Cell wall damage attenuates root hair patterning and tissue morphogenesis mediated by the receptor kinase STRUBBELIG

Cell wall remodeling is essential for the control of growth and development as well as the regulation of stress responses. However, the underlying cell wall monitoring mechanisms remain poorly understood. Regulation of root hair fate and flower development in Arabidopsis thaliana requires signaling...

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Main Authors: Chaudhary, Ajeet (Author) , Chen, Xia (Author) , Leśniewska, Barbara (Author) , Boikine, Rodion (Author) , Gao, Jin (Author) , Wolf, Sebastian (Author) , Schneitz, Kay (Author)
Format: Article (Journal)
Language:English
Published: 12 July 2021
In: Development
Year: 2021, Volume: 148, Issue: 14, Pages: 1-12
ISSN:1477-9129
DOI:10.1242/dev.199425
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1242/dev.199425
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Author Notes:Ajeet Chaudhary, Xia Chen, Barbara Leśniewska, Rodion Boikine, Jin Gao, Sebastian Wolf and Kay Schneitz

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520 |a Cell wall remodeling is essential for the control of growth and development as well as the regulation of stress responses. However, the underlying cell wall monitoring mechanisms remain poorly understood. Regulation of root hair fate and flower development in Arabidopsis thaliana requires signaling mediated by the atypical receptor kinase STRUBBELIG (SUB). Furthermore, SUB is involved in cell wall integrity signaling and regulates the cellular response to reduced levels of cellulose, a central component of the cell wall. Here, we show that continuous exposure to sub-lethal doses of the cellulose biosynthesis inhibitor isoxaben results in altered root hair patterning and floral morphogenesis. Genetically impairing cellulose biosynthesis also results in root hair patterning defects. We further show that isoxaben exerts its developmental effects through the attenuation of SUB signaling. Our evidence indicates that downregulation of SUB is a multi-step process and involves changes in SUB complex architecture at the plasma membrane, enhanced removal of SUB from the cell surface, and downregulation of SUB transcript levels. The results provide molecular insight into how the cell wall regulates cell fate and tissue morphogenesis. 
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