2023(4)      October - December, 2023

The reliability of catechol 1,2-dioxygenase enzyme as detection factor of Pseudomonas savastanoi pv. savastanoi strains isolated from different olive growing areas in Jordan by PCR-RFLP

Bilal Ibrahim Wreikat*

Department of Plant Production and Protection, Faculty of Agricultural Technology, Al-Balqa Applied University, Al-Salt, Jordan


The virulence gene Catechol 1,2-dioxygenase was detected in different isolates of Pseudomonas savastanoi pv. savastanoi (Smith, 1908), through amplification of 857 bp band by Polymerase Chain Reaction, it was confirmed in all isolates that were isolated from different olive cultivars growing in different areas in Jordan. Also, digestion of the amplified PCR product of this gene for all isolates of the pathogen, using Polymerase Chain Reaction Restriction-Fragments Length Polymorphism (PCR-RFLP), it was found that the catA gene is highly conserved for all isolates, after digestion with KpnI and BamHI Endonucleases. Further identification was performed for all isolates; by biochemical tests and pathogenicity on olive seedlings, and detection the virulence gene iaaL through PCR amplification of 454bp in all isolates. Interestingly, this study revealed that detection and identification of Pseudomonas savastanoi pv. savastanoi by catA gene is reliable and certified and will give further prospects in management between olive knot through crosstalk of olive plant and their knot bacterium.

Keywords: Olive Knot, Pseudomonas savastanoi, Catechol dioxygenase, Virulence factor

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