Hypersensitive Response in Tomato toXanthomonas campestrispv.vesicatoria

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Abstract
A genotype of Lycopersicon esculentum, Hawaii 7998, produced a hypersensitive reaction when leaflets were infiltered with cells of Xanthomonas campestris pv. vesicatoris (X. c. vesicatoria). Electrolyte leakage increased in Hawaii 7998 12 hr after infiltration with 108 cfu/ml, whereas no increase was observed in Walter (known susceptible) after 24 hr. When leaflets of Hawaii 7998 were infiltered with 108, 107, 106 or 105 cfu/ml, electrolyte leakage greatly increased in leaflets 24 hr after infiltration with the first two inoculum levels but only slightly with 106. Two tolerant tomato genotypes (Campbell 28 and Ohio 4013) reacted similarly to Walter in electrolyte leakage. Population levels of X. c. vesicatoria in Hawaii 7998 leaflets were 50-100 times lower than in leaflets of Walter or any of the tolerant genotypes when inoculated with 105 cfu/ml. Leaflets of the same resistant and susceptible genotypes infiltrated with 108 cfu/ml of the bacterium did not differ greatly in bacterial populations after infiltration.

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