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The maize ZmMYB42 represses the phenylpropanoid pathway and affects the cell wall structure, composition and degradability in Arabidopsis thaliana

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Abstract

The involvement of the maize ZmMYB42 R2R3-MYB factor in the phenylpropanoid pathway and cell wall structure and composition was investigated by overexpression in Arabidopsis thaliana. ZmMYB42 down-regulates several genes of the lignin pathway and this effect reduces the lignin content in all lignified tissues. In addition, ZmMYB42 plants generate a lignin polymer with a decreased S to G ratio through the enrichment in H and G subunits and depletion in S subunits. This transcription factor also regulates other genes involved in the synthesis of sinapate esters and flavonoids. Furthermore, ZmMYB42 affects the cell wall structure and degradability, and its polysaccharide composition. Together, these results suggest that ZmMYB42 may be part of the regulatory network controlling the phenylpropanoid biosynthetic pathway.

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Acknowledgements

This work received financial support from the CONSOLIDER-INGENIO programme (CSD2007-00036) from the Spanish Ministerio de Ciencia e Innovación. F.M. Sonbol was financed by the European Project INCO-II (ICA4-CT-2000-30017), by the CRAG laboratory, and by the “Instituto de Cooperación con el Mundo Árabe, Agencia Española de Cooperación Internacional”. S. Fornale was financed by a post-doctoral grant from the “Generalitat de Catalunya” (2003PIV-A-00033) and by an I3P contract from the “Consejo Superior de Investigaciones Científicas”. D. Caparrós-Ruiz was financed by the Spanish “Ministerio de Educación y Ciencia” (“Ramón y Cajal” Program). This work was carried out within the framework of the “Xarxa de Referència de Biotecnologia” (XarBa) from the Autonomous Government of Catalonia. We are indebted to Dr. Jean-Paul Joseleau (CERMAV-CNRS Grenoble) and Dr. Cathie R. Martin (John Innes Center) for critical reading of the manuscript. We also thank the sequencing and greenhouse teams of IBMB-CSIC as well as Dr. R.S. Joshi for the English revision of the manuscript.

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Correspondence to Joan Rigau.

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Fathi-Mohamed Sonbol and Silvia Fornalé contributed equally to this work.

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Sonbol, FM., Fornalé, S., Capellades, M. et al. The maize ZmMYB42 represses the phenylpropanoid pathway and affects the cell wall structure, composition and degradability in Arabidopsis thaliana . Plant Mol Biol 70, 283–296 (2009). https://doi.org/10.1007/s11103-009-9473-2

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  • DOI: https://doi.org/10.1007/s11103-009-9473-2

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