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Front Plant Sci. 2015 May 5;6:288. doi: 10.3389/fpls.2015.00288. eCollection 2015.

NAC-MYB-based transcriptional regulation of secondary cell wall biosynthesis in land plants.

Author information

1
Graduate School of Biological Sciences, Nara Institute of Science and Technology Ikoma, Japan.
2
Division of Strategic Research and Development, Graduate School of Science and Engineering, Saitama University Saitama, Japan ; PRESTO (Precursory Research for Embryonic Science and Technology), Japan Science and Technology Agency Kawaguchi, Japan.
3
Graduate School of Biological Sciences, Nara Institute of Science and Technology Ikoma, Japan ; Faculty of Science, Institute of Biological Sciences, University of Malaya Kuala Lumpur, Malaysia.
4
Graduate School of Biological Sciences, Nara Institute of Science and Technology Ikoma, Japan ; Biomass Engineering Program Cooperation Division, RIKEN Center for Sustainable Resource Science Yokohama, Japan.

Abstract

Plant cells biosynthesize primary cell walls (PCW) in all cells and produce secondary cell walls (SCWs) in specific cell types that conduct water and/or provide mechanical support, such as xylem vessels and fibers. The characteristic mechanical stiffness, chemical recalcitrance, and hydrophobic nature of SCWs result from the organization of SCW-specific biopolymers, i.e., highly ordered cellulose, hemicellulose, and lignin. Synthesis of these SCW-specific biopolymers requires SCW-specific enzymes that are regulated by SCW-specific transcription factors. In this review, we summarize our current knowledge of the transcriptional regulation of SCW formation in plant cells. Advances in research on SCW biosynthesis during the past decade have expanded our understanding of the transcriptional regulation of SCW formation, particularly the functions of the NAC and MYB transcription factors. Focusing on the NAC-MYB-based transcriptional network, we discuss the regulatory systems that evolved in land plants to modify the cell wall to serve as a key component of structures that conduct water and provide mechanical support.

KEYWORDS:

MYB transcription factor; NAC transcription factor; land plant evolution; network; secondary cell wall

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