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Plant Cell, Vol. 13, 303-318, February 2001, Copyright © 2001, American Society of Plant Physiologists

Wall-Associated Kinases Are Expressed throughout Plant Development and Are Required for Cell Expansion

Tanya A. Wagnera and Bruce D. Kohorna
a Biology Department, Room B353, LSRC, Duke University, Durham, North Carolina 27708

Correspondence to: Bruce D. Kohorn, kohorn{at}duke.edu (E-mail), 919-613-8177 (fax)

The mechanism by which events in the angiosperm cell wall are communicated to the cytoplasm is not well characterized. A family of five Arabidopsis wall-associated kinases (WAKs) have the potential to provide a physical and signaling continuum between the cell wall and the cytoplasm. The WAKs have an active cytoplasmic protein kinase domain, span the plasma membrane, and contain an N terminus that binds the cell wall. We show here that WAKs are expressed at organ junctions, in shoot and root apical meristems, in expanding leaves, and in response to wall disturbances. Leaves expressing an antisense WAK gene have reduced WAK protein levels and exhibit a loss of cell expansion. WAKs are covalently bound to pectin in the cell wall, providing evidence that the binding of a structural carbohydrate by a receptor-like kinase may have significance in the control of cell expansion.




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