Phenotypic and Genetic Diversity of Selected Erwinia Amylovora Strains from Poland (original) (raw)
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Phenotypic Diversity of Erwinia amylovora in Bulgaria
Zeitschrift für Naturforschung C, 2007
Fifty-one strains of Erwinia amylovora isolated from nine host plants in Bulgaria were characterized phenotypically and identified by the API 20E and BIOLOG system. The identification was confirmed by PCR amplification of a specific region of the plasmid pEA29 and the genome ams region. The phenotypic diversity of the strains was studied on the basis of their API 20E and BIOLOG metabolic profiles, as well as of their SDS-PAGE protein profile. Metabolic diversity among the strains was established, but no connection with the origin of the strains was revealed. The Bulgarian strains showed API 20E metabolic profiles not found in previous studies of E. amylovora. The strains formed a homogenous group on the basis of their protein profiles. All the strains were sensitive to the antibiotics streptomycin, tetracycline and oxytetracycline. This study was an initial step towards an investigation of the diversity and evolution in the Bulgarian population of E. amylovora, and it was the first ...
Characterization of Erwinia amylovora Strains from Croatia
European Journal of Plant Pathology, 2006
Erwinia amylovora is the causative agent of fire blight, a destructive disease of rosaceous plants. The European population can be divided into several subtypes according to differences in restriction fragment length polymorphism of the XbaI genomic DNA digest analysed with pulsed-field gel electrophoresis. This technique was also used to determine the genetic relatedness of six Croatian isolates to the E. amylovora types found in the countries surrounding Croatia. The isolates belong to the Pt2 pattern type that is characteristic of the East Mediterranean basin. All tested isolates gave essentially the same total cell protein pattern in SDS-polyacrylamide gel electrophoresis. The number of short-sequence DNA repeats in plasmid pEA29 of six isolates was determined by PCR assays and ranged from four to seven. The isolates examined showed high pathogenicity in immature pear fruits. Differences were also revealed in microbiological assays such as amylovoran synthesis, levan formation, siderophore production and colour on coliform medium. Recently, E. amylovora isolates have been characterized by assaying restriction fragment length polymorphism (RFLP) of their genomic DNA, using pulsed-field gel electrophoresis (PFGE)
Journal of Plant Pathology, 2017
In the period from 2012-2015 plant samples with fireblight symptoms were collected from pome fruit and indigenous plant, in main fruitgrowing regions of Montenegro. After succesfull isolation, pathogenicity of the obtained strains was tested by artificial inoculation of immature pear fruits, variety Viljamovka. Hypersensitive reaction was tested on tobacco leaves, variety White Burley. Identification and genetic diversity studies were performed using several molecular techniques on 18 Erwinia amylovora strains originating from quince, pear, apple and hawthorn. Bacterial identity was confirmed by nested PCR in which all studied strains produced the expected amplification fragment of plasmid pEA29. To detect potential genetic variations in E. amylovora population, rep-PCR was conducted. Using REP, ERIC and BOX primers, in all three PCR reactions, differences between studied strains were detected, i.e. pear strains had different genetic profiles from all other studied strains, includin...
Comparative Genomics of Erwinia Amylovora Isolates from Mexico
Acta horticulturae, 2014
Isolates of Erwinia amylovora from Mexico were collected and tested for their resistance to antibiotics used in orchards. Isolates with resistance to streptomycin were found, but no resistance to the commonly used antibiotics tetracycline and gentamicin was detected. The genomes of three isolates were sequenced and compared to reference genomes. The streptomycin resistance of two isolates was due to the common K43R mutation in rpsL. Analysis of the genomes revealed that the strains belong to CRISPR group I, which is common with strains from the Northeastern region of the USA and that each strain has a mutation in avrRpt2, which is present in strains that are able to overcome the resistance of Malus × robusta 5.
Genetic characterization of Erwinia amylovora strains by amplified fragment length polymorphism
Journal of Applied Microbiology, 2004
Aims: Erwinia amylovora is one of the most important pathogens of pear and apple and is subject to strict quarantine regulations worldwide, although its patterns of dispersal are largely unknown. Previous attempts to fingerprint E. amylovora strains by molecular techniques have detected very little polymorphism because of the high genetic homogeneity of this bacterium. Our aim was to establish and test a typing method to quantify genetic diversity among strains of this plant pathogen. Methods and Results: Twenty-two strains from different hosts and geographical locations were examined by PCR fingerprinting with four primers and by amplified fragment length polymorphism (AFLP) with four selected combinations of primers with a single base extension. PCR fingerprinting revealed little polymorphism producing the same amplification patterns for 17 strains, while the combined AFLP patterns yielded 78 polymorphic bands (34% of total bands) and allowed the differentiation of all but two strains. Clustering of strains in the resulting dendrogram was not correlated with host, year or country of isolation, and questions previous genealogies based on PFGE patterns. Conclusions: The AFLP technique allowed the detection of an unprecedented number of genetic markers in E. amylovora and proved to be the most useful tool so far for discriminating among strains of this pathogen. The results obtained in this study strongly suggest the occurrence of multiple introductions of the pathogen in Spain and other European countries. Significance and Impact of the Study: A major limitation in understanding the ecology of fire blight is the lack of typing techniques with a high power of discrimination. This study demonstrates the high resolution and the usefulness of the AFLP technique to differentiate among E. amylovora strains.