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El cobre y el zinc son cofactores esenciales de enzimas involucradas en multiples procesos fisiologicos (Finkelstein, 2009). En plantas participan, entre otros procesos, en la fotosintesis (Yruela, 2013), en la respiracion oxidativa (Ravet & Pilon, 2013), la floracion (Takahashi et al., 2003), y, en el caso de las leguminosas, en la fijacion simbiotica de nitrogeno (Brear et al., 2013; Gonzalez-Guerrero et al., 2016). Dada su importancia como nutrientes, se ha realizado un importante esfuerzo para entender como las plantas distribuyen y usan estos oligonutrientes metalicos. Sin embargo, este trabajo ha sido principalmente realizado en la planta modelo Arabidopsis thaliana (Penarrubia et al., 2015; Brumbarova et al., 2015) y en cereales (Nozoye et al., 2011; von Wiren et al., 1994). Por ello, mucho menos se conoce sobre como estos metales son transferidos por las leguminosas a sus nodulos radicales. En la presente Tesis Doctoral, hemos estudiado dos transportadores involucrados en el suministro de zinc para la fijacion simbiotica de nitrogeno, y uno involucrado en la incorporacion de cobre. Ademas, trabajando en este ultimo, se ha identificado a un homologo cercano que podria estar involucrado en la captacion de cobre de hongos formadores de micorrizas arbusculares. ABSTRACT Copper and zinc are essential cofactors of enzymes involved in multiple physiological processes (Finkelstein, 2009). In plants, they participate in photosynthesis (Yruela, 2013), oxidative respiration (Ravet & Pilon, 2013), flowering (Takahashi et al., 2003), and, in the case of legumes, in symbiotic nitrogen fixation (Brear et al., 2013; Gonzalez-Guerrero et al., 2016), among others. Given their importance as nutrients, a significant effort has been invested in understanding how plants distribute and used these essential metallic oligonutrients. However, this work has been mainly done in model plant Arabidopsis thaliana (Penarrubia et al., 2015; Brumbarova et al., 2015) and in cereals (Nozoye et al., 2011; von Wiren et al., 1994). Consequently, much less is known on how these metals are delivered by the legumes to their root nodules. In this PhD thesis, we have studied two transporters involved in zinc delivery for symbiotic nitrogen fixation, and one involved in copper uptake. In addition, while working on the later, we have also identified a close homologue putatively involved in copper uptake form arbuscular mycorrhizal fungi.

Papel de COPT1, COPT2, MTP2 y ZIP6 en el transporte y la homeostasis de metales en Medicago truncatula