Ascorbate function and associated transport systems in plants

Ascorbate is present in different cell compartments of higher plant cells. At a physiological level, the best-studied phenomena involving ascorbate is its participation in an oxygen scavenging pathway in the chloroplast known as the ascorbate-glutathione cycle. In addition, evidence is emerging that...

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Bibliographic Details
Published in:Plant physiology and biochemistry 2000-07, Vol.38 (7), p.531-540
Main Authors: Horemans, Nele, H. Foyer, Christine, Potters, Geert, Asard, Han
Format: Article
Language:English
Subjects:
ACIDE ASCORBIQUE
ACIDO ASCORBICO
antioxidant
ascorbate
ASCORBIC ACID
Biological and medical sciences
chloroplast membrane
dehydroascorbate
Fundamental and applied biological sciences. Psychology
METABOLISM
Metabolism. Physicochemical requirements
METABOLISME
METABOLISMO
NUTRIENT TRANSPORT
ORGANIC ACID SALTS
Plant physiology and development
PLANTAS
PLANTE
PLANTS
plasma membrane
SALES DE ACIDOS ORGANICOS
SEL D'ACIDE ORGANIQUE
transport
TRANSPORT DES SUBSTANCES NUTRITIVES
TRANSPORTE DE NUTRIENTES
vitamin C
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Summary:Ascorbate is present in different cell compartments of higher plant cells. At a physiological level, the best-studied phenomena involving ascorbate is its participation in an oxygen scavenging pathway in the chloroplast known as the ascorbate-glutathione cycle. In addition, evidence is emerging that ascorbate fulfils essential roles in growth, development and defence outside the chloroplast. Despite its importance in plant biology, the pathway of ascorbate biosynthesis has only recently been elucidated. From the site of synthesis in the mitochondria, ascorbate must be transported to other cellular compartments where it accumulates to high concentrations. Translocation of ascorbate through the plasmalemma and chloroplast membrane is mediated by specific carriers. Initial observations indicate that carriers for both ascorbate and its oxidised form dehydroascorbate are present in plant membranes. Regulation of ascorbate transport systems may be central in the regulation of different physiological processes including progression through the cell cycle, expansion of the cell wall and defence against abiotic and biotic threats.
ISSN:0981-9428
1873-2690
DOI:10.1016/S0981-9428(00)00782-8