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Ethylene is an endogenous stimulator of cell division in the cambial meristem of Populus |
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Love J, Bjorklund S, Vahala J, Hertzberg M, Kangasjarvi J, Sundberg B, 2009, Ethylene is an endogenous stimulator of cell division in the cambial meristem of Populus. PNAS 106(14): 5984-5989.
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.
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