Biogeography and Degree of Endemicity of Fluorescent Pseudomonas Strains in Soil
Identifieur interne : 000E42 ( Main/Exploration ); précédent : 000E41; suivant : 000E43Biogeography and Degree of Endemicity of Fluorescent Pseudomonas Strains in Soil
Auteurs : Jae-Chang Cho ; James M. TiedjeSource :
- Applied and Environmental Microbiology [ 0099-2240 ] ; 2000.
Abstract
Fluorescent
Url:
PubMed: 11097926
PubMed Central: 92480
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>Fluorescent <italic>Pseudomonas</italic>
strains were isolated from 38 undisturbed pristine soil samples from 10 sites on four continents. A total of 248 isolates were confirmed as <italic>Pseudomonas</italic>
sensu stricto by fluorescent pigment production and group-specific 16S ribosomal DNA (rDNA) primers. These isolates were analyzed by three molecular typing methods with different levels of resolution: 16S rDNA restriction analysis (ARDRA), 16S-23S rDNA intergenic spacer-restriction fragment length polymorphism (ITS-RFLP) analysis, and repetitive extragenic palindromic PCR genomic fingerprinting with a BOX primer set (BOX-PCR). All isolates showed very similar ARDRA patterns, as expected. Some ITS-RFLP types were also found at every geographic scale, although some ITS-RFLP types were unique to the site of origin, indicating weak endemicity at this level of resolution. Using a similarity value of 0.8 or more after cluster analysis of BOX-PCR fingerprinting patterns to define the same genotypes, we identified 85 unique fluorescent <italic>Pseudomonas</italic>
genotypes in our collection. There were no overlapping genotypes between sites as well as continental regions, indicating strict site endemism. The genetic distance between isolates as determined by degree of dissimilarity in BOX-PCR patterns was meaningfully correlated to the geographic distance between the isolates' sites of origin. Also, a significant positive spatial autocorrelation of the distribution of the genotypes was observed among distances of <197 km, and significant negative autocorrelation was observed between regions. Hence, strong endemicity of fluorescent <italic>Pseudomonas</italic>
genotypes was observed, suggesting that these heterotrophic soil bacteria are not globally mixed.</p>
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