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Plant Cell, Vol. 10, 371-382, Copyright © 1998, American Society of Plant Physiologists
Ethylene Regulates the Susceptible Response to Pathogen Infection in Tomato
Steven T. Lunda,
Robert E. Stallb, and
Harry J. Kleea
a Department of Horticultural Sciences, University of Florida, Gainesville, Florida 32611
b Department of Plant Pathology, University of Florida, Gainesville, Florida 32611
Correspondence to:
Harry J. Klee, hjklee{at}gnv.ifas.ufl.edu (E-mail), 352-846-2063 (fax).
Ethylene evolution occurs concomitantly with the progression of disease symptoms in response to many virulent pathogen infections in plants. A tomato mutant impaired in ethylene perceptionNever ripeexhibited a significant reduction in disease symptoms in comparison to the wild type after inoculations of both genotypes with virulent bacterial (Xanthomonas campestris pv vesicatoria and Pseudomonas syringae pv tomato) and fungal (Fusarium oxysporum f sp lycopersici) pathogens. Bacterial spot disease symptoms were also reduced in tomato genotypes impaired in ethylene synthesis (1-aminocyclopropane-1-carboxylic acid deaminase) and perception (14893), thereby corroborating a reducing effect for ethylene insensitivity on foliar disease development. The reduction in foliar disease symptoms in Never ripe plants was a specific effect of ethylene insensitivity and was not due to reductions in bacterial populations or decreased ethylene synthesis. PR-1B1 mRNA accumulation in response to X. c. vesicatoria infection was not affected by ethylene insensitivity, indicating that ethylene is not required for defense gene induction. Our findings suggest that broad tolerance of diverse vegetative diseases may be achieved via engineering of ethylene insensitivity in tomato.
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