Plant Pathology (2019) 68, 977-984

N. Eckshtain-Levi, M. Lindeberg, G.E. Vallad and G.B. Martin (2019)
The tomato Pto gene confers resistance to Pseudomonas floridensis, an emergent plant pathogen with just nine type III effectors
Plant Pathology 68 (5), 977-984
Abstract: A newly discovered bacterial species, Pseudomonas floridensis, has emerged as a pathogen of tomato in Florida. This study compares the virulence and other attributes of P. floridensis to Pseudomonas syringae pv. tomato, which causes bacterial speck disease of tomato. Pseudomonas floridensis reached lower population levels in leaves of tomato as compared to the P. syringae pv. tomato strains DC3000 and NYT1. Analysis of the genome sequence of the P. floridensis type strain GEV388 revealed that it has just nine type III effectors including AvrPtoB_GEV388, which is 66% identical to AvrPtoB in DC3000. Five of these effectors have been previously reported to be members of a 'minimal effector repertoire' required for full DC3000 virulence on Nicotiana benthamiana; however, GEV388 grew poorly on leaves of this plant species compared to the DC3000 minimal effector strain. The tomato Pto gene recognizes AvrPtoB in race 0 P. syringae pv. tomato strains, thereby conferring resistance to bacterial speck disease. Pto was also found to confer resistance to P. floridensis, indicating this gene will be useful in the protection of tomato against this newly emerged pathogen.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Gary E. Vallad

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pseudomonas floridensis	Tomato (Solanum lycopersicum)	U.S.A. (SE)