Review: Tertiary cell wall of plant fibers as a source of inspiration in material design.

The review summarizes the plant lifehacks on material design on the example of the impressive cellulose-enriched cell wall deposited by fibers of many plants. This specific cell wall type is called tertiary since it is deposited after the secondary cell wall and is very distinct in the machinery of formation and function. The basic principles of tertiary cell wall performance include: 1) original composition (two major players - cellulose microfibrils and the version of rhamnogalacturonan I that forms specific supramolecular structures); 2) original cell wall design with axial orientation of all cellulose microfibrils, pronounced lateral interactions between them and the presence of the entrapped rhamnogalacturonan I; 3) dynamic changes in cell wall supramolecular organization due to rhamnogalacturonan I modifications in muro in the course of fiber maturation; 4) the built-in sensors that trace the cell wall state; 5) incorporation of tertiary cell wall into the system with higher level of organization.