Carotenoid metabolism and the biosynthesis of abscisic acid
| Autor: | Andrew D. Parry, Roger Horgan |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
chemistry.chemical_classification
biology Stereochemistry food and beverages Plant Science General Medicine Metabolism Horticulture biology.organism_classification Biochemistry Lycopersicon Lipoxygenase chemistry.chemical_compound Enzyme Neoxanthin chemistry Biosynthesis biology.protein Molecular Biology Abscisic acid Violaxanthin |
| Zdroj: | Phytochemistry. 30:815-821 |
| ISSN: | 0031-9422 |
| DOI: | 10.1016/0031-9422(91)85258-2 |
| Popis: | The conversion of all-trans-violaxanthin to 9′-cis-neoxanthin was shown to occur in fluridone-treated etiolated Lycopersicon and Phaseolus seedlings, following exposure to light. The results of deuterium oxide labelling experiments supported this precursor/product relationship, and provided further evidence for the origin of abscisic acid. Several apo-carotenoids, putative by-products of abscisic acid biosynthesis, were synthesised by chemical oxidation but were not detected in plant extracts. In vitro, lipoxygenase cleaved neoxanthin and violaxanthin down to small ( \ C13) fragments. It may be that in vivo any apo-carotenoids formed by the specific cleavage of 9′-cis-neoxanthin, during abscisic acid biosynthesis, are rapidly metabolized by lipoxygenase or similar enzymes. |
| Databáze: | OpenAIRE |
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