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A dirigent protein complex directs lignin polymerization and assembly of the root diffusion barrier.
- Source :
-
Science (New York, N.Y.) [Science] 2023 Oct 27; Vol. 382 (6669), pp. 464-471. Date of Electronic Publication: 2023 Oct 26. - Publication Year :
- 2023
-
Abstract
- Functionally similar to the tight junctions present in animal guts, plant roots have evolved a lignified Casparian strip as an extracellular diffusion barrier in the endodermis to seal the root apoplast and maintain nutrient homeostasis. How this diffusion barrier is structured has been partially defined, but its lignin polymerization and assembly steps remain elusive. Here, we characterize a family of dirigent proteins (DPs) essential for both the localized polymerization of lignin required for Casparian strip biogenesis in the cell wall and for attachment of the strip to the plasma membrane to seal the apoplast. We reveal a Casparian strip lignification mechanism that requires cooperation between DPs and the Schengen pathway. Furthermore, we demonstrate that DPs directly mediate lignin polymerization as part of this mechanism.
Details
- Language :
- English
- ISSN :
- 1095-9203
- Volume :
- 382
- Issue :
- 6669
- Database :
- MEDLINE
- Journal :
- Science (New York, N.Y.)
- Publication Type :
- Academic Journal
- Accession number :
- 37883539
- Full Text :
- https://doi.org/10.1126/science.adi5032