Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 22, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/ijms22179222
Keywords
auxin; growth; cell wall; xyloglucans; hypocotyls; gravitropism
Funding
- Villum Foundation [00017489]
- Vienna Science and Technology Fund (WWTF)
- European Research Council [639478]
- Austrian Science Fund (FWF) [P26333, P26591]
- Ministry of Education, Youth and Sports of the Czech Republic through the European Regional Development Fund [CZ.02.1.01/0.0/0.0/16_019/0000827]
- Austrian Science Fund (FWF) [P26591] Funding Source: Austrian Science Fund (FWF)
- European Research Council (ERC) [639478] Funding Source: European Research Council (ERC)
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Auxin plays a crucial role in controlling molecular complexity of cell wall hemicellulose and the rates of differential growth in plants.
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.
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