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    Insights into the regulation of nitrogen fixation in pea nodules: lessons from drought, abscisic acid and increased photoassimilate availability

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    Gonzalez_InsightsRegulation.pdf (244.1Kb)
    Date
    2001
    Author
    González García, Esther Upna
    Gálvez, Loli 
    Royuela Hernando, Mercedes Upna
    Aparicio Tejo, Pedro María Upna
    Arrese-Igor Sánchez, César Upna
    Version
    Acceso abierto / Sarbide irekia
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    Artículo / Artikulua
    Version
    Versión publicada / Argitaratu den bertsioa
    Impact
     
     
     
    10.1051/agro:2001151
     
     
     
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    Abstract
    Nitrogen fixation in legume nodules has been shown to be very sensitive to drought and other environmental constraints. It has been widely assumed that this decline in nitrogen fixation was a consequence of an increase in the so-called oxygen diffusion barrier and a subsequent impairment to bacteroid respiration. However, it has been recently shown that nitrogen fixation is highly correlated with ... [++]
    Nitrogen fixation in legume nodules has been shown to be very sensitive to drought and other environmental constraints. It has been widely assumed that this decline in nitrogen fixation was a consequence of an increase in the so-called oxygen diffusion barrier and a subsequent impairment to bacteroid respiration. However, it has been recently shown that nitrogen fixation is highly correlated with nodule sucrose synthase (SS) activity under drought and other environmental stresses. Whether this correlation reflects a causative relationship or not has not been proven yet. The evidence presented here suggests that SS controls nitrogen fixation under mild drought conditions. However, nitrogen fixation cannot be enhanced only by increasing glycolytic flux, as under these conditions nodules become oxygen limited. Abscisic acid also induces a decline in nitrogen fixation that is independent of SS. The overall results suggest the occurrence of a complex regulation of nodule nitrogen fixation involving, at least, both carbohydrate and oxygen fluxes within the nodule. [--]
    Subject
    Glycolytic flux, Nitrogen, Nodules, Metabolism regulation
     
    Publisher
    EDP Sciences
    Published in
    Agronomie 21 (2001) 607–6138
    Departament
    Universidad Pública de Navarra. Departamento de Ciencias del Medio Natural / Nafarroako Unibertsitate Publikoa. Natura Ingurunearen Zientziak Saila
     
    Publisher version
    https://doi.org/10.1051/agro:2001151
    URI
    https://hdl.handle.net/2454/36231
    Sponsorship
    Loli Gálvez was the holder of a grant from the Spanish Ministry of Education (Plan F.P.U.). This work was supported by DGESIC (PB98-0545).
    Appears in Collections
    • Artículos de revista DCMN - NIZS Aldizkari artikuluak [85]
    • Artículos de revista - Aldizkari artikuluak [2947]
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