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A new perspective on the effect of UV-B on L-ascorbic acid metabolism in cucumber seedlings.

08:00 EDT 2nd April 2019 | BioPortfolio

Summary of "A new perspective on the effect of UV-B on L-ascorbic acid metabolism in cucumber seedlings."

This study aimed to examine the effects of UV-B on AsA and gene expression in cucumber seedlings. Particular emphasis was placed on identifying genes that were responsive to UV-B to increase AsA levels and elucidate the key UV-B response pathway. We found that the activities of myo-inositol oxygenase (MIOX), galactono-1,4-lactone dehydrogenase (GLDH), ascorbate oxidase (AO), ascorbate peroxidase (APX), glutathione reductase (GR), dehydroascorbate reductase (DHAR), and the transcript levels of CsMIOX1, CsGLDH, CsAO2, CsAO4, CsGR1, CsAPX5, CsDHAR1 significantly increased with UV-B exposure. These observations indicate that UV-B induces the expression of genes involved in D-mannose/L-galactose, myo-inositol pathway and the ascorbate-glutathione system. Moreover, several genes related to the low and high UV-B fluence responses were considered. CsHY5 and CsMYB60 were involved with the low fluence response and appeared to be responsive from 2 h to 28 h. Together, these data show that these genes respond to UV-B to increase AsA levels through the low fluence UV-B response pathway.

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This article was published in the following journal.

Name: Journal of agricultural and food chemistry
ISSN: 1520-5118
Pages:

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A strong dicarboxylic acid occurring in many plants and vegetables. It is produced in the body by metabolism of glyoxylic acid or ascorbic acid. It is not metabolized but excreted in the urine. It is used as an analytical reagent and general reducing agent.

A condition due to a dietary deficiency of ascorbic acid (vitamin C), characterized by malaise, lethargy, and weakness. As the disease progresses, joints, muscles, and subcutaneous tissues may become the sites of hemorrhage. Ascorbic acid deficiency frequently develops into SCURVY in young children fed unsupplemented cow's milk exclusively during their first year. It develops also commonly in chronic alcoholism. (Cecil Textbook of Medicine, 19th ed, p1177)

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