Plant Cell Walls

A central question in plant biology is how plant cells can expand while maintaining a strong cell wall.Two main mechanisms have been proposed for irreversible wall expansion, intussusception and chemorheological growth.We discuss here the molecular nature of the cross-links and how their removal can contribute to growth of both tip-growing or diffusely-growing cells.We also discuss recent observations suggesting that at least in some cases processive intussusception may contribute to cell wall expansion in plants.