Postharvest UV-B Irradiation Stimulated Ginsenoside Rg 1 Biosynthesis through Nitric Oxide (NO) and Jasmonic Acid (JA) in Panax quinquefolius Roots

The study highlights the influence and signal transduction mechanism of postharvest UV-B on the production of Rg₁ in <i>Panax quinquefolius</i> roots during the drying process. The results showed that postharvest UV-B irradiation induced generation of nitric oxide (NO), jasmonic acid (JA), and ginsenoside Rg₁ of <i>P. quinquefolius</i> roots. The UV-B-induced increase of Rg₁ was suppressed by NO-specific scavenger (cPTIO) and NOS inhibitors (PBITU), JA synthesis inhibitor (SHAM), and JA synthesis inhibitor (PrGall), indicating that NO and JA played essential parts in UV-B-induced Rg₁. External NO inhibitors treatment inhibited UV-B-induced accumulation of NO and JA, which suggested that NO was located upstream of the JA signal pathway. NO-caused Rg₁ was inhibited by SHAM and PrGall, implying JA participated in transmitting signal NO to Rg₁ accumulation. In other words, NO mediated the postharvest UV-B-induced Rg₁ accumulation by the JA-dependent pathway in <i>P. quinquefolius</i> roots during the drying process, which helps us understand the underlying mechanisms involved in UV-B-induced Rg₁ production and provides information helpful for <i>P. quinquefolius</i> production.

Abstract licence: CC BY

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