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.

• Klíčová slova
• auxin, cell wall, gravitropism, growth, hypocotyls, xyloglucans,
• MeSH
• Arabidopsis fyziologie   MeSH
• buněčná stěna metabolismus   MeSH
• fluorescenční protilátková technika MeSH
• fyziologie rostlin * MeSH
• glukany chemie   metabolismus   MeSH
• hrách setý fyziologie   MeSH
• kyseliny indoloctové metabolismus   MeSH
• regulace genové exprese u rostlin MeSH
• rostlinné buňky metabolismus   MeSH
• signální transdukce MeSH
• vývoj rostlin * MeSH
• xylany chemie   metabolismus   MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• glukany MeSH
• kyseliny indoloctové MeSH
• xylany MeSH
• xyloglucan MeSH Prohlížeč