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Plant and Cell Physiology, 2003, Vol. 44, No. 12 1301-1310
© 2003 Oxford University Press

Isolation of an Ozone-Sensitive and Jasmonate-Semi-Insensitive Arabidopsis Mutant (oji1)

Machi Kanna1,2, Masanori Tamaoki3, Akihiro Kubo2, Nobuyoshi Nakajima3, Randeep Rakwal4,5, Ganesh Kumar Agrawal5, Shigeru Tamogami6, Motohide Ioki3,7, Daisuke Ogawa3,8, Hikaru Saji2 and Mitsuko Aono1,2,9

1 Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, 226-8501 Japan
2 Environmental Biology Division, National Institute for Environmental Studies, Tsukuba, 305-8506 Japan
3 Biodiversity Conservation Research Project, National Institute for Environmental Studies, Tsukuba, 305-8506 Japan
4 National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8566, Japan
5 Bio-Resource Research and Development Company Pvt. Ltd. (BIRD), Kathmandu, GPO Box 8207, Nepal
6 Laboratory of Growth Regulation Chemistry, Department of Biological Production, Akita Prefectural University, Akita, 010-0195 Japan
7 Graduate School of Science, The University of Tokyo, Tokyo, 113-0033 Japan
8 Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, 305-8572 Japan

A novel ozone-sensitive mutant was isolated from Arabidopsis T-DNA tagging lines. This mutant revealed severe foliar injury and higher ethylene emission than the wild type under ozone exposure. The ozone-induced injury and ethylene emission were suppressed by pretreatment with aminoethoxyvinyl glycine, an inhibitor of ethylene biosynthesis, both in this mutant and wild-type plants. Pretreatment with methyl-jasmonate (MeJA) at 10 µM, however, suppressed the ozone-induced ethylene emission and foliar injury only in the wild-type plants. This mutant was less sensitive to jasmonate than the wild type, estimated by the MeJA-induced inhibition of root elongation and ozone-induced expression of AtVSP1, a jasmonate-inducible gene. Thus, this mutant was named oji1 (ozone-sensitive and jasmonate-insensitive 1). These results suggest that the ozone sensitivity of oji1 is caused by the increase in ozone-induced emission of ethylene as a result of low sensitivity to jasmonate, which plays defensive roles under stress conditions.

9 Corresponding author: E-mail, maono{at}nies.go.jp; Fax, +81-29-850-2585.


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