Graduate Thesis Or Dissertation
 

Pathogenic and gel electrophoretic comparison of pseudomonads from fruit trees

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  • Sixty-two isolates of Pseudomonas, principally from fruit trees, were compared on the basis of LOPAT characteristics, pathogenicity, and protein band pattern produced by gel electrophoresis of soluble proteins. All but one of the oxidase negative isolates fell into LOPAT group Ia. The oxidase positive isolates were placed into groups IVa, Va, and Vb, with the majority being in group Va. Pathogenicity tests utilized cherry buds in the field and excised green fruits of cherry, prune, and pear in the laboratory. None of the oxidase positive isolates were pathogenic. Of the oxidase negative isolates, only Pseudomonas syringae and P. morsprunorum killed intact buds. Other pathogenic nomenspecies as well as some isolates of P. syringae were avirulent under these conditions. All of the P. syringae isolates were pathogenic on the three types of fruits. P. morsprunorum isolates were mildly pathogenic on cherry and prune but not on pear fruits. P. glycinea and P. phaseolicola also caused slight reactions on cherry fruits but not on the others. Electrophoretic data confirm the close relationship of the oxidase negative plant pathogens, as well as their distinction from the saprophytic species. Twenty-nine isolates of P. syringae had very similar but not identical protein band patterns. Band patterns of P. syringae, P. morsprunorum, P. lachrymans, P. glycinea, and P. phaseolicola were all similar but distinguishable from each other. The data support the placing of these oxidase negative plant pathogens in a single taxospecies but recognizing them as separate nomenspecies. The oxidase positive isolates were divided into several tentative groups on the basis of band pattern.
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