Reactive Oxygen Species in Growth and Development
The spatial control of cell growth is a central process in plant development. Reactive oxygen species (ROS) are important regulators of cell and organ growth and are thought to operate by controlling the extensibility of the cell wall and modulating intracellular signalling processes. By increasing elasticity of the wall they promote growth, and by cross-linking polymers they increase rigidity and repress growth. ROS produced by NADPH oxidase proteins are also important regulators of tip growth in root hairs and pollen tubes, where they not only control wall rigidity but also control cell signalling events involving calcium and MAP kinases cascades. Models for the roles of ROS in the control of cell growth during development have been proposed and are reviewed here.
KeywordsReactive Oxygen Species Reactive Oxygen Species Production Pollen Tube Root Hair Reactive Oxygen Species Accumulation
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