Plant virus infection modifies plant pigment and manipulates the host preference behavior of an insect vector,Entomologia Experimentalis et Applicata

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Plant virus infection modifies plant pigment and manipulates the host preference behavior of an insect vector
Entomologia Experimentalis et Applicata ( IF 1.4 ) Pub Date : 2020-07-16 , DOI: 10.1111/eea.12944
Pedram Moeini ₁ , Alireza Afsharifar ₁ , Mohammad Homayoonzadeh ₂ , Richard J. Hopkins ₃

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Insect‐borne plant viruses may modify the phenotype of their host plants and thus influence the responses of insect vectors. When a plant virus modifies host preference behavior of a vector, it can be expected to influence the rate of virus transmission. In this study, we examined the effect of Maize Iranian mosaic virus (MIMV) infection on host preference behavior of the nymphs and adults of its vector, the small brown planthopper, Laodelphax striatellus Fallén (Hemiptera: Delphacidae), feeding on barley plants (Hordeum vulgare L., Poaceae). We found that both viruliferous nymphs and adults significantly preferred healthy plants, whereas non‐viruliferous planthoppers preferred virus‐infected barley. Further investigations revealed significant reductions in the chlorophyll and carotenoid contents of infected barley leaves. Based on these results, a possible association between insect host preferences and the pigment contents of the plants was observed. In summary, we suggest that host preference of L. striatellus could be affected by the propagative plant virus, possibly through association of this modification with some phenotypic traits of infected plants. These effects may have a critical impact on MIMV transmission rate, with significant implications for the development of virus epidemics.

中文翻译：

植物病毒感染改变植物色素并操纵昆虫载体的宿主偏好行为

昆虫传播的植物病毒可能会改变其宿主植物的表型，从而影响昆虫载体的反应。当植物病毒改变载体的宿主偏好行为时，可以预期它会影响病毒传播的速度。在这项研究中，我们研究了玉米伊朗花叶病毒 (MIMV) 感染对其媒介的若虫和成虫的寄主偏好行为的影响，即以大麦植物（Hordeum vulgare L.，禾本科）。我们发现带毒若虫和成虫都显着偏爱健康的植物，而不带病毒的飞虱则偏爱受病毒感染的大麦。进一步的调查显示，受感染的大麦叶子的叶绿素和类胡萝卜素含量显着减少。基于这些结果，观察到昆虫寄主偏好与植物色素含量之间可能存在关联。总之，我们认为 L. striatellus 的宿主偏好可能受到繁殖植物病毒的影响，可能是通过这种修饰与受感染植物的某些表型特征相关联。这些影响可能对 MIMV 传播率产生关键影响，对病毒流行的发展具有重大影响。

更新日期：2020-07-16

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