Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 5/5/2004
Publication Date: 8/20/2004
Citation: Bull, C.T., Goldman, P.H., Morris, N.C., Koike, S.T., Kobayashi, D.Y. Expanded host and geographic range of pseudomonas syringae pv. alisalensis. Phytopathology. 2004. v. 94. p. S12.
Technical Abstract: Pseudomonas syringae pv. alisalensis is an emerging pathogen that causes bacterial blight on crucifers in California. In 1995 a bacterial disease of arugula (Eruca sativa) in California was reported to be caused by P. syringae pv. maculicola and a similar disease was observed in New Jersey. Further characterization of pathogens from both locations indicated they were P. syringae pv. alisalensis. REP-PCR banding patterns of the arugula isolates were identical to those of P. syringae pv. alisalensis but distinct from P. syringae pv. maculicola patterns. Additionally, a bacteriophage isolated using P. syringae pv. alisalensis as a host lysed the arugula strains but not P. syringae pv. maculicola strains. Although these data indicate that the pathogens from arugula were P. syringae pv. alisalensis, additional host range studies are in progress to confirm this conclusion. While all the P. syringae pv. alisalensis strains from rappini and broccoli tested to date were positive for ice nucleation; the strains from arugula were negative. These data expand the geographic and host range of P. syringae pv. alisalensis which currently is known to be pathogenic on other crucifers and monocots and indicate that this pathogen is variable for ice nucleation.