title: Reciprocal influence of ethylene and gibberellins on response-gene expression in Arabidopsis thaliana.
abstract: The complexity of hormonal responses and their functional overlap support the presence of an intensive cross-talk between hormone signalling pathways. A detailed analysis of responses induced by ethylene and gibberellin (GA) in a GA-insensitive mutant (gai), an ethylene-resistant mutant (etr1-3), the gai etr1-3 double-mutant, and in wild-type Arabidopsis thaliana plants, revealed multiple interactions between ethylene and GA signal transduction pathways. Ethylene insensitive mutants and wild-type plants treated with 1-methylcyclopropene (1-MCP), an ethylene perception inhibitor, displayed a stronger responsiveness of genes differentially regulated by GA. In addition, microarray-analysis showed that the GA-response in an ethylene-insensitive background is different from that in the wild-type, confirming the importance of ethylene in a plant's response towards GA. In this paper, we present a number of genes with an altered response-pattern as a direct consequence of cross-talk between ethylene and GA.
authors.affiliation: Unit Plant Hormone Signalling and Bio-imaging, Department of Molecular Genetics, Ghent University, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium.
authors.forename: Liesbeth
authors.initials: L
authors.lastname: De Grauwe
authors.forename: Wim H
authors.initials: WH
authors.lastname: Vriezen
authors.forename: Sophie
authors.initials: S
authors.lastname: Bertrand
authors.forename: Andy
authors.initials: A
authors.lastname: Phillips
authors.forename: Ana M
authors.initials: AM
authors.lastname: Vidal
authors.forename: Peter
authors.initials: P
authors.lastname: Hedden
authors.forename: Dominique
authors.initials: D
authors.lastname: Van Der Straeten
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D016000:Cluster Analysis; D003521:Cyclopropanes / Q000494:pharmacology; D005030:Ethylenes / Q000494:pharmacology*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D005875:Gibberellins / Q000494:pharmacology*; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D010937:Plant Growth Regulators / Q000494:pharmacology*; D012333:RNA, Messenger / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D029681:Arabidopsis Proteins; D003521:Cyclopropanes; C494590:ETR1 protein, Arabidopsis; D005030:Ethylenes; C109555:GAI protein, Arabidopsis; D005875:Gibberellins; D010937:Plant Growth Regulators; D012333:RNA, Messenger; D011956:Receptors, Cell Surface; C036216:ethylene; C412563:1-methylcyclopropene