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| 1 | 烟芽夜蛾囊泡病毒3h株编码的3H-117蛋白能干扰AcMNPV的口服活性显示文摘【目的】囊泡病毒是一类体液传播的昆虫病毒,具有特殊的致病历程和良好的生防应用潜力。烟芽夜蛾囊泡病毒3h株(Heliothis virescens ascovirus 3h,HvAV-3h)是我国分离的第一株囊泡病毒,其编码的3H-117蛋白被报道为HvAV-3h病毒粒子的结构蛋白。【方法】为了进一步探究3h-117基因的功能,本研究以Bac-to-Bac昆虫表达系统为研究平台,将3h-117插入到苜蓿银纹夜蛾核型多角体病毒(Autographa californica multiple nuclepolyhedrovirus,AcMNPV)的基因组中,成功构建了具有口服活性的重组病毒AcMNPV-117。【结果】通过与野生型病毒(AcMNPV-Egfp)的比较,证实在感染Sf9细胞72–96 h后,AcMNPV-117的出芽型病毒粒子产量以及病毒DNA的拷贝数显著降低,且AcMNPV-117的多角体明显增大。进一步的生测结果表明,AcMNPV-117对三龄甜菜夜蛾(Spodoptera exigua)的90%致死浓度明显高于AcMNPV-Egfp。此外,被病毒感染的甜菜夜蛾幼虫生长相对健康幼虫明显减缓,且试虫的日均取食量也因病毒的感染而被抑制。共聚焦结果表明,3H-117与AcMNPV-117感染后宿主细胞核骨架的聚集过程相关,提示3H-117在囊泡病毒感染过程中可能具有瓦解宿主细胞核的功能。【结论】本研究的结果进一步验证了3h-117的功能,为囊泡病毒的分子生物学研究奠定了基础。 | 李诗薇 欧阳依依 杨长锦 童悦 甘佳敏 黄国华 于欢 | 2022 | 微生物学报2022，62，1： | 1 |
| 2 | Novel strategies for the biocontrol of noctuid pests(Lepidoptera)based on improving ascovirus infectivity using Bacillus thuringiensis显示文摘ldentifying novel biocontrol agents and developing new strategies are urgent goals in insect pest biocontrol.Ascoviruses are potential competent insect viruses that may be developed into bioinsecticides,but this aim is impeded by their poor oral infectivity.To improve the per os infectivity of ascovirus,Bacillus thuringiensis kurstaki(Btk)was employed as a helper to damage the midgut of lepidopteran larvae(Helicoverpa armigera,Mythimna separata,Spodoptera frugiperda,and S.litura)in formulations with Heliothis virescens ascovirus isolates(HvAV-3h and HvAV-3j).Btk and ascovirus mixtures(Btk/HvAV-3h and B1k/HvAV-3j)were fed to insect larvae(3rd instar).With the exception of S.frugiperda larvae,which exhibited low mortality after ingesting Btk,the larvae of the other tested species showed three types of response to feeding on the formulas:type I,the tested larvae(H.armigera)were killed by Btk infection so quickly that insufficient time and resources remained for ascoviral invasion;type II,both Btk and the ascovirus were depleted by their competition,such that neither was successfully released or colonized the tissue;type II,Btk was eliminated by the ascovirus,and the ascovirus achieved systemic infection in the tested larvae.The feeding of Btk/ascovirus formulas led to a great reduction in larval diet consumption and resulted in a significant decrease in the emergence rate of H.armigera,M.separata,and S.litura larvae,which suggested that the formulas exerted marked oral control effects on both the contemporary individuals and the next generation of these tested pest species. | Huan Yu Chang-Jin Yang Ni Li Ying Zhao Zhuang-Mei Chen Si-Jia Yi Zi-Qi Li Michael J.Adang Guo-Hua Huang | 2021 | Insect Science2021，28，5： | 0 |
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