A1-Phytoprostane-I

A1-Phytoprostane-I is a cyclopentenone isoprostane formed from α-linolenic acid under oxidative stress in plants. This specific isoform, resulting from 9,13-cyclization, functions as a signaling molecule that upregulates genes for glutathione-S-transferase and phytoalexin biosynthesis, making it a valuable tool for studying plant stress responses and secondary metabolism in vivo and in vitro.