NDLI: On the nature of the two pathways in chlorophyll formation from protochlorophyllide

Content Provider	Springer Nature Link
Author	Domanskii, V. P. Rüdiger, W.
Copyright Year	2001
Abstract	The kinetics of formation of esterified chlorophyll in etiolated barley (Hordeum vulgare L.) leaves after illumination with a single flash was studied. It was found that after partial (14–24%) and after full photoreduction of protochlorophyllide, the same quantity of esterified products appear during the first 5 s after the flash. The rest of formed chlorophyllide was esterified in a slow process during at least 30 min at 15 °C. The product of fast esterification can be correlated with ‘short-wavelength’ chlorophyll, characterized by a fluorescence emission peak at 673–675 nm. This is the only chlorophyll form detectable within 20 s after partial (14%) photoconversion, and it appears at the same time as the shoulder of the chlorophyll(ide) fluorescence after full photoconversion. The main product after full photoconversion shows a fluorescence at 689 nm shifting in darkness within 15 s to 693 nm and then within 30 min to 682 nm (Shibata shift). The slow esterification proceeds with similar kinetics as the Shibata shift. We propose that the fast esterification of only part of total chlorophyllide after full photoconversion of protochlorophyllide in etiolated leaves reflects the restricted capacity of the esterifying system. The slow esterification of the residual chlorophyllide may be time-limited by its release from protochlorophyllide oxidoreductase, by disaggregation of prolamellar bodies and by diffusion of tetraprenyl diphosphates towards chlorophyll synthase.
Starting Page	131
Ending Page	139
Page Count	9
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	68
Issue Number	2
e-ISSN	15735079
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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