Abstract：
:Although there have been many reports on the synergistic interactions among the major constituents of plant essential oils regarding insecticidal activity, their underlying mechanism of synergy is poorly understood. In our previous studies, we found each of the two most abundant constituents of rosemary (Rosmarinus officinalis L.), thyme (Thymus vulgaris L.) and lemongrass (Cymbopogon citratus Stapf.) essential oils can be synergistic against the larvae of the cabbage looper, Trichoplusia ni at their natural proportion or equivalent blending ratios. In the present study, we investigated whether the enhanced toxicity between the major constituents could be the result of inhibited enzyme activity of cytochrome P450s, general esterases or glutathione S-transferases which are highly related to the development of insecticide resistance. Overall, although some combinations showed mild inhibitory activity, at least for these essential oils and their major constituents, inhibition of detoxication enzyme activity is unlikely to be a direct cause of increased toxicity in the cabbage looper. The results point to other factors, such as multiple modes-of-action or enhanced penetration through the cuticular layer, playing important roles in the elevated insecticidal activity. Moreover, application of enzyme inhibitors sometimes resulted in decreased activity when mixed with the target compounds, but these antagonistic interactions disappeared when they were applied separately, suggesting that the enzyme inhibitors can sometimes influence the penetrations of toxicants.
journal_name
Pestic Biochem Physioljournal_title
Pesticide biochemistry and physiologyauthors
Tak JH,Jovel E,Isman MBdoi
10.1016/j.pestbp.2017.01.012subject
Has Abstractpub_date
2017-08-01 00:00:00pages
9-16eissn
0048-3575issn
1095-9939pii
S0048-3575(16)30187-0journal_volume
140pub_type
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