Genome-wide analysis of the pectin acetylesterase (PAE) gene family in tomato and SlPAE16 functional characterization associated with pedicel abscission.

Pectin acetylesterase (PAE) regulates pectin acetylation, which affects plant growth, development, and stress tolerance. While their functions are well-defined in models like Arabidopsis, we still know surprisingly little about how they operate in tomatoes (Solanum lycopersicum). We identified 17 SlPAE genes using tomato genome-wide analysis. These genes were classified phylogenetically into three conserved subfamilies, with branch members sharing domain architectures, motifs, and genomic structure. Promoter cis-element analysis identified multiple motifs related to hormone signaling, light response, and stress response. Spatiotemporal expression patterns obtained via qRT-PCR revealed the functional roles of SlPAE genes. Notably, silencing SlPAE16 effectively retarded pedicel abscission, a process mediated by the inhibition of TAPG1/2/4 expression. These findings clarify the functional diversity within the PAE gene family, providing a much-needed framework for future research into their specific biological roles in tomatoes.