Xyloglucan Remodeling Defines Auxin-Dependent Differential Tissue Expansion in Plants.
Int J Mol Sci
; 22(17)2021 Aug 26.
Article
in En
| MEDLINE
| ID: mdl-34502129
ABSTRACT
Size control is a fundamental question in biology, showing incremental complexity in plants, whose cells possess a rigid cell wall. The phytohormone auxin is a vital growth regulator with central importance for differential growth control. Our results indicate that auxin-reliant growth programs affect the molecular complexity of xyloglucans, the major type of cell wall hemicellulose in eudicots. Auxin-dependent induction and repression of growth coincide with reduced and enhanced molecular complexity of xyloglucans, respectively. In agreement with a proposed function in growth control, genetic interference with xyloglucan side decorations distinctly modulates auxin-dependent differential growth rates. Our work proposes that auxin-dependent growth programs have a spatially defined effect on xyloglucan's molecular structure, which in turn affects cell wall mechanics and specifies differential, gravitropic hypocotyl growth.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
Xylans
/
Plant Physiological Phenomena
/
Plant Cells
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Plant Development
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Glucans
/
Indoleacetic Acids
Language:
En
Year:
2021
Type:
Article