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Lipopolysaccharides (LPS) were obtained by washing cells of plant pathogenic and saprophyticPseudomonas species with saline (fraction 1) and then with saline-EDTA (fraction 2). The cells subsequently were extracted with phenol to yield a third aqueous preparation (fraction 3). Each fraction type contained the LPS components, lipid A, heptose, 2-keto-3-deoxy sugar, and neutral and amino sugars. The neutral sugar compositions of fractions 1, 2, and 3, although similar within a species, differed between thePseudomonas species. The LPS of two pathovars (pv.) ofPseudomonas syringae had glucose and rhamnose as major components: 13 (±3)% glucose and 87 (±3)% rhamnose forP. syringae pv.pisi and 18 (±5)% glucose and 76 (±2)% rhamnose forP. syringae pv.syringae . Fucose was present in addition to glucose and rhamnose forP. syringae pv.phaseolicola (68 [±8]% rhamnose, 14 [±1]% fucose, and 14 [±5]% glucose) andP. syringae pv.tabaci (24 [±2]% rhamnose, 54 [±3]% fucose, and 17 [±1]% glucose). The LPS from different races ofP. syringae pv.pisi andP. syringae pv.phaseolicola could not be distinguished by neutral sugar composition. Three saprophytic species,P. aeruginosa, P. fluorescens , andP. putida , also produced LPS which had different proportions of rhamnose, fucose, and glucose. The LPS from three isolates ofP. putida were distinct in possessing a high proportion of amino sugar and containing glucose as the major neutral sugar component (86 to 100%). The LPS fractions from plant pathogenic and saprophyticPseudomonas species did not elicit browning or phytoalexin production in treated dark red kidney bean cotyledons or red Mexican bean leaves. Rather, chlorosis of the LPS-treated leaf tissue was observed.

Differences Between Lipopolysaccharide Compositions of Plant Pathogenic and Saprophytic Pseudomonas Species