Host plant defenses of black (Solanum nigrum L.) and red nightshade (Solanum villosum Mill.) against specialist Solanaceae herbivore Leptinotarsa decemlineata (Say)

Black nightshade (Solanum nigrum, S. nigrum L.) and red nightshade ( Solanum villosum, S. villosum Mill.) are medicinal plants from the Solanaceae family that synthesize glycoalkaloids and other secondary metabolites. To recognize the potential insecticide activity of these compounds, leaf extracts...

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Bibliographic Details
Published in:Archives of insect biochemistry and physiology 2019-06, Vol.101 (2), p.e21550-n/a
Main Authors: Ben‐Abdallah, Saoussen, Cáceres, Luis A., Wang, Zhiling, Renaud, B. Justin, Lachâal, Mokhtar, Karray‐Bouraoui, Najoua, Hannoufa, Abdelali, Scott, Ian M.
Format: Article
Language:English
Subjects:
Acetic acid
antifeedant activity
Bioassays
Glutathione
glutathione S‐transferase
Glycoalkaloids
green leaf volatiles Leptinotarsa decemlineata
Herbal medicine
Host plants
Inhibition
Insecticide resistance
Insecticides
Larvae
Leaves
Leptinotarsa decemlineata
Medicinal plants
Metabolites
Methanol
Midgut
Mortality
Plant extracts
Potatoes
Secondary metabolites
Solanaceae
Solanum
Solanum nigrum
Solanum villosum
Toxicity
Volatile compounds
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Summary:Black nightshade (Solanum nigrum, S. nigrum L.) and red nightshade ( Solanum villosum, S. villosum Mill.) are medicinal plants from the Solanaceae family that synthesize glycoalkaloids and other secondary metabolites. To recognize the potential insecticide activity of these compounds, leaf extracts (containing glycoalkaloid and methanol fractions) were tested for enzyme inhibition, antifeedant activity and toxicity. For in‐vitro glutathione S‐transferase (GST) inhibition activity, we used insecticide‐resistant Colorado potato beetle, Leptinotarsa decemlineata ( L. decemlineata; Say) midgut and fat‐body homogenate. In‐vivo toxicity and the antifeedant activity were performed using larval bioassays. The methanol extracts had greater GST inhibitory activity compared to the glycoalkaloids, as well as greater 2nd instar larvae mortality and antifeedant activity. Furthermore, the green leaf volatile compound, cis‐hex‐3‐enyl acetate, at the concentration of 5 ppm, caused 50% mortality of 2nd instar larvae. Our findings suggest the potential usefulness of S. nigrum and S. villosum extracts to control L. decemlineata. Image 1. Toxicity and antifeedant activity of Solanum spp. secondary metabolites against Colorado potato beetle larvae
ISSN:0739-4462
1520-6327
DOI:10.1002/arch.21550