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  • Title: Activation of defense responses in Chinese cabbage by a nonhost pathogen, Pseudomonas syringae pv. tomato.
    Author: Park YS, Jeon MH, Lee SH, Moon JS, Cha JS, Kim HY, Cho TJ.
    Journal: J Biochem Mol Biol; 2005 Nov 30; 38(6):748-54. PubMed ID: 16336791.
    Abstract:
    Pseudomonas syringae pv. tomato (Pst) causes a bacterial speck disease in tomato and Arabidopsis. In Chinese cabbage, in which host-pathogen interactions are not well understood, Pst does not cause disease but rather elicits a hypersensitive response. Pst induces localized cell death and H2O2 accumulation, a typical hypersensitive response, in infiltrated cabbage leaves. Pre-inoculation with Pst was found to induce resistance to Erwinia carotovora subsp. carotovora, a pathogen that causes soft rot disease in Chinese cabbage. An examination of the expression profiles of 12 previously identified Pst-inducible genes revealed that the majority of these genes were activated by salicylic acid or BTH; however, expressions of the genes encoding PR4 and a class IV chitinase were induced by ethephon, an ethylene-releasing compound, but not by salicylic acid, BTH, or methyl jasmonate. This implies that Pst activates both salicylate-dependent and salicylate-independent defense responses in Chinese cabbage.
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