Plant Physiology 64:320-326 (1979)
© 1979 American Society of Plant Biologists
Articles
Cell Surfaces in Plant-Microorganism Interactions
II. Evidence for the Accumulation of Hydroxyproline-rich Glycoproteins in the Cell Wall of Diseased Plants as a Defense Mechanism 1,2
Marie-Thérèse Esquerré-Tugayé,
Claude Lafitte,
Dominique Mazau,
Alain Toppan and
André Touzé
a Université Paul Sabatier, Centre de Physiologie Végétale-LA 241 CNRS, 118 route de Narbonne, 31077 Toulouse, France
Enrichment of the cell wall in hydroxyproline-rich glycoprotein is involved in the defense of muskmelon (Cucumis melo) seedlings to Colletotrichum lagenarium, the causative agent of anthracnose. The extent to which this accumulation proceeds may be experimentally modified by treating plants with ethylene or growing them in the presence of free L-trans-hydroxyproline. It appears that the increase in the wall hydroxyproline-rich glycoprotein mediated through ethylene is paralleled by an increasing resistance of the host to the pathogen. Inversely, inhibiting the synthesis of this glycoprotein in diseased plants is strictly correlated to an accelerated and more intense colonization of the host by the pathogen.
In both cases, the inverse relationship between the accumulation of hydroxyproline-rich glycoproteins and the ability of the pathogen to develop in the host has been checked by the quantification, in infected tissues, of glucosamine, a characteristic component of chitin-containing fungi.
1 This work received financial support from the Centre National de la Recherche Scientifique (L.A. n° 241).
2 A preliminary report of this work was presented at a Symposium on "Cell Wall Biochemistry Related to Specificity in Host-Plant Pathogen Interactions", held in Tromsö, Norway, August 1976.
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