ArticlePlant cell reports2025
Deciphering UV-C-induced transcriptomic shifts in tomato: defence mechanisms, stress responses, and photoreceptor regulation.
Article in Plant cell reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
key messageThis study reveals transcriptomic reprogramming in tomato under UV-C, highlighting enriched defence pathways, calcium signalling, enhanced pathogen tolerance, increased defence enzyme activity, and photoreceptor-mediated UV-C perception, linking light signalling to stress adaptation. UV-C radiation, when applied at hormetic dosage, acts as a mild abiotic stressor in plants, triggering beneficial responses that enhance yield and bioactive compound production. However, transcriptomic responses to UV-C remain underexplored. This study investigates UV-C-induced transcriptomic changes in two tomato cultivars with differing UV-C susceptibility; Red Rock (susceptible) and Super Star (comparatively tolerant). RNA-seq analysis revealed 3540 DEGs in Red Rock and 2678 in Super Star, with a higher proportion of up-regulated genes in both cultivars after UV-C exposure. GO analysis indicated a conserved response, with enriched pathways associated with defence and stress adaptation. KEGG and PGSEA analyses highlighted significant enrichment in phenylpropanoid biosynthesis, plant-pathogen interaction, and fatty acid degradation pathways. Calcium-binding and signalling genes were predominantly up-regulated, suggesting a key role in UV-C-induced defence responses. RT-qPCR analysis of 17 selected genes, in both cultivars, showed the highest change in expression for Solyc06g069740.1, encoding a calcium-binding EF-hand family protein involved in signal transduction and Solyc05g050350.2, a Cyclic nucleotide-gated ion channel 1 involved in ion transport across the membrane during defence response. Detached leaf assays with Botrytis cinerea and Sclerotinia sclerotiorum demonstrated enhanced pathogen tolerance in UV-C-treated plants, with reduced lesion sizes and increased defence enzyme activity, including chitinase, phenylalanine ammonia-lyase, β-1,3-glucanase, and polyphenol oxidase, compared to fungal-treated controls. Further analysis of photoreceptors revealed upregulation of UV Resistance Locus 8 and Cryptochromes, linking UV-C perception to downstream signalling. These findings provide insights into UV-C-induced defence mechanisms and potential applications for improving crop resilience and productivity.
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