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Plant and Cell Physiology 2004 45(10):1442-1452; doi:10.1093/pcp/pch165
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© 2004 Oxford University Press

Ten Rice Peroxidases Redundantly Respond to Multiple Stresses Including Infection with Rice Blast Fungus

Katsutomo Sasaki1,2,5, Takayoshi Iwai3, Susumu Hiraga4, Katsushi Kuroda2,5, Shigemi Seo2,5, Ichiro Mitsuhara2,5, Atsushi Miyasaka4, Masataka Iwano4, Hiroyuki Ito1, Hirokazu Matsui1 and Yuko Ohashi2,5,6

1 Department of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo, 060-8589 Japan
2 National Institute of Agrobiological Sciences (NIAS), Kannon-dai, Tsukuba, Ibaraki, 305-8602 Japan
3 Miyagi Prefectural and Horticulture Research Center, Takedate-kawakami, Natori, Miyagi, 981-1243 Japan
4 National Agriculture Research Organization (NARO), Kannon-dai, Tsukuba, Ibaraki, 305-8518 Japan
5 Program for Promotion of Basic Research Activities for Innovative Bioscience (PROBRAIN), Minato-ku, Tokyo 105-0001, Japan

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.

6 Corresponding author: E-mail, yohashi{at}affrc.go.jp; Fax: +81-298-38-7469.


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