First published online December 19, 2002; 10.1105/tpc.006536
The Plant Cell, Vol. 15, 47-62,
January 2003, Copyright © 2003,
American Society of Plant Biologists
Oxidative Remodeling of Chromoplast Carotenoids
Identification of the Carotenoid Dioxygenase CsCCD and CsZCD Genes Involved in Crocus Secondary Metabolite Biogenesis
Florence Bouviera,
Claude Suireb,
Jérôme Mutterera and
Bilal Camara1,a
a Institut de Biologie Moléculaire des Plantes, Centre National de la Recherche Scientifique and Université Louis Pasteur, 67084 Strasbourg Cedex, France
b Institut de Biochimie et Génétique Cellulaires, Centre National de la Recherche Scientifique, 33077 Bordeaux Cedex, France
1 To whom correspondence should be addressed. E-mail bilal.camara{at}ibmp-ulp.u-strasbg.fr; fax 33-03-8861-4442
The accumulation of three major carotenoid derivativescrocetin glycosides, picrocrocin, and safranalis in large part responsible for the color, bitter taste, and aroma of saffron, which is obtained from the dried styles of Crocus. We have identified and functionally characterized the Crocus zeaxanthin 7,8(7',8')-cleavage dioxygenase gene (CsZCD), which codes for a chromoplast enzyme that initiates the biogenesis of these derivatives. The Crocus carotenoid 9,10(9',10')-cleavage dioxygenase gene (CsCCD) also has been cloned, and the comparison of substrate specificities between these two enzymes has shown that the CsCCD enzyme acts on a broader range of precursors. CsZCD expression is restricted to the style branch tissues and is enhanced under dehydration stress, whereas CsCCD is expressed constitutively in flower and leaf tissues irrespective of dehydration stress. Electron microscopy revealed that the accumulation of saffron metabolites is accompanied by the differentiation of amyloplasts and chromoplasts and by interactions between chromoplasts and the vacuole. Our data suggest that a stepwise sequence exists that involves the oxidative cleavage of zeaxanthin in chromoplasts followed by the sequestration of modified water-soluble derivatives into the central vacuole.
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