Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Nitrogen nutrition and the accumulation of free and sinapoyl-bound malic acid in Raphanus sativus cotyledons

Brigitte Dahlbender and Dieter Strack
Planta
Vol. 161, No. 2 (1984), pp. 142-147
Published by: Springer
Stable URL: http://www.jstor.org/stable/23377170
Page Count: 6
  • More info
  • Cite this Item
Nitrogen nutrition and the accumulation of free and sinapoyl-bound malic acid in Raphanus sativus cotyledons
Preview not available

Abstract

Seedlings of red radish (Raphanus sativus L. var. sativus) accumulated high amounts of free malic acid and sinapoylmalate, when grown on nitrate as the sole N-source. In the presence of ammonium ($\mathrm{N}{\mathrm{O}}_{3}^{-}:\mathrm{N}{\mathrm{H}}_{4}^{+},$) both metabolites failed to accumulate, and the levels of arginine, asparagine, glutamine, histidine, and serine were greatly increased. The extractable activity of 1-sinapoylglucose: L-malate sinapoyltransferase, an enzyme which plays a key role in channelling malic acid into the sinapic-acid metabolism of this plant, was positively correlated with the malic-acid level in cotyledons. The possibility is discussed that free malic acid might be the likely candidate for regulating the activity of 1-sinapoylglucose: L-malate sinapoyltransferase.

Page Thumbnails

  • Thumbnail: Page 
[142]
    [142]
  • Thumbnail: Page 
143
    143
  • Thumbnail: Page 
144
    144
  • Thumbnail: Page 
145
    145
  • Thumbnail: Page 
146
    146
  • Thumbnail: Page 
147
    147