Abstract
The pathogenicity and host range of Pseudomonas syringae strains are controlled by hrp genes. The hrp gene cluster contains at least 26 genes organized as 8 apparent transcriptional units. Expression of the hrp transcriptional units is coordinated by a regulatory system requiring hrpR, hrpS and hrpL. The properties and activities of these gene products are discussed. Coregulated with the hrp genes are a set of host range determinants known as avirulence genes. Evidence supporting the interaction of hrp and avr genes to controi host range of P. syringae strains is presented. The results indicate that phenotypic expression of avr genes in P. syringae strains is mediated via the secretion activities encoded by the hrp gene cluster.
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