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PLANT PHYSIOLOGY , Vol 115, Issue 1 87-92, Copyright © 1997 by American Society of Plant Biologists
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BIOCHEMISTRY AND ENZYMOLOGY |
Formation of Di-Isodityrosine and Loss of Isodityrosine in the Cell Walls of Tomato Cell-Suspension Cultures Treated with Fungal Elicitors or H2O2
J. D. Brady and S. C. Fry
The Edinburgh Cell Wall Group, Institute of Cell and Molecular Biology, The University of Edinburgh, Daniel Rutherford Building, The King's Buildings, Edinburgh EH9 3JH, United Kingdom
About 84% of the hydroxyproline residues in a cell culture of tomato
(Lycopersicon esculentum x Lycopersicon peruvianum) were present in
phenol-inextractable (i.e. covalently wall-bound) material. Treatment of
the cells with any of three fungal elicitors (wall fragments from
Phytophthora megasperma and Pythium aphanidermatum and xylanase from
Aureobasidium pullulans) or with 1 mM H2O2 had little effect on the
quantity of phenolinextractable hydroxyproline per milligram of
freeze-dried cells. However, each treatment induced a decrease in the
content of phenol-inextractable isodityrosine (Idt) residues. Each
treatment, except with the P. megasperma fragments, also induced an
increase in phenol-inextractable di- (Di-Idt). The increase in Di-Idt
partly accounted for the loss of Idt. We conclude that the elicitors and
H2O2 acted to reinforce the existing cross-linking of cell wall
(glyco)proteins by evoking oxidative coupling reactions to convert Idt to
Di-Idt plus unidentified products. The promotion of cross-linking by
elicitor treatment is proposed to be a defensive response that restricts
the penetration of pathogens.
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