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Proc Natl Acad Sci U S A. 2003 Sep 30;100(20):11783-8. Epub 2003 Sep 16.

Cell wall arabinan is essential for guard cell function.

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  • 1CNAP, Department of Biology, University of York, Heslington, York YO10 5DD, United Kingdom.

Abstract

Stomatal guard cells play a key role in the ability of plants to survive on dry land, because their movements regulate the exchange of gases and water vapor between the external environment and the interior of the plant. The walls of these cells are exceptionally strong and must undergo large and reversible deformation during stomatal opening and closing. The molecular basis of the unique strength and flexibility of guard cell walls is unknown. We show that degradation of cell wall arabinan prevents either stomatal opening or closing. This locking of guard cell wall movements can be reversed if homogalacturonan is subsequently removed from the wall. We suggest that arabinans maintain flexibility in the cell wall by preventing homogalacturonan polymers from forming tight associations.

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