Development of Root Gravitropism Inhibitors from Allelochemical Research

Plants frequently rely on chemically mediated interactions—collectively known as allelopathy—to secure their ecological niche, and the small molecules involved in these processes often provide valuable leads for both biological studies and agrochemical development. Among such metabolites, cis-cinnamic acid, originally identified as the aglycone of cis-cinnamic acid glycosides from Spiraea thunbergii, exerts a pronounced effect on root growth. Motivated by this activity, our interdisciplinary team synthesized cis-cinnamic acid and a series of structural variants, ultimately creating a fluorescent derivative that enabled visualization of its preferential accumulation in the root cap.