Moderate Water Deficit Improves Tomato Fruit Nutritional Quality Through SlNAP2-Mediated Transcriptional Activation of Lycopene and Ascorbic Acid Biosynthesis Genes.

Moderate water deficit increases tomato fruit levels of lycopene and ascorbic acid by up to 1.7-fold through SlNAP2-mediated gene activation.

• Why it matters: Understanding how water deficit improves fruit nutritional quality can inform sustainable crop management practices. The molecular mechanisms behind this process are largely unknown, limiting practical applications.
• What they did: Researchers used transcriptome analysis, RT-qPCR, and gene knockout and overexpression experiments in tomato (Solanum lycopersicum L.) to investigate the role of SlNAP2, a transcription factor, in response to moderate water deficit.
• The result: Moderate water deficit elevates key nutrients in tomato fruits via SlNAP2-dependent activation of lycopene and ascorbic acid biosynthesis genes, establishing SlNAP2 as a central regulator linking water stress to improved fruit quality.