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Plant Cell, Vol. 11, 223-236, February 1999, Copyright © 1999, American Society of Plant Physiologists

Pathogen-Induced Elicitin Production in Transgenic Tobacco Generates a Hypersensitive Response and Nonspecific Disease Resistance

Harald Kellera, Nicole Pamboukdjiana, Michel Poncheta, Alain Poupeta, René Delonb, Jean-Louis Verrierb, Dominique Robyc, and Pierre Riccia
a Institut National de la Recherche Agronomique (INRA), Station de Botanique et de Pathologie Végétale, BP 2078, F-06606 Antibes Cedex, France
b Seita, Institut du Tabac, Domaine de la Tour, F-24100 Bergerac, France
c INRA/Centre National de la Recherche Scientifique, Laboratoire de Biologie Moléculaire des Relations Plantes/Microorganismes, F-31326 Castanet-Tolosan, France

Correspondence to: Harald Keller, keller{at}antibes.inra.fr (E-mail), 33-493-67-88-88 (fax)

The rapid and effective activation of disease resistance responses is essential for plant defense against pathogen attack. These responses are initiated when pathogen-derived molecules (elicitors) are recognized by the host. We have developed a strategy for creating novel disease resistance traits whereby transgenic plants respond to infection by a virulent pathogen with the production of an elicitor. To this end, we generated transgenic tobacco plants harboring a fusion between the pathogen-inducible tobacco hsr 203J gene promoter and a Phytophthora cryptogea gene encoding the highly active elicitor cryptogein. Under noninduced conditions, the transgene was silent, and no cryptogein could be detected in the transgenic plants. In contrast, infection by the virulent fungus P. parasitica var nicotianae stimulated cryptogein production that coincided with the fast induction of several defense genes at and around the infection sites. Induced elicitor production resulted in a localized necrosis that resembled a P. cryptogea–induced hypersensitive response and that restricted further growth of the pathogen. The transgenic plants displayed enhanced resistance to fungal pathogens that were unrelated to Phytophthora species, such as Thielaviopsis basicola, Erysiphe cichoracearum, and Botrytis cinerea. Thus, broad-spectrum disease resistance of a plant can be generated without the constitutive synthesis of a transgene product.




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