title: Cis- and trans-zeatin differentially modulate plant immunity.
abstract: Phytohormones are essential regulators of various processes in plant growth and development. Several phytohormones are also known to regulate plant responses to environmental stress and pathogens. Only recently, cytokinins have been demonstrated to play an important role in plant immunity. Increased levels of cytokinins such as trans-zeatin, which are considered highly active, induced resistance against mainly (hemi)biotrophic pathogens in different plant species. In contrast, cis-zeatin is commonly regarded as a cytokinin exhibiting low or no activity. Here we comparatively study the impact of both zeatin isomers on the infection of Nicotiana tabacum by the (hemi)biotrophic microbial pathogen Pseudomonas syringae. We demonstrate a biological effect of cis-zeatin and a differential effect of the two zeatin isomers on symptom development, defense responses and bacterial multiplication.
authors: Department of Plant Physiology; Institute of Plant Sciences; University of Graz; Graz, Austria.
authors: Dominik K
authors: DK
authors: Großkinsky
authors: Kerstin
authors: K
authors: Edelsbrunner
authors: Hartwig
authors: H
authors: Pfeifhofer
authors: Eric
authors: E
authors: van der Graaff
authors: Thomas
authors: T
authors: Roitsch
mesh_terms: D054884:Host-Pathogen Interactions; D010935:Plant Diseases; D057865:Plant Immunity; D020033:Protein Isoforms / Q000502:physiology; D044224:Pseudomonas syringae / Q000502:physiology*; D014026:Nicotiana / Q000276:immunology* / Q000382:microbiology; D015026:Zeatin / Q000502:physiology*
chemical_list: D020033:Protein Isoforms; D015026:Zeatin
keywords: Pseudomonas syringae; cytokinin; phytohormone; plant defense; plant immunity; plant pathogen interaction; plant resistance; tobacco; zeatin
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