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Biochemical and molecular analysis of carotenoid biosynthesis in flavedo of orange (Citrus sinensis L.) during fruit development and maturation

Identifieur interne : 002A16 ( Main/Exploration ); précédent : 002A15; suivant : 002A17

Biochemical and molecular analysis of carotenoid biosynthesis in flavedo of orange (Citrus sinensis L.) during fruit development and maturation

Auteurs : Maria-Jesus Rodrigo [Espagne] ; Jose F. Marcos [Espagne] ; Lorenzo Zacarias [Espagne]

Source :

Journal of agricultural and food chemistry : (Print) [ 0021-8561 ] ; 2004.

RBID : Pascal:05-0140601

Descripteurs français

Pascal (Inist)
- Analyse biochimique, Caroténoïde, Biosynthèse, Orange, Citrus sinensis, Fruit, Développement, Agrume, Expression génique.
Wicri :
- topic : Fruit, Agrume.

English descriptors

KwdEn :
- Biochemical analysis, Biosynthesis, Carotenoid, Carotenoids (biosynthesis), Carotenoids (genetics), Chlorophyll (analysis), Citrus fruit, Citrus sinensis, Citrus sinensis (growth & development), Citrus sinensis (metabolism), Development, Fruit, Fruit (growth & development), Fruit (metabolism), Gene Expression, Gene expression, Orange, RNA, Messenger (analysis).
MESH :
- chemical , analysis : Chlorophyll, RNA, Messenger.
- chemical , biosynthesis : Carotenoids.
- chemical , genetics : Carotenoids.
- growth & development : Citrus sinensis, Fruit.
- metabolism : Citrus sinensis, Fruit.
- Gene Expression.

Abstract

Changes in carotenoid content and composition and expression of carotenoid biosynthetic genes were analyzed in the flavedo of sweet orange (Citrus sinensis L. Osbeck, cv. Navelate) fruit during development and maturation. Lutein and all-E-violaxanthin were the major carotenoids in chloroplast-containing tissues. During fruit coloration, phytoene, β-cryptoxanthin, zeaxanthin, and mainly (9Z)-violaxanthin progressively accumulated, and a large proportion of apocarotenoids was also found in the flavedo of full-colored fruits. We have cloned partial and full-length cDNAs corresponding to genes involved in early condensation and desaturase reactions [phytoene synthase (PSY), phytoene desaturase (PDS), and ζ-carotene desaturase (ZDS)], coupled redox reaction (plastid terminal oxidase), cyclizations [β-lycopene cyclase (β-LCY) and ∈-lycopene cyclase (∈-LCY)], hydroxylation [β-carotene hydroxylase (β-CHX)], and epoxidation [zeaxanthin epoxidase (ZEP)] and analyzed their mRNA accumulation in the flavedo of fruits during development and ripening as compared with those of leaves. Collectively, the results indicated that PDS gene expression correlated with carotenoid content in developing fruit and that up-regulation of PSY and ZDS genes at the onset of fruit coloration would enhance the production of linear carotenes and the flux into the pathway. The shift from the β,∈-branch to the β,β-branch of the pathway that originates the changes in carotenoid composition during fruit coloration may be explained by a down-regulation of ∈-LCY and by the increase of the β-CHX transcript.

Affiliations:

Espagne

Le document en format XML

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<front><div type="abstract" xml:lang="en">Changes in carotenoid content and composition and expression of carotenoid biosynthetic genes were analyzed in the flavedo of sweet orange (Citrus sinensis L. Osbeck, cv. Navelate) fruit during development and maturation. Lutein and all-E-violaxanthin were the major carotenoids in chloroplast-containing tissues. During fruit coloration, phytoene, β-cryptoxanthin, zeaxanthin, and mainly (9Z)-violaxanthin progressively accumulated, and a large proportion of apocarotenoids was also found in the flavedo of full-colored fruits. We have cloned partial and full-length cDNAs corresponding to genes involved in early condensation and desaturase reactions [phytoene synthase (PSY), phytoene desaturase (PDS), and ζ-carotene desaturase (ZDS)], coupled redox reaction (plastid terminal oxidase), cyclizations [β-lycopene cyclase (β-LCY) and ∈-lycopene cyclase (∈-LCY)], hydroxylation [β-carotene hydroxylase (β-CHX)], and epoxidation [zeaxanthin epoxidase (ZEP)] and analyzed their mRNA accumulation in the flavedo of fruits during development and ripening as compared with those of leaves. Collectively, the results indicated that PDS gene expression correlated with carotenoid content in developing fruit and that up-regulation of PSY and ZDS genes at the onset of fruit coloration would enhance the production of linear carotenes and the flux into the pathway. The shift from the β,∈-branch to the β,β-branch of the pathway that originates the changes in carotenoid composition during fruit coloration may be explained by a down-regulation of ∈-LCY and by the increase of the β-CHX transcript.</div>
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<tree><country name="Espagne"><noRegion><name sortKey="Rodrigo, Maria Jesus" sort="Rodrigo, Maria Jesus" uniqKey="Rodrigo M" first="Maria-Jesus" last="Rodrigo">Maria-Jesus Rodrigo</name>
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<name sortKey="Marcos, Jose F" sort="Marcos, Jose F" uniqKey="Marcos J" first="Jose F." last="Marcos">Jose F. Marcos</name>
<name sortKey="Zacarias, Lorenzo" sort="Zacarias, Lorenzo" uniqKey="Zacarias L" first="Lorenzo" last="Zacarias">Lorenzo Zacarias</name>
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Biochemical and molecular analysis of carotenoid biosynthesis in flavedo of orange (Citrus sinensis L.) during fruit development and maturation

Biochemical and molecular analysis of carotenoid biosynthesis in flavedo of orange (Citrus sinensis L.) during fruit development and maturation

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

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