The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Identification and Characterization of Pseudomonas syringae pv. syringae, a Causative Bacterium of Apple Canker in Korea

  • Seunghee, Lee (Department of Plant Medicals, Andong National University) ;
  • Wonsu, Cheon (Department of Plant Medicals, Andong National University) ;
  • Hyeok Tae, Kwon (Department of Plant Medicals, Andong National University) ;
  • Younmi, Lee (Department of Plant Medicals, Andong National University) ;
  • Jungyeon, Kim (Department of Plant Medicals, Andong National University) ;
  • Kotnala, Balaraju (Agricultural Science & Technology Research Institute, Andong National University) ;
  • Yongho, Jeon (Department of Plant Medicals, Andong National University)
  • Received : 2022.08.30
  • Accepted : 2022.12.19
  • Published : 2023.02.01
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Abstract

In the present investigation, bacterial isolates from infected apple trees causing apple canker during winter were studied in the northern Gyeongbuk Province, Korea. The pathogen was identified as Pseudomonas syringae pv. syringae (Pss) through various physiological and biochemical characterization assays such as BIOLOG, gas chromatography of fatty acid methyl esters, and 16S rRNA. Bioassays for the production of phytotoxins were positive for syringopeptin and syringomycin against Bacillus megaterium and Geotrichum candidum, respectively. The polymerase chain reaction (PCR) method enabled the detection of toxin-producing genes, syrB1, and sypB in Pss. The differentiation of strains was performed using LOPAT and GATTa tests. Pss further exhibited ice nucleation activity (INA) at a temperature of -0.7℃, indicating an INA+ bacterium. The ice-nucleating temperature was -4.7℃ for a non-treated control (sterilized distilled water), whereas it was -9.6℃ for an INA- bacterium Escherichia coli TOP10. These methods detected pathogenic strains from apple orchards. Pss might exist in an apple tree during ice injury, and it secretes a toxin that makes leaves yellow and cause canker symptoms. Until now, Korea has not developed antibiotics targeting Pss. Therefore, it is necessary to develop effective disease control to combat Pss in apple orchards. Pathogenicity test on apple leaves and stems showed canker symptoms. The pathogenic bacterium was re-isolated from symptomatic plant tissue and confirmed as original isolates by 16S rRNA. Repetitive element sequence-based PCR and enterobacterial repetitive intergenic consensus PCR primers revealed different genetic profiles within P. syringae pathovars. High antibiotic susceptibility results showed the misreading of mRNA caused by streptomycin and oxytetracycline.

Keywords

Acknowledgement

This work was supported by a grant from research fund of Andong National University.

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