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|Type:||Artigo de periódico|
|Title:||Nitrogen compounds in the xylem sap of coffee|
|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.|
|Editor:||Pergamon-elsevier Science Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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