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Molekulare Signalverarbeitung
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Plants mount a complex array of defense reactions in response to attack by pathogens. Initiation of these events depends on perception and signal transduction of elicitors, which are plant-derived or pathogenderived signals, that give rise to transcriptional activation of defense-related genes as well as to changes in activities of enzymes involved in cell wall reinforcement and oxygen radical formation. An oligopeptide, identified within a 42 kDa glycoprotein elicitor from Phythophthora sojae, activates in parsley cells typical plant defense reactions, enabling researchers to study plant-pathogen interaction at the single cell level. The oligopeptide elicitor was found to be necessary and sufficient to stimulate a complex defense response in parsley cells, comprising H+/Ca2+ influxes, K+/Cl- effluxes, activation of a mitogen-activated protein (MAP) kinase, an oxidative burst, defense-related gene activation, and phytoalexin formation.