Abstract

Xanthomonas campestris pathovar campestris (hereafter X.c. campestris), the causal agent of black rot of crucifers, is a phytopathogenic bacterium of great economic importance (WILLIAMS 1980; ONSANDO 1992; SCHAAD and ALVAREZ 1993). Molecular genetic methods have now allowed a number of genes encoding pathogenicity determinants of X.c. campestris and related pathovars to be identified. In this chapter we will briefly review some of these and discuss our current understanding of the regulation of pathogenicity in this bacterium.

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