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Plant and Cell Physiology Advance Access originally published online on July 2, 2006
Plant and Cell Physiology 2006 47(8):1169-1174; doi:10.1093/pcp/pcj079
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

Expression of a WIPK-Activated Transcription Factor Results in Increase of Endogenous Salicylic Acid and Pathogen Resistance in Tobacco Plants

Frank Waller1,3, Axel Müller2, Kwi-Mi Chung1, Yun-Kiam Yap1,4, Kimiyo Nakamura1, Elmar Weiler2 and Hiroshi Sano1,*

1 Research and Education Center for Genetic Information, Nara Institute of Science and Technology, Nara, 630-0192 Japan
2 Lehrstuhl für Pflanzenphysiologie, Ruhr-Universität Bochum, D-44793 Bochum, Germany

* Corresponding author: E-mail, sano{at}gtc.naist.jp; Fax, +81-743-72-5659.

NtWIF is a transcription factor activated upon phosphorylation by wound-induced protein kinase (WIPK) in tobacco plants. Transgenic tobacco plants overexpressing NtWIF exhibited constitutive accumulation of transcripts for pathogenesis-related genes, PR-1a and PR-2. Salicylic acid levels were 50-fold higher than those in wild-type plants. The levels of jasmonic acid and IAA did not significantly differ, while an increase of ABA upon wounding was delayed by 3 h in the transgenics. When challenged with tobacco mosaic virus, lesions developed faster and were smaller in the transgenic plants. The results suggest that NtWIF is likely to influence salicylic acid biosynthesis, being located downstream of WIPK.

3 Present address: Institute of Phytopathology and Applied Zoology, Justus-Liebig-University Giessen, D-35392 Giessen, Germany.

4 Present address: Institute of Molecular Biology and Genetics, Mahidol University, Nakhon Pathom 73170, Thailand.

(Received March 8, 2006; Accepted June 20, 2006)
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