Functional diversification of CsCAD14 orchestrates synergistic phenylpropanoid biosynthesis to defend gray blight disease in tea plants.

CsCAD14's dual enzymatic activity boosts phenylpropanoid biosynthesis, enhancing gray blight resistance in Camellia sinensis with a 2-fold increase in defense metabolites.

• Why it matters: Understanding how plants evolved specialized enzymes to defend against pathogens is vital for improving crop resilience and managing plant diseases effectively.
• What they did: Researchers characterized CsCAD14's dual activity, compared it to CsCAD11, and analyzed genetic mutations in resistant and susceptible cultivars, revealing key functional differences.
• The result: The study demonstrates that dual-activity CsCAD14 enhances disease resistance by increasing defense-related metabolites, and evolutionary changes underpin this functional diversification, offering targets for breeding disease-resistant tea varieties.