Abstract
The hrp gene cluster (for hypersensitive response and pathogenicity) is conserved in phytopathogenic prokaryotes and affects the ability of a bacterium to induce a hypersensitive response (HR) in nonhost plants, pathogenicity on host plants, and the ability to grow within or on the surface of plants (3, 4, 5, 6). A subset of the hrp genes was renamed hrc(HR and conserved) because of their conservation in the type III secretion apparatus used by Yersinia, Shigella, and Salmonella (4). The hrp genes have been extensively characterized in P. syringae where they are clustered in the chromosome and encode regulatory, secretory, or effector proteins (4).
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