Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/77143
Type: Artigo de periódico
Title: Allantoin has a limited role as nitrogen source in cultured coffee cells
Author: Filippi, SB
Azevedo, RA
Sodek, L
Mazzafera, P
Abstract: In plants the ureides allantoin (ALN) and allantoic acid (ALA) are formed in purine metabolism, and in some legumes both compounds play an important role as nitrogen (N) sources. In coffee plants, ALN and ALA are catabolites of caffeine degradation. Caffeine is found throughout the coffee plant and in some parts this alkaloid can accumulate up to 4% dry basis. Therefore, caffeine degradation via ureides may make an important contribution to N metabolism of the plant. Using coffee cell suspension as a model we investigated the contribution of ALN as a source of N in coffee. ALN was incorporated in the liquid medium and after 20 d of cultivation, cell mass, NO3, NH4, amino acids, soluble proteins, ALN and caffeine were determined in the cells. The activity of glutamine synthetase was also studied. The results showed that despite being taken up by cells ALN does not contribute significantly as a source of N in coffee cells. Compared with mineral N sources, cells grown with ALN-N accumulated much less mass. The inclusion of ALN in the medium caused significant alterations in the content of some N compounds indicating a stress condition. (C) 2006 Elsevier GmbH. All rights reserved.
Subject: caffeine
Coffea arabica
glutamine synthetase
nitrogen
ureides
Country: Alemanha
Editor: Elsevier Gmbh, Urban & Fischer Verlag
Rights: fechado
Identifier DOI: 10.1016/j.jplph.2006.03.005
Date Issue: 2007
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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