Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 27, Pages 15400-15402Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2005429117
Keywords
Casparian strip; laccase; lignin; positional information; copper
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Funding
- National Key Research and Development Program of China [2017YFA0503800]
- National Natural Science Foundation of China [31621001]
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The Casparian strip (CS) is a tight junction -like structure formed by lignin impregnation on the walls of endodermal cells in plant roots. The CS membrane domain (CSD M ), demarked by the CASP proteins, is important for orienting lignification enzymes. Here, we report that an endodermis -expressed multicopper oxidase, LACCASE3 (LAC3) in Arabidopsis , locates to the interface between lignin do- mains and the cell wall during early CS development prior to CASP1 localizing to CSD M and eventually flanks the mature CS. Pharmaco- logical perturbation of LAC3 causes dispersed localization of CASP1 and compensatory ectopic lignification. These results support the existence of a LAC3-based CS wall domain which coordinates with CSD M to provide bidirectional positional information that guides precise CS lignification.
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