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Plant and Cell Physiology Advance Access published online on July 2, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj079
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© The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received March 8, 2006
Accepted June 20, 2006

Short Communication

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

Frank Waller 1, Axel Müller 2, Kwi-Mi Chung 3, Yun-Kiam Yap 4, Kimiyo Nakamura 3, Elmar Weiler 2, and Hiroshi Sano 3 *

1 Research and Education Center for Genetic Information, Nara Institute of Science and Technology, Nara 630-0192, Japan; Institute of Phytopathology and Applied Zoology, Justus-Liebig-University Giessen, D-35392 Giessen, Germany
2 Lehrstuhl für Pflanzenphysiologie, Ruhr-Universität Bochum, 44793 Bochum, Germany
3 Research and Education Center for Genetic Information, Nara Institute of Science and Technology, Nara 630-0192, Japan
4 Research and Education Center for Genetic Information, Nara Institute of Science and Technology, Nara 630-0192, Japan; Institute of Molecular Biology and Genetics, Mahidol University, Nakhon Pathom 73170, Thailand

* To whom correspondence should be addressed.
Hiroshi Sano, E-mail: sano{at}gtc.naist.jp


  Abstract

NtWIF is a transcription factor activated upon phosphorylation by WIPK in tobacco plants. Transgenic tobacco plants over-expressing 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. Levels of jasmonic and indoleacetic acids did not significantly differ, while an increase of abscisic acid 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 down-stream of WIPK.

Keywords: Hypersensitive response; necrotic lesion; Nicotiana tabacum; salicylic acid; tobacco mosaic virus; wound induced protein kinase.
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