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dc.contributor.authorRellán-Álvarez, Rubén-
dc.contributor.authorGiner-Martínez-Sierra, Justo-
dc.contributor.authorOrduna, Jesús-
dc.contributor.authorOrera Utrilla, Irene-
dc.contributor.authorRodríguez-Castrillón, José Ángel-
dc.identifier.citationPlant and Cell Physiology 51 (1): 91-102 (2010)es_ES
dc.description12 páginas, 5 figuras, 2 tablas.es_ES
dc.description.abstractThe identification of Fe transport forms in plant xylem sap is crucial to the understanding of long-distance Fe transport processes in plants. Previous studies have proposed that Fe may be transported as an Fe–citrate complex in plant xylem sap, but such a complex has never been detected. In this study we report the first direct and unequivocal identification of a natural Fe complex in plant xylem sap. A tri-Fe(III), tri-citrate complex (Fe3Cit3) was found in the xylem sap of Fe-deficient tomato (Solanum lycopersicum Mill. cv. ‘Tres Cantos’) resupplied with Fe, by using an integrated mass spectrometry approach based on exact molecular mass, isotopic signature and Fe determination and retention time. This complex has been modeled as having an oxo-bridged tri-Fe core. A second complex, a di-Fe(III), di-citrate complex was also detected in Fe–citrate standards along with Fe3Cit3, with the allocation of Fe between the two complexes depending on the Fe to citrate ratio. These results provide evidence for Fe–citrate complex xylem transport in plants. The consequences for the role of Fe to citrate ratio in long-distance transport of Fe in xylem are also discussed.es_ES
dc.description.sponsorshipThis work was supported by the Spanish Ministry of Science and Innovation (grant numbers AGL2006-1416, AGL2007-61948 and CTQ2006-05722, co-financed with FEDER); the European Commission (Thematic Priority 5—Food Quality and Safety, 6th Framework RTD Programme, grant number FP6-FOOD-CT-2006-016279) and the Aragón Government (groups A03 and E39). Acquisition of the HPLC–TOFMS apparatus was cofinanced with FEDER. R.R.-A., J.G.-M.-S., I.O. and J.A.R.-C. were supported by FPI-MICINN, FICYT-MICINN, CONAID-DGA and FPU-MICINN grants, respectively.es_ES
dc.publisherOxford University Presses_ES
dc.subjectIron deficiencyes_ES
dc.subjectMass spectrometryes_ES
dc.subjectXylem sapes_ES
dc.subjectIron transportes_ES
dc.titleIdentification of a Tri-Iron(III), Tri-Citrate Complex in the Xylem Sap of Iron-Deficient Tomato Resupplied with Iron: New Insights into Plant Iron Long-Distance Transportes_ES
dc.description.peerreviewedPeer reviewedes_ES
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