Variation in the ureide content of Jack Bean during the reproductive stages in response to nitrate

Variation in the ureide content of Jack Bean during the reproductive stages in response to nitrate

Nitrogen is frequently the limiting mineral nutrient for plant productivity and it is essential to obtain an understanding of how this element is assimilated and its metabolism regulated, in crop plants. The objective of this work was to study nitrogen metabolism in the tropical legume Canavalia ens...

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Bibliographic Details
Main Authors: Liliane Santos Camargos, Leandro Ferreira Aguiar, José Antônio Carmezini, Ricardo Antunes Azevedo
Format: Article
Language:English
Published: Instituto de Tecnologia do Paraná (Tecpar) 2009-06-01
Series:Brazilian Archives of Biology and Technology
Subjects:
Nitrogen metabolism
allantoin
allantoic acid
Canavalia ensiformis
ureides
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300009
Description
Summary:Nitrogen is frequently the limiting mineral nutrient for plant productivity and it is essential to obtain an understanding of how this element is assimilated and its metabolism regulated, in crop plants. The objective of this work was to study nitrogen metabolism in the tropical legume Canavalia ensiformis, a plant species used as a green manure. The nitrate dose provided changed the concentrations of ureides exported via the xylem, whilst the developmental stage alterations demonstrated to influence the form of ureide exported via the xylem. Considering the content of ureides as an indicator of N-fixation status, it could be concluded that N-fixation was affected in the presence of nitrate in C. ensiformis.<br>Nitrogênio é o nutriente mineral mais limitante e importante para produção vegetal e o entendimento de como esse elemento é assimilado e como seu metabolismo é regulado, são essenciais para plantas cultivadas. O objetivo deste trabalho foi estudar as variações no metabolismo de nitrogênio em Canavalia ensiformis, em resposta ao nitrato, durante o período reprodutivo. A dose de nitrato fornecida mudou as concentrações de udeídeos exportados via xilema, enquanto alterações no estádio de desenvolvimento mostrou influenciar a forma de ureídeo exportado via xilema. Considerando o nível de ureídeos como um indicador do status da fixação biológica, é possível dizer que a fixação do nitrogênio pode ter sido afetada na presença do nitrato em C. ensiformis.
ISSN:1516-8913
1678-4324

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