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- W1955066920 abstract "A copper-resistant strain (09906) of Pseudomonas fluorescens that was isolated from a citrus grove soil is being investigated as a biological control agent for Phytophthora root rot. Since citrus grove soils in California are often contaminated with copper from many years of copper fungicide applications, the role of copper resistance in survival of strain 09906 was investigated. Three copper-sensitive Tn5 mutants were obtained with insertions in different chromosomal DNA regions. These insertions were not in the chromosomal region that hybridized with the copper resistance operon (cop) cloned from Pseudomonas syringae. A copper-sensitive mutant survived as well as the wild type in a sterile loamy sand without added copper, but with 10 and 15 micrograms of CuSO4 added per g of soil, populations of the copper-sensitive mutant were 27- and 562-fold lower, respectively, than that of the wild type after a 25-day period. In a sterilized citrus grove soil, populations of the copper-sensitive mutant and wild-type strain were similar, but in nonsterile citrus soil, populations of the copper-sensitive mutant were 112-fold lower than the wild type after 35 days. These data suggest that copper resistance genes can be important factors in persistence of P. fluorescens in soil contaminated with copper. In addition, these genes appear to play a role in competitive fitness, even in soils with a low copper content." @default.
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- W1955066920 date "1993-02-01" @default.
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- W1955066920 title "Role of copper resistance in competitive survival of Pseudomonas fluorescens in soil" @default.
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- W1955066920 doi "https://doi.org/10.1128/aem.59.2.580-584.1993" @default.
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