Ascorbic Acid Metabolism in Pea Seedlings. A Comparison ofd-Glucosone, l-Sorbosone, andl-Galactono-1,4-Lactone as Ascorbate Precursors1
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منابع مشابه
Ascorbic acid metabolism in pea seedlings. A comparison of D-glucosone, L-sorbosone, and L-galactono-1,4-lactone as ascorbate precursors
L-Ascorbic acid (AsA) accumulates in pea (Pisum sativum L.) seedlings during germination, with the most rapid phase of accumulation coinciding with radicle emergence. Monodehydroascorbate reductase and dehydroascorbic acid reductase were active in the embryonic axes before AsA accumulation started, whereas AsA oxidase and AsA peroxidase activities increased in parallel with AsA. Excised embryon...
متن کاملBiological Synthesis of Ascorbic Acid: L-Galactono-y-lactone Dehydrogenase
Dodgson, K. S., Spencer, B. & Wynn, C. H. (1956b). Biochem. J. 62, 500. Hammond, B. R. & Gutfreund, H. (1955). Biochem. J. 61, 187. Laidler, K. J. (1955a). Tran8. Faraday Soc. 51, 528. Laidler, K. J. (1955b). Tran8. Faraday Soc. 51, 540. Lineweaver, H. & Burk, D. (1934). J. Amer. chem. Soc. 56, 658. Lowry, 0. H., Rosebrough, N. J., Farr, A. L. & Randall, R. J. (1951). J. biol. Chem. 193, 265. M...
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Detached bean (Phaseolus vulgaris) and strawberry (Fragaria) fruits fed l-gulono-1,4-lactone or l-galactono-1,4-lactone convert this compound, in part, to l-ascorbic acid. When l-galactono-1,4-lactone is given as a 0.25% solution to detached bean shoots, the ascorbic acid content is tripled in less than 10 hours. l-Gulono-1,4-lactone is only 5 to 10% as effective as its epimer. Experiments with...
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In this study we focused on the effects of light irradiation and the addition of L-galactono-1,4-lactone (L-GalL) on the conversion of exogenous L-GalL to L-ascorbate (AsA) and the total AsA pool size in detached leaves of Arabidopsis plants and transgenic plants expressing the rat L-gulono-1,4-lactone oxidase gene. Increases in the total AsA level in L-GalL-treated leaves depended entirely on ...
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The biosynthesis of i-ascorbic acid (vitamin C) is not well understood in plants. The ozone-sensitive Arabidopsis thaliana mutant vifamin cl (vfcl; formerly known as sozl) is deficient in ascorbic acid, accumulating approximately 30% of wild-type levels. This deficiency could result from elevated catabolism or decreased biosynthesis. No differences that could account for the deficiency were fou...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1999
ISSN: 1532-2548,0032-0889
DOI: 10.1104/pp.120.2.453