Plant Cell Advance Online Publication
Published on November 17, 2006; 10.1105/tpc.106.047399
Received September 15, 2006
Returned for revision October 15, 2006
Accepted November 1, 2006
SND1, a NAC Domain Transcription Factor, Is a Key Regulator of Secondary Wall Synthesis in Fibers of Arabidopsis
Ruiqin Zhong 1, Taku Demura 2, and Zheng-Hua Ye 1*
1 Department of Plant Biology, University of Georgia, Athens, Georgia 30602
2 RIKEN Plant Science Center, Yokohama, Kanagawa 230-0045, Japan
* To whom correspondence should be addressed. E-mail: zhye{at}plantbio.uga.edu.
Secondary walls in fibers and tracheary elements constitute the most abundant biomass produced by plants. Although a number of genes involved in the biosynthesis of secondary wall components have been characterized, little is known about the molecular mechanisms underlying the coordinated expression of these genes. Here, we demonstrate that the Arabidopsis thaliana NAC (for NAM, ATAF1/2, and CUC2) domain transcription factor, SND1 (for secondary wall-associated NAC domain protein), is a key transcriptional switch regulating secondary wall synthesis in fibers. We show that SND1 is expressed specifically in interfascicular fibers and xylary fibers in stems and that dominant repression of SND1 causes a drastic reduction in the secondary wall thickening of fibers. Ectopic overexpression of SND1 results in activation of the expression of secondary wall biosynthetic genes, leading to massive deposition of secondary walls in cells that are normally nonsclerenchymatous. In addition, we have found that SND1 upregulates the expression of several transcription factors that are highly expressed in fibers during secondary wall synthesis. Together, our results reveal that SND1 is a key transcriptional activator involved in secondary wall biosynthesis in fibers.
This article has been cited by other articles:
|
|
|
|
 
C. Bomal, F. Bedon, S. Caron, S. D. Mansfield, C. Levasseur, J. E. K. Cooke, S. Blais, L. Tremblay, M.-J. Morency, N. Pavy, et al.
Involvement of Pinus taeda MYB1 and MYB8 in phenylpropanoid metabolism and secondary cell wall biogenesis: a comparative in planta analysis
J. Exp. Bot.,
October 1, 2008;
59(14):
3925 - 3939.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
C. Lee, R. Zhong, E. A. Richardson, D. S. Himmelsbach, B. T. McPhail, and Z.-H. Ye
The PARVUS Gene is Expressed in Cells Undergoing Secondary Wall Thickening and is Essential for Glucuronoxylan Biosynthesis
Plant Cell Physiol.,
December 1, 2007;
48(12):
1659 - 1672.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
K. S. Dhugga
Maize Biomass Yield and Composition for Biofuels
Crop Sci.,
November 7, 2007;
47(6):
2211 - 2227.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
S. Ma, Q. Gong, and H. J. Bohnert
An Arabidopsis gene network based on the graphical Gaussian model
Genome Res.,
November 1, 2007;
17(11):
1614 - 1625.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
R. Zhong, E. A. Richardson, and Z.-H. Ye
The MYB46 Transcription Factor Is a Direct Target of SND1 and Regulates Secondary Wall Biosynthesis in Arabidopsis
PLANT CELL,
September 1, 2007;
19(9):
2776 - 2792.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
M. J. Pena, R. Zhong, G.-K. Zhou, E. A. Richardson, M. A. O'Neill, A. G. Darvill, W. S. York, and Z.-H. Ye
Arabidopsis irregular xylem8 and irregular xylem9: Implications for the Complexity of Glucuronoxylan Biosynthesis
PLANT CELL,
February 1, 2007;
19(2):
549 - 563.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
N. Mitsuda, A. Iwase, H. Yamamoto, M. Yoshida, M. Seki, K. Shinozaki, and M. Ohme-Takagi
NAC Transcription Factors, NST1 and NST3, Are Key Regulators of the Formation of Secondary Walls in Woody Tissues of Arabidopsis
PLANT CELL,
January 1, 2007;
19(1):
270 - 280.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
