Plant tannins, polyphenolic plant secondary metabolites are involved in important chemical defense processes in plants. In this study, tannic acid was used as the standard of plant tannins to determine the effects on nutritional indices and activities of glutathione S-transferases (GSTs), cytochrome P450 monooxygenase (CYP450), carboxylesterase (CarE), and acetylcholinesterase (AChE) in fourth-instar larvae of Hyphantria cunea (Drury) by feeding on an artificial diet containing tannic acid under different treatments. We found that tannic acid significantly affected the digestive capacity and food utilization rate of H. cunea larvae. A tannic acid concentration of less than 2.0% promoted feeding and the utilization of undesirable food by H. cunea larvae, while inhibitory effects were observed at high concentrations (>2.5%). Tannic acid had a significant effect on the activity of detoxification enzymes and AChE in H. cunea larvae in concentration-dependent and time-dependent manners (P < 0.05). These results provide new insights into the potential mechanisms underlying detoxification in H. cunea larvae against tannic acid in host plants.

中文翻译：

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单宁酸对秋季Webworm（鳞翅目：弓形科）的营养以及解毒酶和乙酰胆碱酯酶活性的影响。

植物丹宁酸，多酚植物次生代谢产物参与植物的重要化学防御过程。在本研究中，使用单宁酸作为植物单宁的标准品，以测定其对谷胱甘肽S-转移酶（GSTs），细胞色素P450单加氧酶（CYP450），羧酸酯酶（CarE）和乙酰胆碱酯酶（AChE）的营养指标和活性的影响。以不同处理方式饲喂含单宁酸的人工饲料饲喂豚鼠（Drury）的四龄幼虫。我们发现单宁酸显着影响了中华绒螯蟹幼虫的消化能力和食物利用率。单宁酸浓度低于2.0％时，可促进饲喂白粉虱幼虫进食和利用不良食物，而在高浓度（> 2.5％）下则有抑制作用。单宁酸以浓度和时间依赖性的方式对豚鼠幼虫的排毒酶和AChE的活性有显着影响（P <0.05）。这些结果提供了新的见解，揭示了H. cunea幼虫针对宿主植物中单宁酸的解毒的潜在机制。