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首页> 外文期刊>Environmental Entomology >The Effect of Seston on Mortality of Simulium vittatum (Diptera: Simuliidae) From Insecticidal Proteins Produced by Bacillus thuringiensis subsp israelensis
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The Effect of Seston on Mortality of Simulium vittatum (Diptera: Simuliidae) From Insecticidal Proteins Produced by Bacillus thuringiensis subsp israelensis

机译：芝麻素对苏云金芽孢杆菌亚种以色列产的杀虫蛋白中Sim壳死亡率的影响

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Water was collected from a site on the Susquehanna River in eastern Pennsylvania, where less-than-optimal black fly larval mortality had been occasionally observed after treatment with Bacillus thuringiensis subsp. israelensis de Barjac insecticidal crystalline proteins (Bti ICPs). A series of experiments was conducted with Simulium vittatum Zetterstedt larvae to determine the water related factors responsible for the impaired response to Bti ICPs (Vectobac 12S, strain AM 65-52). Seston in the water impaired the effectiveness of the ICPs, whereas the dissolved substances had no impact on larval mortality. Individual components of the seston then were exposed to the larvae followed by exposure to Bti ICPs. Exposure of larvae to selected minerals and nutritive organic material before ICP exposure resulted in no significant decrease in mortality. Exposure of larvae to silicon dioxide, cellulose, viable diatoms, and purified diatom frustules before Bti ICP exposure resulted in significant reductions in mortality. Exposure of larvae to purified diatom frustules from Cyclotella meneghiniana Kutzing resulted in the most severe impairment of mortality after Bti ICP exposure. It is postulated that frustule-induced impairment of feeding behavior is responsible for the impairment of larval mortality.
机译：从宾夕法尼亚州东部的萨斯奎哈那河上的一个地方收集了水，在用苏云金芽孢杆菌亚种处理后，偶尔观察到黑蝇幼虫的死亡率低于最佳。以色列的Barjac杀虫晶体蛋白（Bti ICPs）。用Simulium v​​ittatum Zetterstedt幼虫进行了一系列实验，以确定与水有关的因素，这些因素与对Bti ICPs的响应减弱有关（Vectobac 12S，菌株AM 65-52）。水中的硒会损害ICP的有效性，而溶解的物质对幼虫死亡率没有影响。然后，将幼虫的各个成分暴露于幼虫，然后暴露于Bti ICP。在ICP接触之前，将幼虫接触选定的矿物质和营养性有机物质不会导致死亡率显着降低。在Bti ICP暴露之前，将幼虫暴露于二氧化硅，纤维素，活的硅藻和纯化的硅藻壳中会导致死亡率显着降低。幼虫暴露于来自米氏Cyclotella meneghiniana Kutzing的纯化的硅藻壳中，导致Bti ICP暴露后死亡率的最严重损害。据推测，由果壳引起的进食行为障碍是造成幼虫死亡率下降的原因。

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