Evaluation of determinative tests for pathovars of Pseudomonas syringae van Hall 1902

摘要

The utility of 36 presumptive determinative tests for 32 pathovars ofPseudomonas syringaewas investigated. A total of 395 strains was examined. Most strains of 12 of these pathovars (Ps. syringaepv.cannabina, Ps. syr. delphinii, Ps. syr. glycinea, Ps. syr. helianthi, Ps. syr. lachrymans, Ps. syr. mori, Ps. syr. morsprunorum, Ps. syr. phaseolicola, Ps. syr. ‘porri’, Ps. syr. papulans, Ps. syr. savastanoiandPs. syr. tabaci) formed clusters when test data were compared by centroid analysis.Pseudomonas syr. syringae, Ps. syr. aptata, Ps. syr. atrofaciens, Ps. syr. dysoxyliandPs. syr. japonicaformed a single cluster, indicating their possible synonymy. Strains ofPs. syr. antirrhiniandPs. syr. tomatowere indistinguishable, as were those ofPs. syr. garcaeandPs. syr. oryzae.Strains ofPs. syr. berberidis, Ps. syr. coronafaciens, Ps. syr. eriobotryae, Ps. syr. maculicola, Ps. syr. passiflorae, Ps. syr. pisiandPs. syr. striafaciensandPs. syr. tagetisdid not form distinguishable clusters.The tests which reliably differentiated pathovars are recorded in a determinative sch