The role of ASCORBATE PEROXIDASE 2 in systemic signaling in Arabidopsis thaliana
(English)Manuscript (preprint) (Other academic)
Plants have to survive in a changing environment and adapt to different abiotic stresses like changes in light intensity or temperature, flooding and soil salinity. Stress conditions cause the increased production of reactive oxygen species (ROS). ROS detoxification requires the activity of different antioxidant systems, among them the H2O2 scavenging enzymes, ascorbate peroxidases (APXs). Many APX forms exist; specifically, a cytosolic APX2 whose expression is restricted to bundle sheath cells and is induced upon accumulation of H2O2 in the chloroplasts of these cells. While the regulation of APX2 expression is well examined, not much is known about its function. Here, the characterization of two APX2 knockout lines from Arabidopsis thaliana is described. The results indicated that APX2 activity does not affect resistance against excess light stress, but systemic signaling in response to excess light treatment.
reactive oxygen species, light stress, bundle sheath cells
Research subject Plant Physiology
IdentifiersURN: urn:nbn:se:su:diva-30833OAI: oai:DiVA.org:su-30833DiVA: diva2:274340