Abstract
A screening of several Chinese medicinal herbs for nematicidal properties showed that Arisaema erubescens (Wall.) Schott tubers possessed significant nematicidal activity against the root-knot nematode (Meloidogyne incognita). From the ethanol extract, two nematicidal flavone-C-glycosides were isolated by bioassay-guided fractionation. The compounds were identified as schaftoside and isoschaftoside on the basis of their phytochemical and spectral data. Schaftoside and isoschaftoside possessed strong nematicidal activity against M. incognita (LC50 = 114.66 μg/mL and 323.09 μg/mL, respectively) while the crude extract of A. erubescens exhibited nematicidal activity against the root-knot nematode with a LC50 value of 258.11 μg/mL.
Highlights
IntroductionPlant-parasitic nematodes are responsible for substantial economic losses to agricultural crops
Plant-parasitic nematodes are responsible for substantial economic losses to agricultural crops.Nematode management is generally based upon chemical treatments, but environmental concerns and governmental regulations [1] are resulting in a strong interest in nematicides of natural origin [2,3]
We report the isolation and characterization of two natural compounds flavone-C-glycosides obtained from A. erubescens tubers by bioassay-guided fractionation and their nematocidal assessment against M. incognita
Summary
Plant-parasitic nematodes are responsible for substantial economic losses to agricultural crops. During our screening program for new agrochemicals from local wild plants and Chinese medicinal herbs, an ethanol extract of Chinese Arisaema erubescens (Wall.) Schott (Chinese cobra lily, Family: Araceae) tubers was found to possess strong nematicidal activity against the root-knot nematode, Meloidogyne incognita (Kofoid and White) Chitwood. Meloidogyne incognita is the most economically important and widely distributed nematode throughout China and a cause of considerable crop losses. Due to the fact that it is a common Chinese herb used in medicine, the chemical constituents and bioactivities of A. erubescens tubers have been extensively studied and the known chemical constituents of this medicinal herb include calcium oxalate, paeonol, aurantiamide acetate, monoterpenoids, fatty acids, flavonoids, and alkaloids [14,15,16,17,18,19,20]. No bioactive compounds against nematodes have been isolated and identified from this Chinese medicinal herb. We report the isolation and characterization of two natural compounds flavone-C-glycosides obtained from A. erubescens tubers by bioassay-guided fractionation and their nematocidal assessment against M. incognita
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