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pubmed-article:2137121pubmed:abstractTextErwinia amylovora 1430 was shown to be sensitive to Mu G(-) particles. Infection resulted either in lytic development or in lysogenic derivatives with insertion of the Mu genome at many sites in the bacterial chromosome. We used the Mu d1Bx::Tn9 (lac Apr Cmr) derivative, called Mu dX, to identify mutants affected in pathogenicity and in their ability to induce a hypersensitive reaction (HR) on tobacco plants. Inoculation of 1,400 lysogenic derivatives on apple root calli led to the identification of 12 mutants in three classes: (i) class 1 mutants were nonpathogenic and unable to induce an HR on tobacco plants; (ii) class 2 mutants were nonpathogenic but retained the ability to induce an HR; and (iii) class 3 mutants showed attenuated virulence. Of the 12 mutants, 8 had a single insertion of the Mu dX prophage. For class 1 and 2 mutants, reversion to pathogenicity was concomitant with the loss of the Mu dX prophage. Furthermore, revertants from the class 1 mutants also recovered the ability to induce an HR on tobacco plants. Five of the six class 3 mutants were impaired in exopolysaccharide production. No changes of the envelope structure (lipopolysaccharide and outer membrane proteins) were correlated with differences in pathogenicity. One class 3 mutant did not produce any functional siderophore, suggesting that iron uptake could be involved in pathogenicity.lld:pubmed
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pubmed-article:2137121pubmed:authorpubmed-author:VannesteJ LJLlld:pubmed
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pubmed-article:2137121pubmed:articleTitleBacteriophage Mu as a genetic tool to study Erwinia amylovora pathogenicity and hypersensitive reaction on tobacco.lld:pubmed
pubmed-article:2137121pubmed:affiliationPathologie Végétale, Paris, France.lld:pubmed
pubmed-article:2137121pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2137121pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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