Journal Article

Ethylene regulates the susceptible response to pathogen infection in tomato

Lund, S.T. (University of Florida, Gainesville.), Stall, R.E, Klee, H.J

1998

Overview

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 perception--Never ripe--exhibited 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

• Publisher: American Society of Plant Physiologists
• Subject: biological resistance / Cloning, Molecular / Disease susceptibility / ETHYLENE / ETHYLENE INSENSITIVITY / ETHYLENE PERCEPTION / ETHYLENE PRODUCTION / Ethylenes / Ethylenes - pharmacology / EXPERIMENTAL INFECTION / FUNGAL DISEASES / fungal diseases of plants / Fusarium / Fusarium - pathogenicity / Fusarium - physiology / FUSARIUM OXYSPORUM / FUSARIUM OXYSPORUM F.SP. LYCOPERSICI / Gene Expression / Genes, Plant / genetics / Genotypes / immunology / IN VIVO EXPERIMENTATION / Infections / LEAVES / LYCOPERSICON ESCULENTUM / Lycopersicon esculentum - genetics / Lycopersicon esculentum - immunology / Lycopersicon esculentum - microbiology / microbiology / MUTANTS / Mutation / NEVER RIPE MUTANT / pathogenicity / Pathogens / pharmacology / physiology / PLANT DISEASES / Plant Leaves / PLANT PHYSIOLOGY / Plant Proteins / Plant Proteins - genetics / Plants / Plants - immunology / Pseudomonas / Pseudomonas - pathogenicity / Pseudomonas - physiology / PSEUDOMONAS SYRINGAE / PSEUDOMONAS SYRINGAE PV. TOMATO / REGULATION / Seedlings / Solanum lycopersicum / Solanum lycopersicum var. lycopersicum / SUSCEPTIBILITY / Symptoms / Virulence / WILTS / Xanthomonas campestris / Xanthomonas campestris - pathogenicity / Xanthomonas campestris - physiology / XANTHOMONAS CAMPESTRIS VESICATORIA / Xanthomonas vesicatoria