Selection for tolerance to volatile monoterpenoids in Sitophilus oryzae (L.), Rhyzopertha dominica (F.) and Cryptolestes pusillus (Schönherr) |
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| Authors: | MD López J Contreras |
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| Affiliation: | a Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), C/Mayor s/n, 30150 La Alberca, Murcia, Spain
b Department Producción Vegetal, ETSIA, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203 Cartagena, Spain |
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| Abstract: | Selection for tolerance to 8 monoterpenoids (linalool, camphor, γ-terpinene, S-carvone, geraniol, estragole, E-anethole, and fenchone) in three pests of stored rice, Sitophilus oryzae, Rhyzopertha dominica and Cryptolestes pusillus, as well as the metabolic mechanisms implicated, was studied. Strains were selected for tolerance towards each monoterpenoid from susceptible insect populations for each of seven generations.After selection, tolerance was observed towards linalool, S-carvone and estragole in S. oryzae and towards camphor in C. pusillus. Populations of R. dominica were not observed to develop tolerance to monoterpenoids.The activity of three enzymatic systems detoxifying these monoterpenoids, microsomal P-450 monooxygenase, esterase, and glutathione S-transferase (GST), were analyzed to study the metabolic mechanisms involved. Esterases could be involved in S. oryzae tolerance whereas P-450 monooxygenases could be involved for most monoterpenoids in selected populations of R. dominica and C. pusillus. |
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| Keywords: | Linalool S-carvone Estragole E-anethole Fenchone Monoterpenoid tolerance Synergism Detoxification |
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