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Nitrogen nutrition and the accumulation of free and sinapoyl bound malic acid in raphanus sativus var sativus cotyledons


Nitrogen nutrition and the accumulation of free and sinapoyl bound malic acid in raphanus sativus var sativus cotyledons



Planta (Heidelberg) 161(2): 142-147



ISSN/ISBN: 0032-0935

Seedlings of red radish accumulated high amounts of free malic acid and sinapylmalate, when grown on NO3- as the sole N-source. In the presence of ammonium (NO3-: NH4+, 1:2) 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 channeling 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.

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Accession: 005987037

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Nitrogen nutrition and the accumulation of free and sinapoyl-bound malic acid in Raphanus sativus cotyledons. Planta 161(2): 142-147, 1984

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