Isolation and Molecular Characterization of the Fire Blight Pathogen, Erwinia amylovora, Isolated from Apple and Pear Orchards in Egypt

Eleven Erwinia amylovora isolates, the causal agent of the fire blight disease, were isolated from apple orchards adjacent to those of pears showing fire blight disease symptoms. Initial characterization concerning morphological and biochemical traits revealed that all isolates were typical to those...

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Veröffentlicht in:Plant pathology journal 2015-06, Vol.14 (3), p.142-147
Hauptverfasser: Ashmawy, Nader A, Zaghloul, Taha I, El-Sabagh, Moustafa A
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Sprache:eng
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Zusammenfassung:Eleven Erwinia amylovora isolates, the causal agent of the fire blight disease, were isolated from apple orchards adjacent to those of pears showing fire blight disease symptoms. Initial characterization concerning morphological and biochemical traits revealed that all isolates were typical to those of E. amylovora. Furthermore, all bacterial isolates showed typical symptoms of the fire blight disease upon infection of unripe pear fruits. Molecular characterization of these isolates via PCR utilizing specific primers based on a region of plasmid pEA29 and chromosomal DNA ams-region was performed. PCR products were positive and represented the expected length 1.1 and 1.6 kb, respectively. Moreover, PCR reactions utilizing the 16S rRNA universal primers were carried out. DNA sequence of PCR products and analysis via blast and Genbank data showed that, the bacterial isolates actually belonging to E. amylovora. To the best of the authors' knowledge, this is the first report of fire blight of apples caused by E. amylovora in Egypt.
ISSN:1812-5387
1812-5425
DOI:10.3923/ppj.2015.142.147