Improving Crop Tolerance to Abiotic Stress for Sustainable Agriculture: Progress in Manipulating Ascorbic Acid Metabolism via Genome Editing.

Plants often encounter challenging environmental factors, including intense sunlight, drought, extreme heat, cold temperatures, salinity, excessive metals, and nutrient shortages, which can heavily affect their growth and survival. In this regard, L-ascorbic acid (AsA) is not only an essential nutrient for human health but also plays a significant role in plant responses to environmental stresses, regulating various functions during growth and development, redox signaling, and phytohormone biosynthesis. The growing need to cope with climate change, together with the advancement of CRISPR/Cas9-editing technologies, stimulated new opportunities to enhance AsA biosynthesis to improve crop stress tolerance. In this review, we discuss the biosynthesis and regulation of AsA in abiotic stress response mechanisms. We also explore the latest advancements of CRISPR/Cas9 technologies, their applications, and their challenges as tools for modifying genes associated with AsA metabolism, aiming to develop crops more tolerant and resilient to environmental changes. [ABSTRACT FROM AUTHOR]