Distribution and diversity of type III secretion system-like genes in saprophytic and phytopathogenic fluorescent pseudomonads
| Autor: | Christophe Mougel, Mélanie Lemunier, Philippe Lemanceau, Séverine Siblot, Sylvie Mazurier |
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| Přispěvatelé: | ProdInra, Migration, Microbiologie, Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB) |
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
DNA
Bacterial Molecular Sequence Data Biology Plant Roots Polymerase Chain Reaction Applied Microbiology and Biotechnology Microbiology Fluorescence Type three secretion system law.invention PSEUDOMOMAS FLUORESCENS 03 medical and health sciences Bacterial Proteins law Pseudomonas RNA Ribosomal 16S Genotype Gene [SDV.MP] Life Sciences [q-bio]/Microbiology and Parasitology Soil Microbiology Polymerase chain reaction ComputingMilieux_MISCELLANEOUS Plant Diseases 030304 developmental biology 2. Zero hunger Genetics 0303 health sciences Ecology 030306 microbiology Genetic transfer Genetic Variation Sequence Analysis DNA Plants 16S ribosomal RNA biology.organism_classification [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology POUVOIR PATHOGENE Restriction fragment length polymorphism Polymorphism Restriction Fragment Length Bacteria |
| Zdroj: | FEMS Microbiology Ecology FEMS Microbiology Ecology, Wiley-Blackwell, 2004, 49, pp.455-467 |
| ISSN: | 0168-6496 1574-6941 |
| Popis: | Type three secretion systems (TTSSs) are protein translocation mechanisms associated with bacterial pathogenicity in host plants, and hypersensitive reactions in non-host plants. Distribution and diversity of TTSS-like genes within a collection of saprophytic and phytopathogenic fluorescent pseudomonads were characterized. This collection included 16 strains belonging to 13 pathogenic species, and 87 strains belonging to five saprophytic species isolated from plant rhizosphere and soil. Presence of conserved hypersensitive reaction/pathogenicity (hrp) genes (hrc RST) was assessed both by PCR using primers designed to amplify the corresponding sequence and by dot-blot hybridization using a PCR-amplified hrc RST fragment as a probe. PCR allowed the detection of TTSS-like genes in 75% and 32% of the phytopathogenic and saprophytic strains, respectively, and dot-blot hybridization in 100% and 49% of the phytopathogenic and saprophytic strains, respectively. The restriction fragment length polymorphism (RFLP) of 26 amplified hrc RST fragments revealed a considerable diversity. Twenty-one distinct RFLP types were identified and one hrc RST fragment was sequenced per RFLP type. The obtained hrc RST sequences clustered into three groups. Two of these groups included both phytopathogenic and saprophytic strains. The diversity of 16S rRNA genes, commonly used as an evolution marker, was characterized using PCR-RFLP. Polymorphism of the 16S rRNA genes corresponded to that of hrc RST genes, suggesting that these genes have followed a similar evolution. However, the occurrence of few mismatches suggests that sometimes TTSS-like genes might have undergone horizontal genetic transfer. |
| Databáze: | OpenAIRE |
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