The Role and Regulatory Mechanisms of Cuticular Wax in Crop Stress Tolerance and Yield

Cuticular waxes form a crucial hydrophobic barrier on the surface of aboveground organs in terrestrial plants. It strongly influences crop stress tolerance and yield stability, making them important target traits in modern crop breeding. This review systematically summarizes recent advances in how cuticular waxes contribute to crop stress tolerance and yield formation. It covers the chemical composition of cuticular waxes, key pathways and regulatory networks, and the physiological and biochemical mechanisms. In addition, this review highlights the role of cuticle waxes in maintaining crop yield and quality by regulating essential physiological processes, including photosynthetic metabolism and water-use efficiency. Current research indicates that cuticular wax accumulation shows strong crop-specific patterns and is dynamically regulated by environmental factors. Breakthrough studies in major crops have clarified the regulatory mechanisms of several core genes and demonstrated that cuticular waxes enhance stress resistance by strengthening physical barriers, improving water-use efficiency, and protecting photosynthetic structures. A deeper understanding of cuticular wax regulatory mechanisms will help reveal the molecular basis of crop stress resistance and provide both theoretical support and practical guidance for breeding crop varieties with enhanced stress tolerance and stable yields.