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KMID : 0364820140500030245
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Korean Journal of Microbiology
2014 Volume.50 No. 3 p.245 ~ p.248
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Phenotypic Characteristics of Pseudomonas syringae pv. actinidiae Strains from Different Geographic Origins
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Choi Eun-Jin
Lee Young-Sun
Kim Gyoung-Hee
Koh Young-Jin
Jung Jae-Sung
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Abstract
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Pseudomonas syringae pv. actinidiae is the causal agent of bacterial canker in kiwifruit (genus Actinidia).
Multilocus sequence analysis of seven housekeeping and 11 type III effector genes differentiated the virulent P.
syringae pv. actinidiae isolates worldwide into three groups designated as Psa1-Psa3. In this work, a total of 12 P.
syringae pv. Actinidiae strains, including three Psa1, three Psa2, three Psa3 strains isolated from Korea and three
Psa3 strains from Italy, were compared based on their phenotypic properties. Strains with different geographic
origins had unique growth patterns as demonstrated by growth rate at several temperatures; all tested strains
exhibited maximum growth at temperatures below 22℃, while the growth of Psa3 strains was completely inhibited
above 30℃. Psa3 strains isolated from Korea had longer lag phases than the Psa3 strains from Italy. The Psa2 strains
were different from Psa1 and Psa3 strains in the API 20NE test, in which the Psa2 strains could not utilize potassium
gluconate, capric acid and trisodium citrate. Psa3 strains isolated from Korea could hydrolyze esculin. The API
ZYM test showed that β-glucosidase activity was detected only from Psa3 strains. The strains belonging to the three
Psa groups differed with regard to their susceptibility to ampicillin, novobiocin, and oleandomycin.
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KEYWORD
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Pseudomonas syringae pv. actinidiae, bacterial canker, kiwifruit, phenotype
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