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Publication Type J
Authors Duhaze, C., D. Gagneul, L. Leport, F. R. Larher and A. Bouchereau
Title Uracil as one of the multiple sources of beta-alanine in Limonium latifolium, a halotolerant beta-alanine betaine accumulating Plumbaginaceae
Source Plant Physiology and Biochemistry
Abstract The metabolic origin of beta-alanine has been assessed in Limonium latifolium, a halotolerant Plumbaginaceae, which accumulates beta-alanine betaine as an osmoprotectant. It was already known that beta-alanine may act as a substrate for beta-alanine betaine synthesis in this species and that propionate and spermidine metabolism may serve as putative ways for beta-alanine production. The present study reveals that feeding experiments with substrates suspected to be converted to beta-alanine bring about preliminary evidences about the multiplicity of the biosynthetic routes leading to this amino acid in L. latifolium. beta-Alanine level is shown to be enhanced in roots from hydroponically grown seedlings fed with 1,3-diaminopropane, propionate or N-carbamyl beta-alanine. Such precursor-product relationships were only observed in roots. Radiotracer experiments with [5,6-H-3]-uracil supplied to seedlings of L. latifolium and L. sinuatum, a beta-alanine betaine non-accumulating species, demonstrate the effectiveness of uracil degradative pathway in beta-alanine synthesis via dihydrouracil and N-carbamyl beta-alanine in both species. It is demonstrated that this pathway is actually extended to beta-alanine betaine only in the betaine accumulating species. The present results suggest that multiple ways deriving from aliphatic polyamines, propionate or uracil may cooperate for beta-alanine and beta-alanine betaine production in L. latifolium, the contribution of pyrimidine catabolism being highlighted for the first time. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
Publication Date Nov-Dec
Year Published 2003
Volume 41
Issue 11-12
Beginning Page 993-998
Digital Object Identifier (DOI) 10.1016/j.plaphy.2003.06.002
Unique Article Identifier WOS:000186816700008
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