Journal Article

Short- and Long-Term Effects of Dehydroascorbate in <i>Lupinus albus</i> and <i>Allium cepa</i> Roots

Costantino Paciolla, Mario C. De Tullio, Adriana Chiappetta, Anna Maria Innocenti, Maria Beatrice Bitonti, Rosalia Liso and Oreste Arrigoni

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 8, pages 857-863
Published in print August 2001 | ISSN: 0032-0781
Published online August 2001 | e-ISSN: 1471-9053 | DOI:
Short- and Long-Term Effects of Dehydroascorbate in Lupinus albus and Allium cepa Roots

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry


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Administration of 1 mM dehydroascorbate (DHA) results in a rapid and large increase in cellular ascorbate (AA) content in both Lupinus albus L. and Allium cepa L. root tips. Uptake of DHA from the medium occurs at a high rate within 10–12 h of incubation, and is slowed down thereafter. In the first few h, DHA reduction to AA is apparently correlated to GSH depletion and slightly higher DHA reductase activity. DHA incubation also seems to induce new GSH synthesis. Longer DHA incubation (24 h) affects root growth by inhibiting cell proliferation. At this stage, an apparently generalised oxidation of SH-containing proteins is observed in DHA-treated roots. Treatment with 1 mM l-galactono-γ-lactone, the last precursor of AA biosynthesis, results in an increase in AA content similar to that obtained with DHA, but stimulates growth and affects the redox state of SH-containing proteins in the opposite way. A possible multi-step mechanism of DHA reduction/removal is suggested and the hypothesis that DHA inhibits cell cycle progression by affecting the redox state of SH-containing proteins is discussed.

Keywords: Key words: Allium cepa L. — Ascorbate — Cell cycle progression — Dehydroascorbate — Lupinus albus L. — Root growth.; Abbreviations: AA, ascorbate; BSO, l-buthionine-s,r-sulfoximine; DHA, dehydroascorbate; GL, l-galactono-γ-lactone; mBBr, monobromobimane.

Journal Article.  4798 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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