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Plant and Cell Physiology Advance Access originally published online on October 5, 2005
Plant and Cell Physiology 2005 46(12):1902-1914; doi:10.1093/pcp/pci211
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A Mitogen-activated Protein Kinase NtMPK4 Activated by SIPKK is Required for Jasmonic Acid Signaling and Involved in Ozone Tolerance via Stomatal Movement in Tobacco

Kenji Gomi1,5, Daisuke Ogawa2,3, Shinpei Katou1, Hiroshi Kamada2, Nobuyoshi Nakajima3, Hikaru Saji3, Takashi Soyano4, Michiko Sasabe4, Yasunori Machida4, Ichiro Mitsuhara1, Yuko Ohashi1,5 and Shigemi Seo1,5,*

1 Plant Physiology Department, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, 305-8602 Japan
2 Graduate School of Life and Environmental Sciences, Tsukuba University, Tsukuba, Ibaraki, 305-0033 Japan
3 Environmental Biology Division, National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-8506 Japan
4 Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya, 464-8602 Japan
5 Program for Promotion of Basic Research Activities for Innovative Bioscience, Minato-ku, Tokyo, 105-0001 Japan

* Corresponding author: E-mail, sseo71{at}affrc.go.jp; Fax, +81-29-838-7469.

The mitogen-activated protein kinase (MAPK) cascade is involved in responses to biotic and abiotic stress in plants. In this study, we isolated a new MAPK, NtMPK4, which is a tobacco homolog of Arabidopsis MPK4 (AtMPK4). NtMPK4 was activated by wounding along with two other wound-responsive tobacco MAPKs, WIPK and SIPK. We found that NtMPK4 was activated by salicylic acid-induced protein kinase kinase (SIPKK), which has been isolated as an SIPK-interacting MAPK kinase. In NtMPK4 activity-suppressed tobacco, wound-induced expression of jasmonic acid (JA)-responsive genes was inhibited. NtMPK4-silenced plants showed enhanced sensitivity to ozone. Inversely, transgenic tobacco plants, in which SIPKK or the constitutively active type SIPKKEE was overexpressed, exhibited greater responsiveness to wounding with enhanced resistance to ozone. We further found that NtMPK4 was expressed preferentially in epidermis, and the enhanced sensitivity to ozone in NtMPK4-silenced plants was caused by an abnormal regulation of stomatal closure in an ABA-independent manner. These results suggest that NtMPK4 is involved in JA signaling and in stomatal movement.

The nucleotide sequence reported in this paper has been submitted to GenBank under accession number AB212070 [GenBank] .

(Received September 26, 2005; Accepted September 30, 2005)
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