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Applied and Environmental Microbiology, May 1999, p. 1904-1909, Vol. 65, No. 5
Departement de Biotechnologie, Centre de
Recherches Agronomiques de Gembloux, Ministère des Classes
Moyennes et de l'Agriculture, B-5030 Gembloux, Belgium
Received 16 November 1998/Accepted 14 February 1999
Toxin-based identification procedures are useful for
differentiating Pseudomonas syringae pathovars. A
biological test on peptone-glucose-NaCl agar in which the yeast
Rhodotorula pilimanae was used proved to be more reliable
for detecting lipodepsipeptide-producing strains of P. syringae than the more usual test on potato dextrose agar in
which Geotrichum candidum is used. A PCR test performed with primers designed to amplify a 1,040-bp fragment in the coding sequence of the syrD gene, which was assumed to be involved
in syringomycin and syringopeptin secretion, efficiently detected the
gene in pathovars that produce the lipodepsipeptides. Comparable results were obtained in both tests performed with strains of the
syringomycin-producing organisms P. syringae pv. syringae, P. syringae pv. atrofaciens, and P. syringae
pv. aptata, but the PCR test failed with a syringotoxin-producing
Pseudomonas fuscovaginae strain. The specificity of the
test was verified by obtaining negative PCR test results for related
pathovars or species that do not produce the toxic lipodepsipeptides.
P. syringae pv. syringae was detected repeatedly in liquid
medium inoculated with diseased vegetative tissue and assayed by the
PCR test. Our procedure was also adapted to detect P. syringae pv. morsprunorum with a cfl gene-based PCR test.
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Biological and Molecular Detection of Toxic
Lipodepsipeptide-Producing Pseudomonas syringae Strains
and PCR Identification in Plants
*
Corresponding author. Mailing address:
Département de Biotechnologie, Centre de Recherches Agronomiques
de Gembloux, 234 Chaussée de Charleroi, B-5030 Gembloux, Belgium.
Phone: (32) 81 61 29 35. Fax: (32) 81 61 04 59. E-mail:
bultreys{at}cragx.fgov.be.
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