Abstract
Flagellar antigen specificity was studied for the speciesPseudomonas syringae, P. viridiflava andP. cichorii. After checking their motility, bacteria were reacted against six polyclonal antisera containing anti-O (LPS) and anti-H (flagellar) antibodies by indirect immunofluorescent staining. Two distinct flagellar serotypes (H1 and H2) were described. The distribution of H1 and H2 serotypes was then determined for a collection of 88 phytopathogenicPseudomonas strains. Serotype H1 was possessed byP. syringae pv.aptata (12 strains),P. s. pv.helianthi (2),P. s. pv.pisi (11), andP. s. pv.syringae (13). Serotype H2 was possessed byP. cichorii (2),P. s. pv.delphinii (1),P. s. pv.glycinea (4),P. s. pv.lacrymans (1),P. s. pv.mori (1),P. s. pv.morsprunorum (10),P. s. pv.persicae (1),P. s. pv.phaseolicola (8),P. s. pv.tabaci (10) andP. s. pv.tomato (1).P. viridiflava (5) revealed HI, H2 and untyped flagella. The following isolates were untypable by the H1/H2 system:P. corrugata (3),P. fluorescens (2),P. tolaasii (1). H1/H2 serotypes distribution is not linked toP. syringae O-serogroups. On the other hand, H1/H2 distribution seems remarkably linked to the new genospecies of theP. syringae group.
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