Función de las especies de Nitrógeno reactivo en la modulación de respuesta de plántulas de girasol (Helianthus annuus L.) frente a procesos de estrés biótico y abiótico

Abstract

Nitric oxide (NO) is the reactive nitrogen species most relevant, has an important role in the regulation of plant functions. Thus, NO has been also showed to participate in the mechanism of plant response against biotic and abiotic stress conditions. However, less it is known about the involvement of other molecules derived from NO such as S-nitrosothiols, S-nitrosoglutathione, peroxynitrite and 3-nitrotyrosine. Therefore, this research work is focused in the study of the metabolism of NO and NO-related molecules in sunflower hypocotyl (Helianthus annuus L.) under biotic and abiotic stress conditions. For biotic stress, it was studied the inoculation by the pathogen Plasmopara halstedii using HA89 susceptible sunflower line where the pathogen develops its virulence (compatible interaction) and X55 line where the pathogen cannot develop (incompatible interaction). On the other hand, has been studied abiotic stress using the same plants exposed to six stress conditions including high and low temperature, mechanical wounding, high light intensity, continuous light and darkness.