Guilhem Reyt1, Priya Ramakrishna1,2, Isai Salas-González3, Satoshi Fujita4,5, Ashley Love6, David Tiemessen6, Catherine Lapierre7, Kris Morreel8,9, Monica Calvo-Polanco10,11, Paulina Flis1, Niko Geldner4, Yann Boursiac10, Wout Boerjan8,9, Michael W George6,12, Gabriel Castrillo1, David E Salt13. 1. Future Food Beacon of Excellence & School of Biosciences, University of Nottingham, Sutton Bonington, UK. 2. Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland. 3. Curriculum in Bioinformatics and Computational Biology, Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. 4. Department of Plant Molecular Biology, Biophore, University of Lausanne, Lausanne, Switzerland. 5. National Institute of Genetics, Mishima, Shizuoka, Japan. 6. School of Chemistry, University of Nottingham, Nottingham, UK. 7. Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France. 8. Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium. 9. Center for Plant Systems Biology, VIB, Ghent, Belgium. 10. Biochimie & Physiologie Moléculaire des Plantes, University of Montpellier, CNRS, INRAE, SupAgro, Montpellier, France. 11. Excellence Unit AGRIENVIRONMENT, CIALE, University of Salamanca, Salamanca, Spain. 12. Department of Chemical and Environmental Engineering, The University of Nottingham Ningbo China, Ningbo, China. 13. Future Food Beacon of Excellence & School of Biosciences, University of Nottingham, Sutton Bonington, UK. david.salt@nottingham.ac.uk.
Abstract
Lignin is a complex polymer deposited in the cell wall of specialised plant cells, where it provides essential cellular functions. Plants coordinate timing, location, abundance and composition of lignin deposition in response to endogenous and exogenous cues. In roots, a fine band of lignin, the Casparian strip encircles endodermal cells. This forms an extracellular barrier to solutes and water and plays a critical role in maintaining nutrient homeostasis. A signalling pathway senses the integrity of this diffusion barrier and can induce over-lignification to compensate for barrier defects. Here, we report that activation of this endodermal sensing mechanism triggers a transcriptional reprogramming strongly inducing the phenylpropanoid pathway and immune signaling. This leads to deposition of compensatory lignin that is chemically distinct from Casparian strip lignin. We also report that a complete loss of endodermal lignification drastically impacts mineral nutrients homeostasis and plant growth.
ass="Chemical">Lignin is a complex ass="Chemical">pan class="Chemical">polymer deposited in the cell wall of specialised plant cells, where it provides essential cellular functions. Plants coordinate timing, location, abundance and composition of lignin deposition in response to endogenous and exogenous cues. In roots, a fine band of lignin, the Casparian strip encircles endodermal cells. This forms an extracellular barrier to solutes and water and plays a critical role in maintaining nutrient homeostasis. A signalling pathway senses the integrity of this diffusion barrier and can induce over-lignification to compensate for barrier defects. Here, we report that activation of this endodermal sensing mechanism triggers a transcriptional reprogramming strongly inducing the phenylpropanoid pathway and immune signaling. This leads to deposition of compensatory lignin that is chemically distinct from Casparian strip lignin. We also report that a complete loss of endodermal lignification drastically impacts mineral nutrients homeostasis and plant growth.
Authors: Ivan Baxter; Christian Hermans; Brett Lahner; Elena Yakubova; Marina Tikhonova; Nathalie Verbruggen; Dai-Yin Chao; David E Salt Journal: PLoS One Date: 2012-04-27 Impact factor: 3.240