Auxin-dependent xyloglucan remodelling defines differential tissue expansion in Arabidopsis thaliana

Size control is a fundamental question in biology, showing incremental complexity in case of cell wall surrounded plant cells. Here we show that auxin signalling restricts the complexity of extracellular xyloglucans, which defines cell wall properties and tissue expansion. Our work uncovers an alternative mechanism of how the phytohormone auxin modulates the cell wall for steering differential growth control in gravitropic hypocotyls.