Oxidative Remodeling of Chromoplast Carotenoids: Identification of the Carotenoid Dioxygenase CsCCD and CsZCD Genes Involved in Crocus Secondary Metabolite Biogenesis
AUTOR(ES)
Bouvier, Florence
FONTE
American Society of Plant Biologists
RESUMO
The accumulation of three major carotenoid derivatives—crocetin glycosides, picrocrocin, and safranal—is 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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=143450Documentos Relacionados
- Chromoplast Biogenesis in Cucumis sativus Corollas (Rapid Effect of Gibberellin A3 on the Accumulation of a Chromoplast-Specific Carotenoid-Associated Protein).
- Implications of Carotenoid Biosynthetic Genes in Apocarotenoid Formation during the Stigma Development of Crocus sativus and Its Closer Relatives1
- Accumulation of Carotenoids and Expression of Carotenoid Biosynthetic Genes during Maturation in Citrus Fruit1
- Identification of the Clostridium perfringens Genes Involved in the Adaptive Response to Oxidative Stress
- Plant carotenoids: pigments for photoprotection, visual attraction, and human health.