l-Ascorbic Acid Biosynthesis in Higher Plants from l-Gulono-1, 4-lactone and l-Galactono-1, 4-lactone
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چکیده
منابع مشابه
L-ascorbic acid biosynthesis in higher plants from L-gulono-1, 4-lactone and L-galactono-1, 4-lactone.
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...
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...
متن کاملThe contribution of Arabidopsis homologs of L-gulono-1,4-lactone oxidase to the biosynthesis of ascorbic acid.
To clarify the involvement of seven Arabidopsis homologs of rat L-gulono-1,4-lactone (L-GulL) oxidase, AtGulLOs, in the biosynthesis of L-ascorbic acid (AsA), transgenic tobacco cells overexpressing the various AtGulLOs were generated. Under treatment with L-GulL, the levels of total AsA in three transgenic tobacco cell lines, overexpressing AtGulLO2, 3, or 5, were significantly increased as co...
متن کاملAscorbic 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 کاملConversion of L-galactono-1,4-lactone to L-ascorbate is regulated by the photosynthetic electron transport chain in Arabidopsis.
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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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1970
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.46.2.277