title: Relationship between chloroplastic H 2O 2 and the salicylic acid response.
abstract: Reactive oxygen species (ROS) act as signaling molecules for regulating plant responses to abiotic and biotic stress and there exist source- and kind-specific pathways for ROS signaling. Recently, we created a novel system for producing H 2O 2 in Arabidopsis chloroplasts by chemical-dependent thylakoid membrane-bound ascorbate peroxidase (tAPX) silencing using an estrogen-inducible RNAi method. Microarray analysis revealed that the expression of a large set of genes was altered in response to tAPX silencing, some of which are known to be involved in pathogen response/resistance. Furthermore, we found that tAPX silencing enhances the levels of salicylic acid (SA) and the response to SA, a central regulator for biotic stress response. In this addendum, we describe the relationship between chloroplastic H 2O 2 and SA in stress response, and discuss the function of the kind- and source-specific ROS signaling in SA-mediated stress response.
authors: Department of Advanced Bioscience, Faculty of Agriculture, Kinki University, Nakamachi, Nara, Japan.
authors: Masahiro
authors: M
authors: Noshi
authors: Takanori
authors: T
authors: Maruta
authors: Shigeru
authors: S
authors: Shigeoka
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D060387:Ascorbate Peroxidases / Q000235:genetics / Q000378:metabolism; D002736:Chloroplasts / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D020868:Gene Silencing / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000378:metabolism*; D019751:Intramolecular Transferases / Q000235:genetics / Q000378:metabolism; D020156:Salicylic Acid / Q000494:pharmacology*; D060431:Thylakoid Membrane Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D060431:Thylakoid Membrane Proteins; D006861:Hydrogen Peroxide; C555298:APXT protein, Arabidopsis; D060387:Ascorbate Peroxidases; D019751:Intramolecular Transferases; C058486:isochorismate synthase; D020156:Salicylic Acid