Phytochemical variation mediates the susceptibility of insect herbivores to entomoviruses

文献类型： 外文期刊

第一作者： Wan, N. -F.

作者： Wan, N. -F.;Li, X.;Guo, L.;Ji, X. -Y.;Zhang, H.;Chen, Y. -J.;Jiang, J. -X.;Wan, N. -F.

作者机构：

关键词： beet armyworm; biological control; chemical ecology; foliar chemicals; host plants; nucleopolyhedrovirus

期刊名称：JOURNAL OF APPLIED ENTOMOLOGY （ 影响因子：2.603； 五年影响因子：2.562 ）

ISSN： 0931-2048

年卷期： 2018 年 142 卷 7 期

页码：

收录情况： SCI

摘要： It has been reported that the susceptibility of insect herbivores to entomoviruses is affected by phytochemicals ingested during the acquisition of viral inoculum on the foliage of host plants. However, the relationship between this susceptibility and phytochemicals is poorly understood. To test this hypothesis of plant-mediated effects on this susceptibility, we measured the effects of foliage from three plants, soybeans (Glycine max), collards (Brassica oleracea) and water convolvuluses (Ipomoea aquatica), on the susceptibility of larval beet armyworm (Spodoptera exigua) to nucleopolyhedrovirus (NPV), and analysed six foliar chemicals (total phenolics, peroxidase [POD], catalase [CAT], superoxide dismutase [SOD], endochitinase and exochitinase) in the three plants, respectively. The results of exponential modelling indicated that the LD50s (median lethal dose) of NPV to larvae increased with the increase in both phenolics and POD but declined with the increase in four other foliar chemicals, while the opposite trend was found between median lethal time (LT50) of NPV and the six foliar chemicals. This study reveals that phenolics and POD decrease host susceptibility to the entomoviruses and that CAT, SOD, endochitinase and exochitinase increase this susceptibility.

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