CEFOBI   05405
CENTRO DE ESTUDIOS FOTOSINTETICOS Y BIOQUIMICOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Regulation of photosynthetic malic enzymes in C4 millets
Autor/es:
GERRARD WHEELER, M. C.; ANDREO, C. S.; LOBERTTI, C.; SAIGO, M.; DRINCOVICH, M. F.
Lugar:
Córdoba
Reunión:
Congreso; LII Reunión Anual SAIB; 2016
Institución organizadora:
SAIB
Resumen:
Setaria italica (foxtail millet) and Panicum virgatum (switchgrass ) belong to the group of millets that carry out photosynthesis C4. In theses species the initial CO2 fixation yields C4 acids within the mesophyll cells which are then transported to the bundle sheath cells where they are decarboxylated. The resulting CO2 is incorporated into the Calvin cycle. In S. italica the decarboxylating enzyme that provides most of the CO2 to the assimilative process is a chloroplastic NADP-dependent malic enzyme (NADP-ME) while in switchgrass a mitochondrial NAD-dependent malic enzyme (ME-NAD) is the main decarboxylating enzyme . In this study we analyzed the biochemical and molecular processes that regulate the expression and activity of each decarboxylase. The aim of this work was to identify the key processes linked with the efficient decarboxylation of C4 compounds in vascular sheath cells. The characterization of these processes is a central point in the main objective of introducing mechanisms concentration of carbon dioxide in C3 species to increase the efficiency of carbon assimilation.