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Chemical composition, insecticidal and allelopathic properties of essential oils obtained from wild and cultivated Moroccan Satureja calamintha (L.)

2023; Elsevier BV; Volume: 3; Linguagem: Inglês

10.1016/j.napere.2023.100021

2773-0786

Imane Abbad, Bouchra Soulaimani, Abdelaziz Abbad,

Allelopathy and phytotoxic interactions

This study aimed to investigate the chemical composition and biopesticide potential of essential oils (EOs) obtained from wild and cultivated Moroccan Satureja calamintha. GC/MS analysis revealed the presence of 15 compounds, accounting for 99.88% and 98.14% of the total oils obtained from wild and cultivated plants, respectively. Pulegone (72.93–68.58%), menthone (12.07–10.15%), and menthol (6.31–9.83%) were found as the main constituents of S. calamintha EOs. The results showed that cultivation of the species induced an accumulation of menthol and inversely a decrease of pulegone content. The insecticidal assays showed that both oils obtained from wild and cultivated plant exhibited strong toxicity towards the three insects tested (Tribolium confusum (Duv.) Rhyzopertha dominica (F.) and Sitophilus oryzae (L.)), and that for the two tested methods (LD50 ranged from 0.004 µL/cm2 to 0.011 µL/cm2 and from 1.988 µL/L to 10.817 µL/L, for contact and fumigant bioassays, respectively). Except for Sitophilus oryzae in the fumigation bioassay, it appears that cultivation did not significantly affect the insecticidal property of Satureja calamintha EO. The allelopathic assays showed that both oils presented an inhibitory effect on the seed germination and primary seedling growth of the two weedy species studied. This effect appears more pronounced against Carrichtera annua (L.) DC. Comparing the allelopathic effects of the two oils, it appears that no significant difference has been observed. From this work, it can be concluded that both EOs obtained from wild and cultivated Satureja calamintha may constitute a promising biopesticide agent.