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Descripción
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| Symbiotic nitrogen fixation requires a relatively large amount of transition metals (iron, copper, zinc, molybdenum,?), as cofactors of some of the key enzymes involved in this process. For instance, nitrogenase uses iron and molybdenum to fix nitrogen in an microaerobic environment created by the iron-protein leghemoglobin, using the energy provided in an electron-transport chain involving iron-copper cytochrome oxidases. Consequently, symbiotic nitrogen fixation is severely influenced by the host plant ability to uptake these metallic oligonutrients from soil and deliver them to the endosymbiotic rhizobia within the nodule cells. Using synchrotron-based X-ray fluorescence, our group has mapped transition metal distribution in Medicago truncatula nodules to determine how these elements are delivered. This information has allowed us to identify a set of transporters mediating metal translocation into rhizobia-infected cells, and their delivery to symbiosomes. Expression levels of some of these transporters correlate with legume adaptation to soils with low iron availability. | |
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Internacional
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Si |
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ISSN o ISBN
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0000000000 |
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Entidad relacionada
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Nacionalidad Entidad
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Sin nacionalidad |
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Lugar del congreso
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