FRE CNRS 3498 EDYSAN (Écologie et Dynamique des Systèmes Anthropisés), Université de Picardie Jules Verne, 33 rue St Leu, 80039, Amiens Cedex, France.
INRA, UMR 0385 BGPI, CIRAD-INRA-Montpellier SupAgro, TA A54/KCampus International de Baillarguet, 34394, Montpellier Cedex 5, France.
Insect Sci. 2019 Feb;26(1):86-96. doi: 10.1111/1744-7917.12508. Epub 2017 Aug 30.
Insect-vectored plant viruses can induce changes in plant phenotypes, thus influencing plant-vector interactions in a way that may promote their dispersal according to their mode of transmission (i.e., circulative vs. noncirculative). This indirect vector manipulation requires host-virus-vector coevolution and would thus be effective solely in very specific plant-virus-vector species associations. Some studies suggest this manipulation may depend on multiple factors relative to various intrinsic characteristics of vectors such as transmission efficiency. In anintegrative study, we tested the effects of infection of the Brassicaceae Camelina sativa with the noncirculative Cauliflower mosaic virus (CaMV) or the circulative Turnip yellows virus (TuYV) on the host-plant colonization of two aphid species differing in their virus transmission efficiency: the polyphagous Myzus persicae, efficient vector of both viruses, and the Brassicaceae specialist Brevicoryne brassicae, poor vector of TuYV and efficient vector of CaMV. Results confirmed the important role of virus mode of transmission as plant-mediated effects of CaMV on the two aphid species induced negative alterations of feeding behavior (i.e., decreased phloem sap ingestion) and performance that were both conducive for virus fitness by promoting dispersion after a rapid acquisition. In addition, virus transmission efficiency may also play a role in vector manipulation by viruses as only the responses of the efficient vector to plant-mediated effects of TuYV, that is, enhanced feeding behavior and performances, were favorable to their acquisition and further dispersal. Altogether, this work demonstrated that vector transmission efficiency also has to be considered when studying the mechanisms underlying vector manipulation by viruses. Our results also reinforce the idea that vector manipulation requires coevolution between plant, virus and vector.
昆虫传播的植物病毒可以诱导植物表型发生变化，从而通过其传播方式（即循环传播与非循环传播）影响植物-媒介的相互作用，促进其扩散。这种间接的媒介操纵需要宿主-病毒-媒介协同进化，因此仅在非常特定的植物-病毒-媒介物种关联中才有效。一些研究表明，这种操纵可能取决于与媒介的多种内在特征（如传播效率）相关的多个因素。在一项综合性研究中，我们测试了感染芸苔属植物荠蓝的非循环传播的花椰菜花叶病毒（CaMV）或循环传播的芜菁黄花叶病毒（TuYV）对两种蚜虫物种在宿主植物上定殖的影响，这两种蚜虫在病毒传播效率上存在差异：多态性桃蚜，这两种病毒的有效媒介，以及芸薹科专食性小菜蛾，TuYV 的低效媒介，CaMV 的高效媒介。结果证实了病毒传播方式的重要作用，因为 CaMV 对两种蚜虫的植物介导效应导致了它们的取食行为（即韧皮部汁液摄入减少）和性能的负向改变，这都有利于病毒的适应性，促进了快速获得后的传播。此外，病毒传播效率也可能在病毒对媒介的操纵中发挥作用，因为只有高效媒介对 TuYV 介导的植物效应的反应，即增强的取食行为和性能，才有利于它们的获得和进一步传播。总之，这项工作表明，在研究病毒介导的媒介操纵机制时，还必须考虑媒介的传播效率。我们的结果还强化了这样一种观点，即媒介操纵需要植物、病毒和媒介之间的共同进化。
