Auxin as an architect of the pectin matrix

Auxin is a versatile plant growth regulator that triggers multiple signalling pathways at different spatial and temporal resolutions. A plant cell is surrounded by the cell wall, a complex and dynamic network of polysaccharides. The cell wall needs to be rigid to provide mechanical support and protection and highly flexible to allow cell growth and shape acquisition. The modification of the pectin components, among other processes, is a mechanism by which auxin activity alters the mechanical properties of the cell wall. Auxin signalling precisely controls the transcriptional output of several genes encoding pectin remodelling enzymes, their local activity, pectin deposition, and modulation in different developmental contexts. This review examines the mechanism of auxin activity in regulating pectin chemistry at organ, cellular, and subcellular levels across diverse plant species. Moreover, we ask questions that remain to be addressed to fully understand the interplay between auxin and pectin in plant growth and development. The phytohormone auxin regulates most aspects of plant development. Auxin activity leads to intense modifications of the primary cell wall's pectin matrix, which we will focus on in this review.

Automated summary

Auxin is a plant growth regulator that modifies the mechanical properties of the cell wall by regulating the pectin composition. This review explores how auxin activity affects pectin chemistry at different levels and its impact on plant growth and development.