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PLANT PHYSIOLOGY , Vol 104, Issue 1 209-215, Copyright © 1994 by American Society of Plant Biologists
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PLANT-MICROBE INTERACTIONS |
Plant Defense Response to Fungal Pathogens (Activation of Host-Plasma Membrane H+-ATPase by Elicitor-Induced Enzyme Dephosphorylation)
R. Vera-Estrella, B. J. Barkla, V. J. Higgins and E. Blumwald
Centre for Plant Biotechnology and Department of Botany, University of Toronto, Toronto, Ontario, M5S 3B2 Canada
Elicitor preparations containing the avr5 gene products from race 4 of
Cladosporium fulvum and tomato (Lycopersicon esculentum L.) cells near
isogenic for the resistance gene Cf5 were used to investigate events
following the treatment of host plasma membranes with elicitor. A 4-fold
increase in H+-ATPase activity, coincident with the acidification of the
extracellular medium, was detected immediately after elicitor treatment.
The elicitor-induced stimulation of the plasma membrane H+-ATPase was
inhibited by okadaic acid but not by staurosporine, suggesting that protein
dephosphorylation was required for increased H+-ATPase activity. This
observation was confirmed by [gamma]-32P labeling and immunodetection of
the plasma membrane H+-ATPase. Effects of guanidine nucleotide analogs and
mastoparan on the ATPase activity suggested the role of GTP-binding
proteins in mediating the putative elicitor-receptor binding, resulting in
activation of a phosphatase(s), which in turn stimulates the plasma
membrane H+-ATPase by dephosphorylation.
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