Emerging Insights Into Cuticular Wax Biosynthesis and Its Response to Abiotic Stresses.

Plant cuticular wax biosynthesis and transport are increasingly clarified, with recent breakthroughs highlighting carbon reallocation between alkane- and alcohol-forming pathways and emerging branched-chain wax routes.

• Why it matters: Wax barriers protect plants from abiotic stresses, but ongoing discovery of wax-defective mutants and new technologies are continually reshaping pathway models and leaving key gaps.
• What they did: The work provides a comprehensive summary of biosynthetic pathway and transport mechanisms, emphasizing recent findings on carbon reallocation and branched-chain wax biosynthesis, and reviews stress-responsive behavior.
• The result: The review consolidates how wax synthesis responds to salt, extreme water conditions, temperature, and light, while identifying remaining gaps in non-model plants and the physiological function and molecular mechanisms of branched wax.

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