat (Triticum aestivum L.) using white, 632.8 nm He–Ne laser and 654 nm laser diode light. The photon flux density (PFD) values (0.75–360 μmol photons m$^{−2}$ s$^{−1}$), the illumination periods (20 ms–10 s) and the temperature of the leaves (between −60 °C and room temperature) were varied. The 77 K fluorescence spectra of partially phototransformed leaves showed gradual accumulation or even the dominance of the 675 nm emitting chlorophyllide or chlorophyll form at room temperature with 632.8 nm of PFD less than 200 μmol photons m$^{−2}$ s$^{−1}$ or with 654 nm of low PFD (7.5 μmol photons m$^{−2}$ s$^{−1}$) up to 1 s. Longer wavelength (685 or 690 nm) emitting chlorophyllide forms appeared at illuminations under −25 °C with both laser lights or at room temperature when the PFD values were higher or the illumination period was longer than above. We concluded that the formation of the 675 nm emitting chlorophyllide form does not indicate the direct photoactivity of the 633 nm emitting protochlorophyllide form; it can derive from 644 and 657 nm forms via instantaneous disaggregation of the newly-produced chlorophyllide complexes. The disaggregation is strongly influenced by the molecular environment and the localization of the complex.
Starting Page	111
Ending Page	120
Page Count	10
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	114
Issue Number	2
e-ISSN	15735079
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-10-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chlorophyllide form Etiolated wheat Laser illumination Protochlorophyllide phototransformation 77 K fluorescence emission Plant Physiology Plant Genetics & Genomics Biochemistry Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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Dominance of a 675 nm chlorophyll(ide) form upon selective 632.8 or 654 nm laser illumination after partial protochlorophyllide phototransformation

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