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Título: | Nicotianamine synthase 2 Is required for symbiotic Nitrogen fixation in Medicago truncatula nodules |
Autor: | Escudero, Viviana; Abreu, Isidro; Sastre, Eric del; Tejada-Jiménez, Manuel; Larue, Camille; Novoa-Aponte, Lorena; Castillo-González, Jorge CSIC; Wen, Jiangqi; Mysore, Kirankumar S.; Abadía Bayona, Javier CSIC ORCID ; Argüello, José M.; Castillo-Michel, Hiram; Álvarez-Fernández, Ana CSIC ORCID ; Imperial, Juan CSIC ORCID ; González-Guerrero, Manuel CSIC ORCID | Fecha de publicación: | ene-2020 | Editor: | Frontiers Media | Citación: | Escudero V... [et al.]. Nicotianamine synthase 2 Is required for symbiotic Nitrogen fixation in Medicago truncatula nodules. Frontiers in Plant Science 10: 1780 (2020) | Resumen: | Symbiotic nitrogen fixation carried out by the interaction between legumes and diazotrophic bacteria known as rhizobia requires relatively large levels of transition metals. These elements are cofactors of many key enzymes involved in this process. Metallic micronutrients are obtained from soil by the roots and directed to sink organs by the vasculature, in a process mediated by a number of metal transporters and small organic molecules that facilitate metal delivery in the plant fluids. Among the later, nicotianamine is one of the most important. Synthesized by nicotianamine synthases (NAS), this molecule forms metal complexes participating in intracellular metal homeostasis and long-distance metal trafficking. Here we characterized the NAS2 gene from model legume Medicago truncatula. MtNAS2 is located in the root vasculature and in all nodule tissues in the infection and fixation zones. Symbiotic nitrogen fixation requires of MtNAS2 function, as indicated by the loss of nitrogenase activity in the insertional mutant nas2-1, phenotype reverted by reintroduction of a wild-type copy of MtNAS2. This would result from the altered iron distribution in nas2-1 nodules shown with X-ray fluorescence. Moreover, iron speciation is also affected in these nodules. These data suggest a role of nicotianamine in iron delivery for symbiotic nitrogen fixation. | Descripción: | 14 Pags.- 6 Figs.- 1 Tabl. Copyright © 2020 The Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. | Versión del editor: | https://doi.org/10.3389/fpls.2019.01780 | URI: | http://hdl.handle.net/10261/203145 | DOI: | 10.3389/fpls.2019.01780 | E-ISSN: | 1664-462X |
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