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dc.contributor.authordo Amarante, Luciano
dc.contributor.authorLima, Juliana Domingues [UNESP]
dc.contributor.authorSodek, Ladaslav
dc.identifier.citationActa Physiologiae Plantarum, v. 44, n. 1, 2022.
dc.description.abstractThe dynamics of changes in key metabolites of N metabolism were investigated simultaneously in roots, nodules and xylem sap following treatments that turn on and off symbiotic N2 fixation in the nodules and nitrate assimilation in the roots. Substantial changes in xylem ureides, glutamine and asparagine are known to mark the functioning of these two processes of N assimilation. The objective was to evaluate whether similar changes in these metabolites occur in the source organs, roots and nodules, as well as the timing of these events. The clearest relationship was found for asparagine, the main product of nitrate assimilation in the root exported in the xylem, where in the presence of nitrate, substantial increases took place in both the xylem and root. The markers of N2 fixation, ureides and glutamine, showed a much less expressive change (ureides) or no significant change (glutamine) in the nodules compared to the substantial change recorded in the xylem. The highly contrasting level of asparagine in the nodule in response to N2 fixation activity has potential as a diagnostic tool for activity of this assimilatory process. The timing of changes in the source organs coincided with that of the xylem. Activities of glutamine synthetase, glutamine oxoglutarate amino transferase and asparagine synthetase in roots and nodules varied according to the treatment, consistent with changes in assimilatory activity. A short period of N starvation accelerated nitrate uptake and assimilation in the roots when nitrate became available. The evidence did not support nitrate assimilation in nodules.en
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.relation.ispartofActa Physiologiae Plantarum
dc.subjectN metabolism
dc.subjectSoybean (Glycine max L.)
dc.subjectXylem sap
dc.titleAlterations of xylem transport of key metabolic products of assimilatory activity in soybean: do similar alterations occur in roots and nodules?en
dc.contributor.institutionUniversidade Federal de Pernambuco (UFPE)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.description.affiliationCenter for Chemical Pharmaceutical and Food Sciences-CCQFA Federal University of Pelotas-UFPel
dc.description.affiliationSão Paulo State University (UNESP)
dc.description.affiliationDepartment of Plant Biology Institute of Biology University of Campinas-UNICAMP, P.O. Box 6109
dc.description.affiliationUnespSão Paulo State University (UNESP)
dc.description.sponsorshipIdCNPq: 305916/2014-9
dc.description.sponsorshipIdFAPESP: 98/02834-4
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