A microbially derived tyrosine‐sulfated peptide mimics a plant peptide hormone

• DOI: 10.1111/nph.14609
• Publication Date: 2017-05-30T09:42:08Z
• Authors: Rory N. Pruitt; Anna Joe; Weiguo Zhang; Wei Feng; Valley Stewart; Benjamin Schwessi...; José R. Dinneny; Pamela C. Ronald
• Keywords: Xanthomonas; Plant hormone

The biotrophic pathogen Xanthomonas oryzae pv. (Xoo) produces a sulfated peptide named RaxX, which shares similarity to peptides in the PSY (plant containing tyrosine) family. We hypothesize that RaxX mimics growth-stimulating activity of peptides. Root length was measured Arabidopsis and rice treated with synthetic also used comparative genomic analyses reactive oxygen species burst assays evaluate Here we found derivative comprising 13 residues (RaxX13-sY), highly conserved between PSY, induces root growth manner similar triggered by PSY. identified are required for activation immunity mediated XA21 receptor but not essential induced Finally, showed strain lacking raxX is impaired virulence. These findings suggest serves as molecular mimic facilitate Xoo infection has evolved ability recognize respond specifically microbial form peptide.