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Salicylic acid (SA) is an elicitor to induce the biosynthesis of secondary metabolites in plant cells. Hydrogen peroxide (H 2 O 2 ) plays an important role as a key signaling molecule in response to various stimuli and is involved in the accumulation of secondary metabolites. However, the relationship between them is unclear and their synergetic functions on accumulation of secondary metabolites are unknown. In this paper, the roles of SA and H 2 O 2  in rosmarinic acid (RA) production in  Salvia miltiorrhiza  cell cultures were investigated. The results showed that SA significantly enhanced H 2 O 2  production, phenylalanine ammonia-lyase (PAL) activity, and RA accumulation. Exogenous H 2 O 2  could also promote PAL activity and enhance RA production. If H 2 O 2  production was inhibited by NADPH oxidase inhibitor (IMD) or scavenged by quencher (DMTU), RA accumulation would be blocked. These results indicated that H 2 O 2  is secondary messenger for signal transduction, which can be induced by SA, significantly and promotes RA accumulation.

Hydrogen Peroxide Is Involved in Salicylic Acid-Elicited Rosmarinic Acid Production inSalvia miltiorrhizaCell Cultures