Abstract
Heat stress has a significant negative impact on plant growth, development, and yield. The cell wall, a key structural feature that sets plants apart from animals, not only acts as the first physical barrier against heat stress but also plays an active role in the heat stress (HS) response through signaling pathways. The plant cell wall has a complex structural composition, including cellulose, hemicellulose, lignin, and pectin. These components not only provide mechanical support for cell growth but also constitute the material basis for plant response to environmental changes. This review summarizes recent research on how the cell wall's structural composition affects its mechanical properties in response to stresses. It examines changes in plant cell walls under HS and the adaptive mechanisms leading to cell wall thickening. Additionally, it explores the role of cell wall integrity in sensing and transmitting HS, along with the molecular mechanisms that maintain this integrity. Finally, it addresses unresolved scientific questions regarding plant cell wall responses to HS. This review aims to provide a theoretical foundation and research direction for enhancing plant thermotolerance through genetic improvement of the cell wall.