Scientific article
Open access

Surveillance of cell wall diffusion barrier integrity modulates water and solute transport in plants

Published inScientific reports, vol. 9, no. 1, 4227
Publication date2019-03-12
First online date2019-03-12

The endodermis is a key cell layer in plant roots that contributes to the controlled uptake of water and mineral nutrients into plants. In order to provide such functionality the endodermal cell wall has specific chemical modifications consisting of lignin bands (Casparian strips) that encircle each cell, and deposition of a waxy-like substance (suberin) between the wall and the plasma membrane. These two extracellular deposits provide control of diffusion enabling the endodermis to direct the movement of water and solutes into and out of the vascular system in roots. Loss of integrity of the Casparian strip-based apoplastic barrier is sensed by the leakage of a small peptide from the stele into the cortex. Here, we report that such sensing of barrier integrity leads to the rebalancing of water and mineral nutrient uptake, compensating for breakage of Casparian strips. This rebalancing involves both a reduction in root hydraulic conductivity driven by deactivation of aquaporins, and downstream limitation of ion leakage through deposition of suberin. These responses in the root are also coupled to a reduction in water demand in the shoot mediated by ABA-dependent stomatal closure.

  • Arabidopsis / genetics
  • Arabidopsis / metabolism
  • Biological Transport / physiology
  • Cell Wall / genetics
  • Cell Wall / metabolism
  • Diffusion
  • Lignin / genetics
  • Lignin / metabolism
  • Lipids / genetics
  • Plant Roots / genetics
  • Plant Roots / metabolism
  • Water / metabolism
  • Biotechnology and Biological Sciences Research Council - [BB/N023927/1]
Citation (ISO format)
WANG, Peng et al. Surveillance of cell wall diffusion barrier integrity modulates water and solute transport in plants. In: Scientific reports, 2019, vol. 9, n° 1, p. 4227. doi: 10.1038/s41598-019-40588-5
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ISSN of the journal2045-2322

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