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Published on August 4, 2006; 10.1104/pp.106.086140

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Received July 5, 2006
Accepted July 19, 2006

Transgenic Tobacco Plants Overexpressing Chitinases of Fungal Origin Show Enhanced Resistance to Biotic and Abiotic Stress Agents

María de las Mercedes Dana , José A. Pintor-Toro *, and Beatriz Cubero

Instituto de Recursos Naturales y Agrobiología de Sevilla. CSIC. Avda Reina Mercedes, 10. 41012-Sevilla, Spain

* Corresponding author; email: pintor{at}cica.es.

Genes encoding defense-related proteins have been used to alter the resistance of plants to pathogens and other environmental challenges, but no single fungal gene overexpression has produced broad-spectrum stress resistance in transgenic lines. We have generated transgenic tobacco lines that overexpress the endochitinases CHIT33 and CHIT42 from the mycoparasitic fungus Trichoderma harzianum, and have evaluated their tolerance to biotic and abiotic stress. Both CHIT33 and CHIT42, individually, conferred broad resistance to fungal and bacterial pathogens, salinity and heavy metals. Such broad-range protective effects came off with no obvious detrimental effect on the growth of tobacco plants




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