Two chemically distinct root lignin barriers control solute and water balance

Guilhem Reyt, Priya Ramakrishna, Isai Salas-González, Satoshi Fujita, Ashley Love, David Tiemessen, Catherine Lapierre, Kris Morreel, Monica Calvo-Polanco, Paulina Flis, Niko Geldner, Yann Boursiac, Wout Boerjan, Michael W. George, Gabriel Castrillo and David E. Salt ()
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Guilhem Reyt: University of Nottingham
Priya Ramakrishna: University of Nottingham
Isai Salas-González: University of North Carolina at Chapel Hill
Satoshi Fujita: Biophore, University of Lausanne
Ashley Love: University of Nottingham
David Tiemessen: University of Nottingham
Catherine Lapierre: Université Paris-Saclay
Kris Morreel: Ghent University
Monica Calvo-Polanco: University of Montpellier, CNRS, INRAE, SupAgro
Paulina Flis: University of Nottingham
Niko Geldner: Biophore, University of Lausanne
Yann Boursiac: University of Montpellier, CNRS, INRAE, SupAgro
Wout Boerjan: Ghent University
Michael W. George: University of Nottingham
Gabriel Castrillo: University of Nottingham
David E. Salt: University of Nottingham

Nature Communications, 2021, vol. 12, issue 1, 1-15

Abstract: 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.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22550-0

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DOI: 10.1038/s41467-021-22550-0

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