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Plant Physiol, October 1999, Vol. 121, pp. 535-544

Ascorbate Biosynthesis in Arabidopsis Cell Suspension Culture

Mark W. Davey,* Christophe Gilot, Geert Persiau, Jens Østergaard, Yu Han, Guy C. Bauw, and Marc C. Van Montagu

Laboratorium voor Genetica, Departement Plantengenetica, Vlaams Interuniversitair Instituut voor Biotechnologie, Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium

The biosynthesis of L-ascorbic acid (L-AA) in an Arabidopsis (L.) Heynh. cell suspension culture was studied by quantifying the effects of incubation with a range of potential biosynthetic precursors, analogs, and inhibitors on the intracellular levels of reduced and oxidized forms of L-AA. Our results support the recently published biosynthetic pathway of L-AA from L-galactose (G.L. Wheeler, M.A. Jones, N. Smirnoff [1998] Nature 393: 365-369), but suggest that Arabidopsis cell suspension culture simultaneously contains two other routes leading to L-AA. The possible physiological significance of these alternate routes is discussed.

* Corresponding author; e-mail madav{at}gengenp.rug.ac.be; fax 32-9-2645349.

© 1999 American Society of Plant Physiologists


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