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handle: 10261/32378
[ES] Los objetivos generales de esta tesis doctoral son: a) desarrollar y aplicar nuevas metodologías analíticas que permitan la especiación química del Fe en los fluidos vegetales involucrados en el transporte a larga distancia de este elemento en plantas y b) estudiar el perfil de metabolitos de plantas cultivadas en condiciones de deficiencia de Fe. Para alcanzar estos objetivos generales se plantean los siguientes objetivos específicos: 1. Estudiar el efecto del pH y las reacciones de intercambio del metal o el ligando sobre la formación de complejos metálicos con nicotianamina mediante espectrometría de masas (MS) con analizador de tiempo de vuelo (TOF) y fuente de electrospray (ESI). 2. Desarrollar un método que permita la determinación de complejos naturales de Fe en plantas involucrados en el transporte de este elemento vía xilema mediante cromatografía líquida de alta resolución (HPLC) acoplada a ESI-TOFMS y espectrometría de masas con fuente de plasma de acoplamiento inductivo (ICP-MS). 3. Desarrollar un método que permita la determinación de ácidos orgánicos en tejidos vegetales mediante HPLC-ES-TOFMS. 4. Caracterizar los cambios en el perfil de metabolitos que se producen en condiciones de deficiencia y reaporte de Fe en las raíces de las plantas mediante cromatografía de gases acoplada a espectrometría de masas (GC-MS). 5. Caracterizar los cambios en el perfil de metabolitos que se producen en condiciones de deficiencia y reaporte de Fe en la savia de xilema y las hojas de las plantas mediante GC-MS.
[EN] The general objectives of this Thesis are: i) to develop and apply new analytical methodologies for the determination of the Fe forms involved in long-distance Fe transport in plants, and ii) to study the metabolite profile of plants grown under Fe-deficiency conditions. In order to achieve these general objectives the specific objectives are: 1. To study the formation of metal complexes with nicotianamine as affected by pH, ligand and metal exchange by means of electrospray time-of-flight mass spectrometry (ESI-TOFMS). 2. To develop a method for the determination of naturally occurring Fe complexes in xylem sap, using high performance liquid chromatography coupled to ESI-TOFMS and inductively coupled plasma mass spectrometry (HPLC-ESI-TOFMS and HPLC-ICP-MS, respectively). 3. To develop an HPLC-ESI-TOFMS method for the determination of organic acids in plant tissues. 4. To characterize the changes induced in the metabolite profile of plant roots in response to Fe deficiency and resupply, using gas chromatography coupled to mass spectrometry (GC-MS). 5. To characterize the changes induced in the metabolite profile of xylem sap and leaves of plants in response to Fe deficiency and resupply, using GC-MS.
This Thesis was supported by the Spanish MICINN (projects AGL2004- 00194 and AGL2007-61948, co-financed with FEDER), the European Commission (Thematic Priority 5- Food Quality and Safety, 6th Framework RTD Programme, Contract no. FP6- FOOD-CT-2006-016279) and the Aragón Government (group A03). Rubén Rellán Álvarez was supported by a FPI fellowship from the Spanish Ministry of Science and Innovation (MICINN).
Peer reviewed
195 Pag.
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