Abstract
Salicylic acid (SA) and methyl salicylate (MeSA) are synthesized in many plants and are crucial components that establish their disease responses. The metabolism of airborne MeSA to SA has been previously reported. In this report, it was found that SA glucose ester (SAGE), ether (SAG), and salicyloyl-L-aspartic acid (SA-Asp) are metabolites of airborne MeSA. Furthermore, it was found that airborne MeSA was able to increase the endogenous amount of rosmarinic acid in Perilla frutescens, which is known as one of the functional components that contributes to the maintenance of human health.
Highlights
Plants have unique and complex chemical systems to act against various stresses, such as biotic and abiotic stresses [1]
There were no other examples of the experimental method that we adopted, so it was unclear whether the plant elicited the wound response in our experimental system
The results supported that the experimental method employed in this study was indicated to be as tolerable as any other study that discusses the metabolism and biological activity of airborne methyl salicylate (MeSA)
Summary
Plants have unique and complex chemical systems to act against various stresses, such as biotic and abiotic stresses [1]. MeSA is synthesized in plants from salicylic acid (SA), and the biosynthesis of SA starts from chorismic acid and is followed by a series of chemical reactions through two distinct pathways: the isochorismate (IC) pathway and the phenylalanine ammonia-lyase (PAL) pathway (Figure 1) [3]. Shulaev et al [13] reported that MeSA was the major volatile compound produced by tobacco plants inoculated with the tobacco mosaic virus. In addition to being a volatile compound, it has been reported that MeSA is a mobile component through the phloem to activate SAR in undamaged leaves [4, 8]. We report the metabolism of airborne MeSA into SAGE, SAG, and SA-Asp using A. thaliana. We proposed that airborne MeSA might be used in agriculture
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