Abstract
Pseudomonas syringae isolates from symptom-free plants include both pathogenic strains belonging to different pathovars, as well as apparently nonpathogenic strains. The bacterium grows epiphytically on a vide variety of plants, not being restricted to only plants that functions as disease hosts. The population density reached has however been reported to be higher on plants that function as hosts for the particular pathovar (Hirano and Upper, 1990). Whether or not the reason for this is that epiphytically growing bacteria are better adapted for the surface of the disease host is an open question, it appears that P. syringae is an opportunistic pathogen that spends most of its time as a harmless epiphytic colonizer, rather than in an active virulent phase. However, the epiphytic population density of a specific pathogenic bacterium has been shown to correlate with the probability for disease outbreak (Rouse et al. 1985).
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Romantschuk, M., Roine, E., Björklöf, K. (1997). Attachment of Pseudomonas syringae to Plant Surfaces. In: Rudolph, K., Burr, T.J., Mansfield, J.W., Stead, D., Vivian, A., von Kietzell, J. (eds) Pseudomonas Syringae Pathovars and Related Pathogens. Developments in Plant Pathology, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5472-7_1
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