?Three hemiparasitic plant species from the family Orobanchaceae, namely Parentucellia viscosa (L.) Caruel., Bellardia trixago (L.) All. and P. latifolia (L.) Caruel., have invaded Japan. These three species possess glandular trichomes secreting exudates on leaf surfaces. Exudates were collected by rinsing aerial parts with dichloromethane, and the residues were extracted with methanol. Both dichloromethane and methanol extracts were tested for their antifeedant activity against Spodoptera litura larvae. A diterpene, kolavenic acid isolated from the exudate of P. viscosa showed a significant antifeedant activity, whereas other diterpenes from B. trixago and P. latifolia exudates did not. On the other hand, bartsioside and aucubin from B. trixago methanol extract showed toxicity against S. litura larvae. Also, the iridoid glucoside, mussaenoside from the P. viscosa methanol extract showed a plant growth inhibitory activity against lettuce and Italian ryegrass seedlings. These results suggest that iridoids contribute to the expanded habitat of the hemiparasitic plants.

Diterpenes and iridoid glucosides from <i>Orobanchaceae</i> and their biological activities

248th National Meeting (2014)

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Diterpenes and iridoid glucosides from Orobanchaceae and their biological activities