Race-specific interaction between the Brassicaplants and Xanthomonas campestris pv.campestris bacteria follows the “gene-for-gene” rule. Expression of the avirulence genes recognized by two dominant resistance genes of Brassica, Rxc1 in plants with the BB genome, and Rxc3in theCC plants, was lost after bacterial mutation in planta. The mutation was caused by the elongation of CGCGC pentanucleotide repeat in the gene, which was designated as avrRxc1/3. This gene displayed strong structural similarity to the avrBs2 locus from the related species X. vesicatoria. Thus, it is the first description of theavrRxc1/3 avirulence gene conferring race-specific interaction betweenX. campestris pv. campestrisand Brassicaplants. Structural homologues of the avrBs2 are found in many Xanthomonas species, but in all cases except X. vesicatoria, their function was previously unknown.
Russian Journal of Genetics – Springer Journals
Published: Oct 13, 2004
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