Specificity of Polyclonal Antibodies to Different Antigenic Preparations of Pseudomonas-Syringae Pv Pisi Strain Uqm551 and Pseudomonas-Syringae Pv Syringae Strain-L

Polyclonal antibodies were produced against sonicated and heat‐killed cells of Pseudomonas syringae pv. pisi strain UQM551 and Pseudomonas syringae pv. syringae strain L, and their specificities were compared. Evidence is presented that the serological specificity between these two pathovars lies in surface antigens. Of the surface antigens purified and tested, only flagella and lipopolysaccharide from the cell wall showed no cross‐reactivity with heterologous antisera. Antisera to glutaraldehyde‐fixed flagella of the two strains showed a high level of specificity. At a species or genus level, antisera prepared from heat‐killed cells ofP. syringae distinguished this species from all other bacterial species and genera tested, including strains of Pseudomonas fluorescens, Escherichia coli, Agrobacterium and Rhizobium.