Identification and structure of a family of syringolin variants: Unusual cyclic peptides from Pseudomonas syringae pv. syringae that elicit defense responses in rice
U. Waspi et al., Identification and structure of a family of syringolin variants: Unusual cyclic peptides from Pseudomonas syringae pv. syringae that elicit defense responses in rice, MICROBI RES, 154(1), 1999, pp. 89-93
Pseudomonas syringae pv. syringae is recognized by the non-host plant Oryza
sativa which reacts with defense responses leading to induced resistance t
owards the rice blast fungus Pyricularia oryzae. We have previously shown t
hat syringolin, a novel and unusual peptide secreted by P. syringae pv. syr
ingae under appropriate conditions, is one of the molecular determinants by
which rice plants can perceive the non-host pathogen. Here we show that sy
ringolin is a member of a family of related compounds. We have isolated syr
ingolin variants B to F and determined their structure using mass and NMR s
pectroscopic methods. These variants, which differ from each other by vario
us modifications, are all able to induce defense responses upon application
onto rice leaves.