IPEEC - CENPAT   25619
INSTITUTO PATAGONICO PARA EL ESTUDIO DE LOS ECOSISTEMAS CONTINENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Seasonal rainfalls modify polyphenols profile in a native grass species from semiarid regions.
Autor/es:
ARSLAN I; REGINATO M.; LUNA M.V.; VARELA M.C.; CENZANO A.M.
Lugar:
Mendoza
Reunión:
Otro; XXXIV Reunión Científica Anual de la Sociedad de Biología de Cuyo. Aspectos básicos- traslacionales en ciencias biológicas.; 2016
Institución organizadora:
Universidad Nacional de Cuyo
Resumen:
Native species from semiarid regions have developed a powerful antioxidant system to survive during drought seasons. Polyphenols have antioxidant capacity and can help the plant to survive and develop. The aim of this work was to identify the different phenolic compounds produced by Pappostipa speciosa during two seasons with different water availability. We identified 14 molecules determined by HPLC-ESI-MS and the antioxidant capacity of these compounds was calculated by free radical assay techniques. Their contribution to overall antioxidant activity was also estimated based on their chemical structure. The molecules identified were phenolic compounds, as flavonoids and non-flavonoids. Most of the flavonoids conjugated with sugar were identified in the rainy season while no-flavonoids and free flavonoids were identified in the dry season. Despite the fact that the polyphenols profile was different between the two seasons analyzed, the antioxidant capacity was similar. These results suggest that in rainy season the main role of phenolic compounds is acting as intermediaries in metabolic pathways, while in dry seasons their main roles are as antioxidant molecules which reactive groups (HO-) in their chemical structure are not bond to sugars or any other compound, being available to scavenge EROs. Also, they can form polymers useful to strengthen the cell walls to reinforce plant tissues such as xylem vessels under stressful conditions.