External pH: An Environmental Signal That Helps to Rationalize pel Gene Duplication in Erwinia chrysanthemi
The phytopathogenic bacterium Erwinia chrysanthemi produces five major Art by Venue pectate lyases that are key virulence factors in soft-rot disease development.Using transcriptional fusions, we studied the regulation of pelA, pelD, and pelE gene expression as a function of variation of the external pH.pelA and pelD were expressed when bacteria we