title: AtMKK1 mediates ABA-induced CAT1 expression and H2O2 production via AtMPK6-coupled signaling in Arabidopsis.
abstract: Catalase controls cellular H(2)O(2) and plays important roles in the adaptation of plants to various stresses, but little is known about the signaling events that lead to the expression of CAT1 and the production of H(2)O(2). Here we report the dependence of CAT1 expression and H(2)O(2) production on a mitogen-activated protein kinase (MAPK) cascade. CAT1 transcript was induced in an ABA-dependent way and the induction was abolished in the T-DNA insertion mutant mkk1 (SALK_015914), while AtMKK1 overexpression significantly enhanced the ABA-induced CAT1 expression and H(2)O(2) production. AtMPK6, another component in the MAPK cascade, was also involved: mpk6 mutant blocked and overexpressing AtMPK6 enhanced the ABA-dependent expression of CAT1 and H(2)O(2) production. The activity of AtMPK6 was increased by ABA in an AtMKK1-dependent manner. These data clearly suggest an ABA-dependent signaling pathway connecting CAT1 expression through a phosphorelay including AtMKK1 and AtMPK6. In further support of this view, mkk1 mutant reduced both the sensitivity to ABA during germination and the drought tolerance of seedlings, whereas the AtMKK1 overexpression line showed the opposite responses when compared with the wild type. The data suggest AtMKK1-AtMPK6 to be a key module in an ABA-dependent signaling cascade causing H(2)O(2) production and stress responses.
authors.affiliation: Department of Biology, Hong Kong Baptist University, Hong Kong, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Xing
authors.forename: Wensuo
authors.initials: W
authors.lastname: Jia
authors.forename: Jianhua
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology*; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002374:Catalase / Q000235:genetics / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000378:metabolism*; D048369:MAP Kinase Kinase 1 / Q000235:genetics / Q000378:metabolism; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism; D008957:Models, Genetic; D010641:Phenotype; D010937:Plant Growth Regulators / Q000494:pharmacology; D030821:Plants, Genetically Modified; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000187:drug effects; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D029681:Arabidopsis Proteins; D010937:Plant Growth Regulators; D000040:Abscisic Acid; D006861:Hydrogen Peroxide; D002374:Catalase; C436292:AtMPK4 protein, Arabidopsis; C436293:MPK6 protein, Arabidopsis; D020928:Mitogen-Activated Protein Kinases; D048369:MAP Kinase Kinase 1