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Type: Artigo de periódico
Title: Nitrogen compounds in the xylem sap of coffee
Author: Mazzafera, P
Goncalves, KV
Abstract: Some N containing compounds were analyzed and identified in the xylem sap collected from coffee seedlings. In order to facilitate sap bleeding, the seedlings were kept in a humidified chamber. Asparagine was the major amino acid present, representing 30.5% (257 mu g N ml(-1) sap) of the total nitrogen detected, while glutamine represented 6.9% (58 mu g N ml(-1) sap). Overall, amino acids accounted for 41.2% (347 mu g N ml(-1) sap) of the total sap nitrogen, whereas NO3 was the most abundant N compound (51.9%, 437 mu g N ml(-1) sap). Caffeine (1.2%, 10.5 mu g N ml(-1) sap), and the ureides alantoin (4.2%, 35.6 mu g N ml(-1) sap) and allantoic acid (1.4%, 11.9 mu g N ml(-1) sap) were also detected in the xylem exudate. (C) 1998 Elsevier Science Ltd. All rights reserved.
Subject: allantoic acid
amino acids
Coffea arabica
nitrogen transport
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/S0031-9422(98)00582-2
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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