1887

Abstract

The , and genes of pv. are essential for ferric iron uptake. In contrast, the gene located in the same gene cluster is not essential. Mutational analysis revealed that the ferric-iron-uptake genes , and are necessary for the induction of a hypersensitive response (HR) on the nonhost plant pepper () and the induction of typical black rot symptoms on the host plant cauliflower (). Again, the gene behaved differently. It was found to play a role only in the induction of the HR in pepper but not in the induction of black rot symptoms in cauliflower. Due to the low iron concentration in the plant tissue, the titre of viable bacteria of the ferric-iron-uptake mutants , and decreased after leaf infiltration of pepper. The mutant, however, which is not impaired in ferric iron uptake, multiplied in the pepper leaf tissue and grew even better than the wild-type strain, probably due to its failure to induce the HR. Nevertheless, the , and mutant strains were able to spread systemically in cauliflower.

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2000-05-01
2019-12-09
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