title: Ethylene is an endogenous stimulator of cell division in the cambial meristem of Populus.
abstract: The plant hormone ethylene is an important signal in plant growth responses to environmental cues. In vegetative growth, ethylene is generally considered as a regulator of cell expansion, but a role in the control of meristem growth has also been suggested based on pharmacological experiments and ethylene-overproducing mutants. In this study, we used transgenic ethylene-insensitive and ethylene-overproducing hybrid aspen (Populus tremula x tremuloides) in combination with experiments using an ethylene perception inhibitor [1-methylcyclopropene (1-MCP)] to demonstrate that endogenous ethylene produced in response to leaning stimulates cell division in the cambial meristem. This ethylene-controlled growth gives rise to the eccentricity of Populus stems that is formed in association with tension wood.
authors.affiliation: Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Love
authors.forename: Simon
authors.initials: S
authors.lastname: Björklund
authors.forename: Jorma
authors.initials: J
authors.lastname: Vahala
authors.forename: Magnus
authors.initials: M
authors.lastname: Hertzberg
authors.forename: Jaakko
authors.initials: J
authors.lastname: Kangasjärvi
authors.forename: Björn
authors.initials: B
authors.lastname: Sundberg
mesh_terms: D002455:Cell Division / Q000235:genetics*; D003521:Cyclopropanes / Q000494:pharmacology; D005030:Ethylenes / Q000096:biosynthesis*; D018519:Meristem / Q000166:cytology*; D030821:Plants, Genetically Modified; D032107:Populus / Q000166:cytology* / Q000254:growth & development
chemical_list: D003521:Cyclopropanes; D005030:Ethylenes; C036216:ethylene; C412563:1-methylcyclopropene