Methylesterase shown to have carboxylesterase activity and methyl salicylate (MeSA) esterase activity in vitro. H2O + methyl salicylate = H(+) + methanol + salicylate Esterase activity is down-regulated by salicylic acid (SA). Plant hormone biosynthesis. A number of isoforms are produced. According to EST sequences. Belongs to the AB hydrolase superfamily. Methylesterase family.