Pseudomonas syringae

Pseudomonas syringae is rod-shaped, Gram negative bacterium. It is a plant pathogen. The bacterium can cause disease in many different plants. There are many variants, called pathovars. They are specialized to infect different plants.

Pseudomonas syringae
Cultures of Pseudomonas syringae
Scientific classification
Domain:	Bacteria
Phylum:	Pseudomonadota
Class:	Gammaproteobacteria
Order:	Pseudomonadales
Family:	Pseudomonadaceae
Genus:	Pseudomonas
Species:	P. syringae
Binomial name
Pseudomonas syringae Van Hall, 1904
Type strain
ATCC 19310 CCUG 14279 CFBP 1392 CIP 106698 ICMP 3023 LMG 1247 NCAIM B.01398 NCPPB 281 NRRL B-1631
Pathovars
P. s. pv. aceris P. s. pv. aptata P. s. pv. atrofaciens P. s. pv. dysoxylis P. s. pv. japonica P. s. pv. lapsa P. s. pv. panici P. s. pv. papulans P. s. pv. persicae (Prunier, Luisetti &. Gardan) Young, Dye & Wilkie[1] P. s. pv. pisi P. s. pv. syringae P. s. pv. morsprunorum

The bacterium can live as an epiphyte on the plant surface. It only causes disease once it is able to enter the plant cells. The bacterium enters the plant via wounds or natural openings like stomata. Once inside the plant tissues the bacteria multiply and cause leaf spots and cankers.

Examples of diseases caused by Pseudomonas syringae (P. s) include

• P. s. pv. aesculi attacks horse chestnut trees causing horse chestnut bleeding canker^[2]
• P. s. pv. glycinea attacks soybean Glycine max, causing bacterial blight of soybean.^[3]
• P. s. pv. phaseolicola causes halo blight of beans.
• P. s. pv. syringae attacks cherry and plum causing bacterial canker.^[4]

This bacterium has been well studied as it is a useful model organism^[5] as well as an economically important plant pathogen.

References

1. "Pseudomonas syringae pv. persicae (PSDMPE)[Overview]". Global Database. EPPO (European and Mediterranean Plant Protection Organization). 2001-01-28. Retrieved 2022-03-22.
2. "Bleeding canker of horse chestnut: Symptoms". Forest Research. Retrieved 2023-09-22.
3. Bennett, J. Michael; Hicks, Dale R.; Naeve, Seth L.; Bennett, Nancy Bush (2014). The Minnesota Soybean Field Book (PDF). St Paul, MN: University of Minnesota Extension. p. 84. Archived from the original (PDF) on 30 September 2013. Retrieved 21 February 2016.
4. "Bacterial canker / RHS Gardening". www.rhs.org.uk. Retrieved 2023-09-22.
5. Xin, Xiu-Fang; Kvitko, Brian; He, Sheng Yang (May 2018). "Pseudomonas syringae: what it takes to be a pathogen". Nature Reviews Microbiology. 16 (5): 316–328. doi:10.1038/nrmicro.2018.17. ISSN 1740-1534.