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Ascorbate as a biosynthetic precursor in plants.

Seth Debolt1, Vanessa Melino, Christopher M Ford

  • 1School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, PMB1, Glen Osmond, SA 5064, Australia.

Annals of Botany
|November 14, 2006
PubMed
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l-Ascorbate (vitamin C) is a precursor for organic acid biosynthesis in plants. Recent research reveals its significant role in plant metabolism beyond its antioxidant functions.

Area of Science:

  • Plant biochemistry
  • Plant metabolism
  • Organic acid biosynthesis

Background:

  • l-Ascorbate (vitamin C) is crucial for redox control and antioxidant activity in plants.
  • Emerging research highlights its role as a precursor in organic acid biosynthesis.

Purpose of the Study:

  • To summarize recent advances in l-ascorbate metabolism.
  • To detail its function as a biosynthetic precursor for specific organic acids.
  • To review mechanisms of organic acid formation and potential dual roles of l-ascorbate.

Main Methods:

  • Review of recent advances in l-ascorbate metabolism (biosynthesis, translocation, function).
  • Description of l-ascorbate's role in oxalic, l-threonic, and l-tartaric acid formation.
  • Elaboration of mechanisms for organic acid synthesis.

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Main Results:

  • l-Ascorbate serves as a biosynthetic precursor for oxalic, l-threonic, and l-tartaric acids.
  • Mechanisms of formation for these organic acids have been investigated.
  • The dual roles of l-ascorbate (functional and biosynthetic) present potential conflicts.

Conclusions:

  • Recent findings strongly support a major role for l-ascorbate in plant metabolism.
  • Understanding of l-ascorbate catabolism and organic acid formation has advanced.
  • Integrated biochemical and 'omics' approaches provide new insights.