Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/59113
Type: Artigo de periódico
Title: PARTITIONING OF NITROGEN IN SOYBEAN FRUIT EXPLANTS CULTURED WITH GLUTAMINE, ASPARAGINE OR ALLANTOIN
Author: MOSQUIM, PR
SODEK, L
Abstract: Explants of immature soybean (Glycine max) fruits were cultured with different N sources (glutamine, asparagine and allantoin) and the distribution of N determined in the different parts of the explant. All three sources of N were equally efficient for protein accumulation in the cotyledons. This gain in N was not the result of mobilization of N from other parts of the explant. Mobilization did occur in the N-free control, where the ureide fractions were preferentially mobilized from the stem and pod-wall. Allantoin promoted an increase in protein of the stem sections, similar to the amides, while allantoin was more efficient than the amides in retarding N mobilization from the pod-walls. It is suggested that ureides are metabolized in stems and pod-walls. The amino acid composition of the soluble N pool showed highly characteristic patterns for the different explant tissues, independent of the N source. The metabolic adjustments made in different parts of the soybean fruit explant in response to the N source used, appear to be efficient in maintaining an adequate supply of amino acids for reserve protein synthesis in the developing seeds.
Subject: PROTEIN ACCUMULATION
FREE AMINO ACID COMPOSITION
GLYCINE-MAX
Country: França
Editor: Gauthier-villars
Rights: fechado
Date Issue: 1992
Appears in Collections:Unicamp - Artigos e Outros Documentos

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