Xanthomonas campestris pv. raphani

Xanthomonas campestris pv. raphani
Scientific classification
Domain:	Bacteria
Phylum:	Pseudomonadota
Class:	Gammaproteobacteria
Order:	Xanthomonadales
Family:	Xanthomonadaceae
Genus:	Xanthomonas
Species:	X. campestris;
Pathovar:	X. c. pv. raphani
Trionomial name
	Xanthomonas campestris pv. raphani

Xanthomonas campestris pv. raphani is a gram-negative, obligate aerobic bacterium that like many other Xanthomonas spp. bacteria has been found associated with plants. This organism is closely related with Xanthomonas campestris pv. campestris, but causes a non-vascular leaf spot disease that is clearly distinct from black rot of brassicas.

Leaf spot diseases of brassicas were associated with X. campestris pv. armoraciae (McCulloch) Dye or X. campestris pv. raphani (White) Dye.^[1]^[2] The leaf spot isolates most commonly found in brassicas have been identified as X. campestris pv. raphani..^[3]

Hosts and symptoms

The host range of X. campestris pv. raphani is wider than X. campestris pv. campestris and includes Brassica spp., radish, ornamental crucifers like wallflowers and tomato.

Symptoms include circular dark spots that later became light brown or gray, sometimes surrounded by a water-soaked halo. In severely infections, the spots can coalesce and become irregular, but not limited by the veins. Symptoms also include black, sunken, elongated lesions on the middle vein, petiole, and/or stem.^[3]^[2]

Significance

This pathovar causes a minor disease in brassica crops; it can be occasionally isolated from seeds.

References

^ McCulloch, L. (1929). "A bacterial leaf spot of horseradish caused by Bacterium campestris var. armoraciae, n. var". Journal of Agricultural Research. 38: 269–287.
^ ^a ^b White, H.E. (1930). "Bacterial spot of radish and turnip". Phytopathology. 20: 653–662.
^ ^a ^b Vicente, J. G.; Everett, B.; Roberts, S. J. (July 2006). "Identification of Isolates that Cause a Leaf Spot Disease of Brassicas as Xanthomonas campestris pv. raphani and Pathogenic and Genetic Comparison with Related Pathovars". Phytopathology. 96 (7): 735–745. doi:10.1094/PHYTO-96-0735. ISSN 0031-949X. PMID 18943147.

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[1] McCulloch, L. (1929). "A bacterial leaf spot of horseradish caused by Bacterium campestris var. armoraciae, n. var". Journal of Agricultural Research. 38: 269–287.

[:1-2] White, H.E. (1930). "Bacterial spot of radish and turnip". Phytopathology. 20: 653–662.

[:0-3] Vicente, J. G.; Everett, B.; Roberts, S. J. (July 2006). "Identification of Isolates that Cause a Leaf Spot Disease of Brassicas as Xanthomonas campestris pv. raphani and Pathogenic and Genetic Comparison with Related Pathovars". Phytopathology. 96 (7): 735–745. doi:10.1094/PHYTO-96-0735. ISSN 0031-949X. PMID 18943147.

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