Additional information about the symptoms, disease cycle and
control of P. syringae pv tomato can be found
at the following sites:
CU Vegetable
MD Online - Bacterial
Disease of Tomato
UC Pest Management Guidelines - Tomato
Bacterial Speck
KSU Research and Extension - Bacterial
Speck
UF Cooperative Extension - Bacterial
Speck of Tomato
NDSU Extension Service - Bacterial
Spot and Bacterial Speck of Tomato
Strains
of P. syringae are noted for their diverse and host-specific
interactions with plants (4,6). Specific strains are assigned
to one of the over 40 known pathovars, based on their
ability infect different plant species. They are then further
assigned to a race based on differential interactions
among cultivars of the host.
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Literature cited:
1. Alfano,
J. R., and A. Collmer. 1996. Bacterial pathogens in plants:
Life up against the wall. Plant Cell 8:1683-1698.
2. Cuppels,
D. A. 1986. Generation and characterization of Tn5 insertion
mutations in Pseudomonas syringae pv. tomato. Appl. Environ.
Microbiol. 51:323-327.
3. Hendson,
M., D. C. Hildebrand, and M. N. Schroth. 1992. Relatedness
of Pseudomonas syringae pv. tomato, Pseudomonas syringae pv.
maculicola and Pseudomonas syringae pv. antirrhini. J. Appl.
Bacteriol. 73:455-464.
4. Hirano,
S. S., and C. D. Upper. 2000. Bacteria in the leaf ecosystem
with emphasis on Pseudomonas syringae-a pathogen, ice nucleus,
and epiphyte. Microbiol. Mol. Biol. Rev. 64:624-653.
5. Ronald,
P. C., J. M. Salmeron, F. M. Carland, and B. J. Staskawicz.
1992. The cloned avirulence gene avrPto induces disease resistance
in tomato cultivars containing the Pto resistance gene. J.
Bacteriol. 174:1604-1611.
6. Rudolph,
K., T. J. Burr, J. W. Mansfield, D. Stead, A. Vivian, and
J. von Kietzell. 1997. Pseudomonas syringae Pathovars and
Related Pathogens. Kluwer, Dordrecht.
7. Whalen,
M. C., R. W. Innes, A. F. Bent, and B. J. Staskawicz. 1991.
Identification of Pseudomonas syringae pathogens of Arabidopsis
and a bacterial locus determining avirulence on both Arabidopsis
and soybean. Plant Cell 3:49-59.
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