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- W1486753795 abstract "There have been many attempts to control bacterial wilt with antagonistic bacteria or spontaneous nonpathogenic mutants of Pseudomonas solanacearum that lack the ability to colonize the host, but they have met with limited success. Since a large gene cluster ( hrp ) is involved in the pathogenicity of P. solanacearum , we developed a biological control strategy using genetically engineered Hrp - mutants of P. solanacearum. Three pathogenic strains collected in Guadeloupe (French West Indies) were rendered nonpathogenic by insertion of an ω-Km interposon within the hrp gene cluster of each strain. The resulting Hrp - mutants were tested for their ability to control bacterial wilt in challenge inoculation experiments conducted either under growth chamber conditions or under greenhouse conditions in Guadeloupe. Compared with the colonization by a pathogenic strain which spread throughout the tomato plant, colonization by the mutants was restricted to the roots and the lower part of the stems. The mutants did not reach the fruit. Moreover, the presence of the mutants did not affect fruit production. When the plants were challenge inoculated with a pathogenic strain, the presence of Hrp - mutants within the plants was correlated with a reduction in disease severity, although pathogenic bacteria colonized the stem tissue at a higher density than the nonpathogenic bacteria. Challenge inoculation experiments conducted under growth chamber conditions led, in some cases, to exclusion of the pathogenic strain from the aerial part of the plant, resulting in high protection rates. Furthermore, there was evidence that one of the pathogenic strains used for the challenge inoculations produced a bacteriocin that inhibited the in vitro growth of the nonpathogenic mutants." @default.
- W1486753795 created "2016-06-24" @default.
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- W1486753795 date "1994-09-01" @default.
- W1486753795 modified "2023-10-17" @default.
- W1486753795 title "Hrp <sup>-</sup> Mutants of <i>Pseudomonas solanacearum</i> as Potential Biocontrol Agents of Tomato Bacterial Wilt" @default.
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- W1486753795 doi "https://doi.org/10.1128/aem.60.9.3175-3181.1994" @default.
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