Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae) is a major pest of several agricultural crops, being vector of an extreme number of viruses. The broad variety of host plants, high adaptability and evolution of resistance to insecticides evidence the difficult in the management of B. tabaci in the agriculture system. Host plant resistance is a valuable and sustainable method of insect management. To date, few studies have characterized the resistance of cucumber (Cucumis sativus L.) genotypes to B. tabaci, although this plant is one of the most preferred host of this hemipteran. The objective of this study was to assess the resistance of 60 cucumber genotypes against B. tabaci in greenhouse and laboratory conditions and to characterize the mechanisms of resistance involved based on morphological and physical plant parameters. Initially, 12 genotypes were selected in a screening bioassay. In general, ‘IAC-1214’ expressed high levels of antixenosis to the insect, causing low attractiveness to adults and non-preference for oviposition and colonization. 'Wellington' prolonged the development of the insect and provoked low levels of adult emergence, expressing levels of antibiosis. Antibiosis and/or antixenosis were detected in ‘IAC-1201’, ‘Campeiro’, ‘Japonês’, and ‘IAC-1311’, while antixenosis was detected in ‘Kyria’ and ‘IAC-1175’. The density of the trichomes and the color of the leaves are described and discussed here. The selected genotypes present potential application in integrated programs that focus on reducing populations of B. tabaci in the agricultural system and in breeding programs aiming to explore resistant genotypes against the insect.

中文翻译：

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黄瓜基因型对烟粉虱（半翅目：粉虱科）抗性的特征和潜在机制

Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae) 是几种农作物的主要害虫，是极端数量病毒的载体。寄主植物种类繁多、适应性强以及对杀虫剂的抗性进化证明了农业系统中烟粉虱的管理难度。寄主植物抗性是一种有价值且可持续的昆虫管理方法。迄今为止，很少有研究描述黄瓜 (Cucumis sativus L.) 基因型对烟粉虱的抗性，尽管这种植物是这种半翅目昆虫的最优选宿主之一。本研究的目的是评估 60 种黄瓜基因型在温室和实验室条件下对烟粉虱的抗性，并根据植物的形态和物理参数表征所涉及的抗性机制。原来，在筛选生物测定中选择了 12 种基因型。一般来说，“IAC-1214”对昆虫表现出高水平的抗排毒作用，导致对成虫的吸引力低，不喜欢产卵和定植。“惠灵顿”延长了昆虫的发育，并引起了成虫出现的低水平，表现出抗菌水平。在“IAC-1201”、“Campeiro”、“Japonês”和“IAC-1311”中检测到抗生素和/或抗毒素，而在“Kyria”和“IAC-1175”中检测到抗毒素。这里描述和讨论了毛状体的密度和叶子的颜色。选定的基因型在专注于减少农业系统中烟粉虱种群的综合计划和旨在探索对昆虫的抗性基因型的育种计划中具有潜在应用。