The impact of co-infection by a nucleopolyhedrovirus and the endoparasitoid Microplitis pallidipes on the total hemocyte count and composition in larval beet armyworm, Spodoptera exigua
文献类型: 外文期刊
作者: Wan, Nian-Feng 1 ; Ji, Xiang-Yun 1 ; Yin, Yang-Yi 1 ; Jiang, Jie-Xian 1 ;
作者机构: 1.Shanghai Acad Agr Sci, Shanghai Key Lab Protected Hort Technol, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China
关键词: granulocytes;immune response;nucleopolyhedrovirus;parasitization;physiological effect;plasmatocyte
期刊名称:BIOCONTROL SCIENCE AND TECHNOLOGY ( 影响因子:1.665; 五年影响因子:1.616 )
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收录情况: SCI
摘要: The physiological effects of nucleopolyhedrovirus (NPV) infection and parasitism by Microplitis pallidipes (Hymenoptera: Braconidae) on the hemocytes of Spodoptera exigua (Lepidoptera: Noctuidae) larvae were examined. We found that compared to healthy (control) larvae, the total hemocyte count (THC) and granulocyte count in parasitized larvae increased 1 day after parasitization and then decreased, while the plasmatocyte count was not significantly affected for the first 5 days but was significantly enhanced on day 6 after parasitization. In parasitized + infected larvae, both the THC and granulocyte counts began be lower from day 1 compared to parasitized larvae, while the plasmatocyte count was generally lower than in parasitized larvae. Compared to the control, THC, and granulocyte counts of virus-infected larvae were higher 1 day after infection. Compared to that in virus-infected larvae, THC and granulocyte counts in parasitized + infected larvae began to decrease from day 1 while the plasmatocyte count generally decreased. We concluded that the host immune response of cell communities to parasitization by M. pallidipes was elicited during the development of the parasitoid egg, but that immune response was inhibited during larval development of parasitoids in the host body. Meanwhile, we found that NPV infection impeded the regulatory effect of M. pallidipes on host cellular immune responses, and parasitization by M. pallidipes similarly inhibited the host cellular immune response caused by NPV infection.
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