Ten Rice Peroxidases Redundantly Respond to Multiple Stresses Including Infection with Rice Blast Fungus
| Autor: | Takayoshi Iwai, Ichiro Mitsuhara, Susumu Hiraga, Yuko Ohashi, Katsutomo Sasaki, Shigemi Seo, Hiroyuki Ito, Atsushi Miyasaka, Hirokazu Matsui, Katsushi Kuroda, Masataka Iwano |
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| Rok vydání: | 2004 |
| Předmět: |
Antifungal Agents
Physiology viruses Amino Acids Cyclic Cyclopentanes Plant Science Fungus Plant disease resistance Gene Expression Regulation Enzymologic Microbiology chemistry.chemical_compound Plant Growth Regulators Gene Expression Regulation Plant Botany Reaction Time Oxylipins Pathogen Gene Phylogeny Plant Diseases Plant Proteins Sequence Homology Amino Acid biology Host (biology) Jasmonic acid virus diseases Oryza Cell Biology General Medicine biology.organism_classification Immunity Innate Up-Regulation Isoenzymes Magnaporthe Peroxidases chemistry Function (biology) Salicylic acid |
| Zdroj: | Plant and Cell Physiology. 45:1442-1452 |
| ISSN: | 1471-9053 0032-0781 |
| DOI: | 10.1093/pcp/pch165 |
| Popis: | Class III plant peroxidases are believed to function in diverse physiological processes including disease resistance and wound response, but predicted low substrate specificities and the presence of 70 or more isoforms have made it difficult to define a specific physiological function(s) for each gene. To select pathogen-responsive POX genes, we analyzed the expression profiles of 22 rice POX genes after infection with rice blast fungus. The expression of 10 POX genes among the 22 genes was induced after fungal inoculation in both compatible and incompatible hosts. Seven of the 10 POX genes were expressed at higher levels in the incompatible host than in the compatible host 6-24 h after inoculation by which time no fungus-induced lesions have appeared. Organ-specific expression and stress-induced expression by wounding and treatment with probenazole, an agrichemical against blast fungus, jasmonic acid, salicylic acid and 1-aminocyclopropane-1-carboxylate, a precursor of ethylene, indicated that rice POXs have individual characteristics and can be classified into several types. A comparison of the amino acid sequences of POXs showed that multiple isoforms with a high sequence similarity respond to stress in different or similar ways. Such redundant responses of POX genes may guarantee POX activities that are necessary for self-defense in plant tissues against environmental stresses including pathogen infection. |
| Databáze: | OpenAIRE |
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