Vitis vinifera canes, a source of stilbenoids against Spodoptera littoralis larvae
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Stilbenes are constitutively accumulated in grape canes at a high concentration of about 10 g kg−1 DW. Some of these compounds have antimicrobial activity and are involved in grapevine defence in leaves and fruits, acting as phytoalexins. In this work, we studied their insecticidal effects against Spodoptera littoralis larvae by using an extract from grapevine canes containing 27% (w/w) of total stilbenes and the major ones isolated from this extract (E-piceatannol, E-resveratrol, isohopeaphenol, E-ε-viniferin and E-vitisin B). The stilbenes isolated from the grapevine extract did not show any significant antifeedant effect or acute toxicity, but they did cause chronic mortality to the larvae population of an important polyphagous pest, S. littoralis. The tetramer, E-vitisin B, appeared to be the most effective compound with LC50 and LC90 values of 134 and 298 µg cm−2, respectively. Significant synergic relationships were found between some stilbenes, resulting in a significant increase in the insecticidal efficacy of the mixture of these substances. Taken together, these results suggest that grapevine canes are a good source of active substances for the development of botanical insecticides.
KeywordsNatural insecticides Spodoptera littoralis Cane extract Stilbenes E-ε-viniferin, vitisin B Isohopeaphenol Vitis vinifera L.
The authors would like to thank the Technology Agency of the Czech Republic for their financial support of the botanical pesticide and basic substance research. Financial support for this work was provided by the Technology Agency of the CR (Project No. TA04020103).
The authors also wish to thank the Conseil Regional d’Aquitaine for their financial support in this research. The work was supported by the French National Research Agency (ANR LabCom program, Stilbene Innovation project, ANR-14-LAB5-0005-01), the Bordeaux Metabolome Facility and MetaboHUB (ANR-11-INBS-0010 project).
Compliance with ethical standards
Conflict of interest
The authors declare no competing interests.
This article does not contain any studies with human participants or animals performed by any of the authors.
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