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In vivo detection of light stress induced reactive oxygen species in plants

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  • Biology
  • Ecology
  • Geography
  • Physics


untitled ABSTRACT OF Ph.D. THESIS During their life cycle plants are daily exposed to adverse environmental impacts, such as high intensities of photosynthetically active radiation, increased fluxes of ultraviolet radiation, extreme temperatures, water deprivation, air pollutants or pathogen attack, or to the combination of these. When plants are exposed to various stress conditions, a number of metabolic functions are affected through the generation of reactive oxygen species (ROS). These reactive, short-lived molecules are considered in variety of roles: as primary elicitors of damage or as important mediators of cellular damage. Lately IN VIVO DETECTION OF LIGHT STRESS INDUCED REACTIVE OXYGEN SPECIES IN PLANTS Ph.D. Thesis Csengele Barta Supervisor: Dr. Éva Hideg Biological Research Centre of the Hungarian Academy of Sciences Institute of Plant Biology Laboratory of Molecular Stress-and Photobiology their role as signal transduction molecules was also assessed, having important regulating role in the process of programmed cell death. ROS are produced in response to a variety of abiotic stresses, such as extreme temperature, UV irradiation, ozone exposure, osmotic stress or drought. ROS play a central role in the coordination of plant responses and are involved in acclimation responses and cross-talk as well. Although ROS perform a wide array of roles in plant cells, there is an evident controversy in their roles: they are necessary for the survival of plants, performing signal transduction and gene-activating roles, but they can as well be lethal when they are overproduced, due to the disturbance in the balance between their production and removal. Plants are equipped with a highly effective network of enzymatic- and non-enzymatic antioxidant system, and with effective excess energy dissipating systems, which prevent ROS-induced oxidative damage under physiological and mild stress conditions. By different acclimation

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