Journal of Phytopathology - Phytopathologische Zeitschrift (1998) 146, 197-200

T. Oku, Y. Wakasaki, N. Adachi, C.I. Kado, K. Tsuchiya and T. Hibi (1998)
Pathogenicity, non-host hypersensitivity and host defence non-permissibility regulatory gene hrpX is highly conserved in Xanthomonas pathovars
Journal of Phytopathology - Phytopathologische Zeitschrift 146 (4), 197-200
Abstract: Xanthomonas campestris pv. campestris and X. oryzae pv, oryzae contain the 1428 base pair hrpX gene whose product is involved in the regulation oi hrp genes required for pathogericity, non-host hypersensitivity and non-permissibility of compatible host defence responses. Previous Southern blot hybridization studies have suggested that hrpX is conserved in several X. campestris pathovars and X. oryzae. strains. We have confirmed and extended these findings using hrpX gene amplification by polymerase chain reaction, coupled with Southern blot hybridization analyses. Sixteen distinct pathovars of X. campestris and 12 strains of X. oryzae pv, oryzae were shown to contain homologs of hrpX which were not apparent in heterologous bacteria such as Agrobacterium tumefaciens, A. rhizogenes, Erwinia carolovora ssp. carotovora, Pseudomonas syringae pv, glycinea. P. syringae pv, labaci, and Escherichia coli. The hrpX gene is therefore highly conserved among Xanthomonas species and its gene product strongly resembles positive regulatory proteins of the AraC protein family.
(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): Kenichi Tsuchiya

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xanthomonas oryzae
	Xanthomonas campestris pv. campestris
	Xanthomonas campestris