title: ORA47 (octadecanoid-responsive AP2/ERF-domain transcription factor 47) regulates jasmonic acid and abscisic acid biosynthesis and signaling through binding to a novel cis-element.
abstract: ORA47 (octadecanoid-responsive AP2/ERF-domain transcription factor 47) of Arabidopsis thaliana is an AP2/ERF domain transcription factor that regulates jasmonate (JA) biosynthesis and is induced by methyl JA treatment. The regulatory mechanism of ORA47 remains unclear. ORA47 is shown to bind to the cis-element (NC/GT)CGNCCA, which is referred to as the O-box, in the promoter of ABI2. We proposed that ORA47 acts as a connection between ABA INSENSITIVE1 (ABI1) and ABI2 and mediates an ABI1-ORA47-ABI2 positive feedback loop. PORA47:ORA47-GFP transgenic plants were used in a chromatin immunoprecipitation (ChIP) assay to show that ORA47 participates in the biosynthesis and/or signaling pathways of nine phytohormones. Specifically, many abscisic acid (ABA) and JA biosynthesis and signaling genes were direct targets of ORA47 under stress conditions. The JA content of the P35S:ORA47-GR lines was highly induced under wounding and moderately induced under water stress relative to that of the wild-type plants. The wounding treatment moderately increased ABA accumulation in the transgenic lines, whereas the water stress treatment repressed the ABA content. ORA47 is proposed to play a role in the biosynthesis of JA and ABA and in regulating the biosynthesis and/or signaling of a suite of phytohormone genes when plants are subjected to wounding and water stress.
authors.affiliation: Institute of Plant Biology, National Taiwan University, Taipei, 10617, Taiwan.
authors.forename: Hsing-Yu
authors.initials: HY
authors.lastname: Chen
authors.affiliation: Institute of Plant Biology, National Taiwan University, Taipei, 10617, Taiwan.
authors.forename: En-Jung
authors.initials: EJ
authors.lastname: Hsieh
authors.affiliation: Institute of Plant Biology, National Taiwan University, Taipei, 10617, Taiwan.
authors.forename: Mei-Chun
authors.initials: MC
authors.lastname: Cheng
authors.affiliation: Department of Bio-lndustrial Mechatronics Engineering, National Taiwan University, Taipei, 10617, Taiwan.
authors.forename: Chien-Yu
authors.initials: CY
authors.lastname: Chen
authors.affiliation: Department of Life Science, National Taiwan Normal University, Taipei, 11677, Taiwan.
authors.forename: Shih-Ying
authors.initials: SY
authors.lastname: Hwang
authors.affiliation: Institute of Plant Biology, National Taiwan University, Taipei, 10617, Taiwan.
authors.forename: Tsan-Piao
authors.initials: TP
authors.lastname: Lin
mesh_terms: D000040:Abscisic Acid / Q000096:biosynthesis*; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D003517:Cyclopentanes / Q000378:metabolism*; D003681:Dehydration; D018506:Gene Expression Regulation, Plant; D054883:Oxylipins / Q000378:metabolism*; D010641:Phenotype; D010937:Plant Growth Regulators / Q000378:metabolism; D030821:Plants, Genetically Modified; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000378:metabolism; D015398:Signal Transduction; D015534:Trans-Activators / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D003517:Cyclopentanes; D054883:Oxylipins; D010937:Plant Growth Regulators; D012333:RNA, Messenger; D012097:Repressor Proteins; D015534:Trans-Activators; C011006:jasmonic acid; D000040:Abscisic Acid
keywords: AP2/ERF domain gene; Arabidopsis thaliana; O-box; ORA47 (octadecanoid-responsive AP2/ERF-domain transcription factor 47); abscisic acid (ABA); jasmonic acid (JA); water stress; wounding