Parallel Genome-Wide Identification and Analysis of the COMT Gene Family in Potato (Solanum tuberosum L.) and Arabidopsis ( Arabidopsis thaliana (L.) Heynh.)

Lignin and melatonin play crucial roles in plant stress resistance, and COMT (Caffeic acid O-methyltransferase) genes are key regulators in their biosynthesis, contributing significantly to plant adaptation under adverse conditions.Although COMT genes have been characterized in multiple plant species, research in potato has so far been limited to individual genes. In this study, we present the first genome-wide identification and systematic analysis of the COMT gene family in potato. A total of 12 StCOMT members were identified and comparatively analyzed with 10 Arabidopsis counterparts. These genes were predominantly distributed on one chromosome, with additional members scattered across other chromosomes.Phylogenetic analysis revealed that COMT genes are evolutionarily conserved and can be classified into five subfamilies.Partial members exhibited syntenic relationships.The encoded proteins typically displayed acidic and hydrophobic properties, formed stable dimeric structures, and were primarily localized to the chloroplast.Promoter analysis identified numerous light- and hormone-responsive elements.Expression profiling demonstrated both tissue-specific and stress-induced patterns among members.These findings indicate that COMT genes play a critical role in potato stress resistance and provide valuable genetic resources and a theoretical basis for stress-tolerant potato breeding.Further functional validation through biological experiments will be essential.