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About P. syringae pv. syringae B728a


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whole plant infection infected bean pods infected leaves

Infection of bean with P. syringae pv. syringae (photos courtesy of Univ. of Idaho (field) and M.T. McGrath at Cornell Univ. (pod and leaf))

Additional information about the symptoms, disease cycle and control of P. syringae pv syringae can be found at the following sites:

CU Vegetable MD Online - Bacterial Diseases of Bean
UC Pest Management Guidelines - Dry Beans Bacterial Brown Spot
UM Extension Service - Edible Bean Disease

Strains of P. syringae are noted for their diverse and host-specific interactions with plants (2,3). Specific strains are assigned to one of the over 40 known pathovars, based on their ability infect different plant species.

P. syringae
pv. syringae strain B728a

  • Cause of bacterial brown spot of bean (7)
  • Highly fit colonist of bean with predominant leaf surface localization (7,8)
  • Active in ice nucleation at warm subfreezing temperatures (5,6)
  • Spontaneous rifampicin-resistant mutant of strain isolated from bean in Wisconsin (4)
  • No known race structure for this group

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. 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.

3. 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.

4. Loper, J.E. and S.E. Lindow. 1987. Lack of evidence for in situ fluorescent pigment production by Pseudomonas syringae pv. syringae on bean leaf surfaces. Phytopathology 77:1449-1454.

5. Lindow, S.E. 1993. Novel method for identifying bacterial mutants with reduced epiphytic fitness. Appl. Environ. Microbiol. 59:1586-1592.

6. Gurian-Sherman, D., and S.E. Lindow. 1993. Bacterial ice nucleation: significance and molecular basis. FASEB Journal 9:1338-1343.

7. Beattie, G.A., and S.E. Lindow. 1994. Comparison of the behavior of epiphytic fitness mutants of Pseudomonas syringae under controlled and field conditions. Appl. Environ. Microbiol. 60:3799-3808.

8. Wilson, M., S.S. Hirano, and S.E. Lindow. 1999. Location and survival of leaf-associated bacteria in relation to pathogenicity and potential for growth within the leaf. Appl. Environ. Microbiol. 65:1435-1443.