Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 14, Pages 5984-5989Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0811660106
Keywords
plant hormones; secondary xylem; tension wood; vascular cambium; wood development
Categories
Funding
- Academy of Finland
- Swedish Research Council for Environment, Agricultural Sciences, and Spatial Planning (FORMAS)
- FORMAS [229-2005-870]
- Finnish Centre of Excellence program
- Finnish Funding Agency
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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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