title: Activation of defense responses in Chinese cabbage by a nonhost pathogen, Pseudomonas syringae pv. tomato.
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.
authors.affiliation: Division of Life Sciences, Chungbuk National University, Cheongju 361-763, Korea.
authors.forename: Yong-Soon
authors.initials: YS
authors.lastname: Park
authors.forename: Myeong Hoon
authors.initials: MH
authors.lastname: Jeon
authors.forename: Sung-Hee
authors.initials: SH
authors.lastname: Lee
authors.forename: Jee Sook
authors.initials: JS
authors.lastname: Moon
authors.forename: Jae-Soon
authors.initials: JS
authors.lastname: Cha
authors.forename: Hak Yong
authors.initials: HY
authors.lastname: Kim
authors.forename: Tae-Ju
authors.initials: TJ
authors.lastname: Cho
mesh_terms: D000085:Acetates / Q000494:pharmacology; D015152:Blotting, Northern; D001937:Brassica / Q000382:microbiology*; D016923:Cell Death; D003517:Cyclopentanes / Q000494:pharmacology; D005030:Ethylenes / Q000494:pharmacology; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008957:Models, Genetic; D054883:Oxylipins / Q000494:pharmacology; D010935:Plant Diseases / Q000382:microbiology; D018515:Plant Leaves / Q000382:microbiology; D044224:Pseudomonas syringae / Q000378:metabolism*; D020156:Salicylic Acid / Q000494:pharmacology; D013997:Time Factors
chemical_list: D000085:Acetates; D003517:Cyclopentanes; D005030:Ethylenes; D054883:Oxylipins; C072239:methyl jasmonate; C036216:ethylene; D006861:Hydrogen Peroxide; D020156:Salicylic Acid