Activities of Digestive Enzymes in the Omnivorous Pest Apolygus lucorum (Hemiptera: Miridae)

文献类型： 外文期刊

第一作者： Yuan, Wei

作者： Yuan, Wei;Wu, Kongming;Zhao, Xincheng

作者机构：

关键词： Apolygus lucorum;digestive enzyme;salivary gland complex;midgut;diet

期刊名称：JOURNAL OF ECONOMIC ENTOMOLOGY （ 影响因子：2.381； 五年影响因子：2.568 ）

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收录情况： SCI

摘要： The mirid bug Apolygus lucorum Meyer-Dur, 1843, an omnivorous species that feeds on plants and animals, has become a major pest in China as production of Bt-cotton has grown to such a large scale. Its omnivory is likely to be critical for its success, but the digestive mechanism(s) underlying processing and adsorption of such diverse foods is relatively unknown. Here, we examined the activities of digestive enzymes of A. lucorum in the salivary gland complex and midgut and the effect of sex, age, and food source on these activities. Amylase and protease were present in the salivary gland complex and the midgut, but were higher in the salivary gland complex. Trypsin-like enzyme was also present in both organs, but chymotrypsin-like enzyme was present only in the midgut. Sex, age, and food source affected the activities of these digestive enzymes. In general, the activities of these enzymes peaked at 10 d after emergence, and amylase and protease activities were higher in female adults than in males. Of the food sources tested, green bean pods (Gb) induced the highest amylase activity, whereas Helicoverpa armigera Hubner, 1809 eggs (He) and a mixture of Gb and He induced higher activities of the trypsin- like and chymotrypsin-like enzymes. The results from food switching experiments confirmed that amylase activity could be induced by plant sources, and animal sources induced protease activity. Thus, the types and activities of digestive enzymes in A. lucorum provide the physiological basis of the pest's omnivory.

分类号： Q969.9

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