**Preface to "Plant Cell Wall Proteins and Development"**

This book focuses on plant cell wall proteins and their roles during development and in response to abiotic stresses. Plant cell walls are mainly composed of polymers, such as polysaccharides or lignins. Although proteins are minor components, they play crucial roles in signaling and in the dynamics of the cell wall architecture, enabling growth, differentiation, and the adaptation of plants to their changing environment. This collection of research reports and reviews published in a Special Issue of *IJMS* includes a broad range of topics and experimental approaches which illustrate recent advances in cell wall biology.
