Department of Entomology and Acarology, Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo (USP), Av. Pádua Dias 11, Piracicaba, 13418-900, São Paulo, Brazil.
Department of Biological Sciences, Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo (USP), Av. Pádua Dias 11, Piracicaba, 13418-900, São Paulo, Brazil.
Chemosphere. 2021 Jan;263:127561. doi: 10.1016/j.chemosphere.2020.127561. Epub 2020 Aug 10.
Plants and insects are parts of a complex system that involves interactions among many trophic levels, and it is important to understand the nature of such interactions. In the complex of interactions involving aphids and transgenic cotton expressing Bacillus thuringiensis, both the spraying of neonicotinoids and the occurrence of predatory coccinellids are common. However, there are gaps regarding the knowledge about possible impacts of neonicotinoids on physiological variables of the host plant and behavioural traits of the aphid (Aphis gossypii) and predator (Cycloneda sanguinea). Therefore, this study aimed to highlight the photosynthetic and electrical responses of the plant to the stress caused by the aphid attack combined with the stress generated by the use of imidacloprid in Bt and non-Bt cotton (Gossypium hirsutum L.) cultivars and to evaluate how this stress can influence the behavioural ecology of the predator and prey. Chlorophyll a fluorescence tests, dark respiration and electrophysiology on non-Bt and Bt cotton were carried out, the behaviour of the prey and predator was also evaluated with a video capture system. Our research is a study model that generates insights about possible impacts when using Imidacloprid without the occurrence of the pest on the plant, because the exposure of non-Bt and Bt cotton plants and the predator to imidacloprid unnecessarily, may result in stress on the physiology of the cotton plants and on the behaviour of the predator.
植物和昆虫是一个复杂系统的一部分，涉及许多营养层次之间的相互作用，了解这种相互作用的性质非常重要。在涉及蚜虫和表达苏云金芽孢杆菌的转基因棉花的复杂相互作用中，新烟碱类杀虫剂的喷洒和捕食性瓢虫的发生都很常见。然而，对于新烟碱类杀虫剂可能对宿主植物的生理变量和蚜虫（棉蚜）和捕食者（异色瓢虫）的行为特征产生的影响，我们的知识还存在空白。因此，本研究旨在强调植物对蚜虫攻击引起的胁迫以及Bt 和非 Bt 棉花（棉属）品种中使用吡虫啉产生的胁迫的光合和电反应，并评估这种胁迫如何影响捕食者和猎物的行为生态学。我们对非 Bt 和 Bt 棉花进行了叶绿素 a 荧光测试、暗呼吸和电生理学测试，还使用视频捕获系统评估了猎物和捕食者的行为。我们的研究是一个模型研究，当害虫不在植物上时使用吡虫啉可能会产生影响，因为非 Bt 和 Bt 棉花植物和捕食者不必要地接触吡虫啉，可能会对棉花植物的生理学和捕食者的行为产生压力。
