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- Title
Involvement of Hydrogen Peroxide in Repression of Catalase in TMV-infected Resistant Tobacco.
- Authors
Yi, So-Young; Yu, Seung-Hun; Choi, Doil
- Abstract
Catalases are ubiquitous, and play a role in plant delense against pathogens. We have reported that catalase mRNA and enzyme activity are repressed in the vicinity of hypersensitive tobacco lesions following TMV infection. We wished to identify the signals involved in this repression. Inoculation with TMV reduced catalase levels 26 to 28 h following infection coincident with the known timing of endogenous salicylic acid (SA) accumulation. Application of SA caused a transient reduction in Ngcat I mRNA level and catalase activity 4 to 6 h after treatment, However. repression was also observed in transgenic plants harboring the salicylate hydroxylase gene (NahG) and in TMV susceptible plants, which do not accumulate SA following TMV infection. In the. same blots there was no induction of PR-I or enhanced expression of H[sub 2]O[sub 2]-inducible glutathione-S-transferase and found that exposure to H[sub 2]O[sub 2] also repressed Ngcat I mRNA. Our findings suggest thai repression of catalase transcription may be caused by the accumulation of H[sub 2]O[sub 2] rather than of SA.
- Subjects
ENZYMES; MESSENGER RNA; PATHOGENIC microorganisms; TOBACCO; GENES
- Publication
Molecules & Cells (Springer Nature), 2003, Vol 15, Issue 3, p364
- ISSN
1016-8478
- Publication type
Article
- DOI
10.1016/s1016-8478(23)13751-4