Abstract
PB90 is a novel protein elicitor isolated from Phytophthora boehmeriae. Here, we report that treatment of PB90 stimulates hypericin production and hydrogen peroxide (H2O2) generation in Hypericum perforatum L. cells and demonstrate that H2O2 is essential for PB90-induced hypericin production. To further study the source of PB90-triggered H2O2, we have investigated activities of plasma membrane NADPH oxidase in Hypericum perforatum L. cells subjected to PB90 treatment. It is revealed that treatment of the cells with PB90 significantly increases NADPH oxidase activity. NADPH oxidase inhibitors suppress not only the PB90-stimulated NADPH oxidase activity but also the PB90-triggered H2O2 generation and PB90-induced hypericin production, showing that NADPH oxidase is involved in PB90-triggered H2O2 generation and hypericin production. Moreover, the suppression of NADPH oxidase inhibitors on PB90-induced hypericin production can be reversed by H2O2, although H2O2 per se has no effects on hypericin production of the cells. Together, the data demonstrate that PB90 may induce hypericin production of H. perforatum cells through the NADPH oxidase-mediated H2O2 signaling pathway.
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