Abstract
Thirty strains of Pseudomonas syringae pv. maculicola and four of P. s. tomato were collected from diverse localities and compared for symptom expression, host range, temperature response, and plasmid profile. The P. s. maculicola strains induced one of three distinct lesion types on crucifer hosts: chlorotic, water-soaked, or necrotic. Each of five P. s. maculicola strains that caused chlorotic lesions synthesized coronatine as confirmed by bioassay and by gas chromatographic and mass spectrometric analyses of culture filtrates. Four other strains that caused either water-soaked or necrotic lesions did not synthesize coronatine. Plasmid profiles of 25 P. s. maculicola strains contained from zero to seven plasmids ranging from 11 to 105 kb (.)
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