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First published online October 7, 2005; 10.1105/tpc.105.036004

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The Plant Cell 17:2993-3006 (2005)
© 2005 American Society of Plant Biologists

The NAC Transcription Factors NST1 and NST2 of Arabidopsis Regulate Secondary Wall Thickenings and Are Required for Anther Dehiscence{boxw}

Nobutaka Mitsudaa,b, Motoaki Sekic,d, Kazuo Shinozakib,c,d,e and Masaru Ohme-Takagia,b,1

a Gene Function Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8562, Japan
b Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
c Laboratory of Plant Molecular Biology, RIKEN Tsukuba Institute, Tsukuba, Ibaraki 305-0074, Japan
d Plant Functional Genomics Research Team, RIKEN Genomic Sciences Center, RIKEN Yokohama Institute, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
e RIKEN Plant Science Center, RIKEN Yokohama Institute, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan

1 To whom correspondence should be addressed. E-mail m-takagi{at}aist.go.jp; fax 81-29-861-3024.

In plants, secondary wall thickenings play important roles in various biological processes, although the factors regulating these processes remain to be characterized. We show that expression of chimeric repressors derived from NAC SECONDARY WALL THICKENING PROMOTING FACTOR1 (NST1) and NST2 in Arabidopsis thaliana resulted in an anther dehiscence defect due to loss of secondary wall thickening in anther endothecium. Plants with double, but not single, T-DNA–tagged lines for NST1 and NST2 had the same anther-indehiscent phenotype as transgenic plants that expressed the individual chimeric repressors, indicating that NST1 and NST2 are redundant in regulating secondary wall thickening in anther walls. The activity of the NST2 promoter was particularly strong in anther tissue, while that of the NST1 promoter was detected in various tissues in which lignified secondary walls develop. Ectopic expression of NST1 or NST2 induced ectopic thickening of secondary walls in various aboveground tissues. Epidermal cells with ectopic thickening of secondary walls had structural features similar to those of tracheary elements. However, among genes involved in the differentiation of tracheary elements, only those related to secondary wall synthesis were clearly upregulated. None of the genes involved in programmed cell death were similarly affected. Our results suggest NAC transcription factors as possible regulators of secondary wall thickening in various tissues.




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