Antioxidants and Cell Signaling by ROS and RNS

This sub-line studies the function of different reactive oxygen and nitrogen species (ROS y RNS) in the cell signal transduction pathways and expression of antioxidative systems during plant development and fruit ripening, and in the response to abiotic and biotic stresses, using physiological, biochemical, molecular and cellular approaches. Different plant species are used (pea, pepper, olive and Arabidopsis) which are subjected to abiotic stresses, mainly by cadmium, the xenobiotic 2,4-D (2,4-dichlorophenoxyacetic acid) and high solar radiation, and to biotic stress produced by the pathogen Pseudomonas syringae. The ROS and RNS studied include superoxide radicals (O2-), hydrogen peroxide (H2O2), nitric oxide (NO), S-nitrosoglutathione (GSNO), and peroxynitrite (ONOO-). In plants, like in microorganisms and animals, these signal molecules seem to be involved in the cell communication systems (cross-talk), in the expression of specific genes of defence, and in the activation of the process of programmed cell death (PCD).


abiotic stress; antioxidants; Arabidopsis thaliana; biotic stress; Cd; oxidative stress; H2O2; nitric oxide (NO); nitrosative stress; S-nitrosoglutatione (GSNO); olive (Olea europaea L.); pea (Pisum sativum L.); pepper (Capsicum annuum L.); peroxisomes; peroxynitrite (ONOO-); plant tolerance; ROS; RNS; signaling; 2,4-D