Activity changes of antioxidant and detoxifying enzymes in Tenebrio molitor (Coleoptera: Tenebrionidae) larvae infected by the entomopathogenic nematode Heterorhabditis beicherriana (Rhabditida: Heterorhabditidae)
文献类型： 外文期刊
作者： Li, Xingyue 2 ; Liu, Qizhi 1 ; Lewis, Edwin E. 3 ; Tarasco, Eustachio 4 ;
作者机构： 1.China Agr Univ, Dept Entomol, Coll Plant Protect, Beijing 100193, Peoples R China
2.Sichuan Acad Agr Sci, Inst Plant Protect, Chengdu 610066, Peoples R China
3.Univ Calif Davis, Dept Entomol & Nematol, Davis, CA 95616 USA
4.Univ Bari Aldo Moro, Dept Soil Plant & Food Sci, I-70126 Bari, Italy
关键词： Entomopathogenic nematode;Tenebrio molitor;Reactive oxygen species;Tyrosinase;Detoxifying enzymes
期刊名称：PARASITOLOGY RESEARCH （ 影响因子：2.289； 五年影响因子：2.403 ）
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收录情况： SCI
摘要： Entomopathogenic nematodes (EPNs) of the genera Steinernema and Heterorhabditis are lethal parasites of many insect species. To investigate defensive mechanisms towards EPNs in relation to antioxidative and detoxifying enzymes, we chose Tenebrio molitor (Coleoptera: Tenebrionidae) as experimental insect. We studied the activity changes of superoxide dismutases (SODs), peroxidases (PODs), and catalases (CATs), as well as tyrosinase (TYR), acetylcholinesterase (AChE), carboxylesterase (CarE), and glutathione S-transferase (GSTs) for 40 h in T. molitor larvae infected with Heterorhabditis beicherriana infective juveniles (IJs) at 5 rates (0, 20, 40, 80, and 160 IJs/larva). We found that when T. molitor larvae infected with H. beicherriana at higher rates (80 and 160 IJs/larva), SOD activity quickly increased to more than 70 % higher than that control levels. The activities of POD and CAT increased after 24 h. TYR activity increased slowly at lower rates of infection for 16 h, followed by a slight decrease, and then increasing from 32 to 40 h. The other detoxifying enzymes (GST, CarE, and AChE) were enhanced at lower infection rates, but were inhibited at higher rates. Our results suggested that host antioxidative response and detoxification reactions played a central role in the defensive reaction to EPNs, and that this stress which was reflected by the higher level enzymes activity contributed to the death of hosts. Further study should explore the exact function of these enzymes using different species of EPNs and investigate the links between enzyme activity and host susceptibility to EPNs.
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