Reduced insect pest populations found on long-term organic farms have mostly been attributed to increased biodiversity and abundance of beneficial predators, as well as to changes in plant nutrient content. However, the role of plant resistance has largely been ignored. Here, we determine whether host plant resistance mediates decreased pest populations in organic systems and identify potential underpinning mechanisms. We demonstrate that fewer numbers of leafhoppers (Circulifer tenellus) settle on tomatoes (Solanum lycopersicum) grown using organic management as compared to conventional. We present multiple lines of evidence, including rhizosphere soil microbiome sequencing, chemical analysis and transgenic approaches, to demonstrate that changes in leafhopper settling between organically and conventionally grown tomatoes are dependent on salicylic acid accumulation in plants and mediated by rhizosphere microbial communities. These results suggest that organically managed soils and microbial communities may play an unappreciated role in reducing plant attractiveness to pests by increasing plant resistance.

中文翻译：

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有机管理通过改变植物对昆虫的抵抗力来促进自然害虫控制。

在长期有机农场中发现的害虫数量减少主要归因于生物多样性的增加和有益捕食者的丰富，以及植物养分含量的变化。然而，植物抗性的作用在很大程度上被忽视了。在这里，我们确定宿主植物抗性是否介导有机系统中害虫数量的减少，并确定潜在的支撑机制。我们证明，与常规管理相比，使用有机管理种植的番茄（番茄）上的叶蝉（Circulifer tenellus）数量较少。我们提出了多条证据，包括根际土壤微生物组测序、化学分析和转基因方法，证明有机和常规种植番茄之间叶蝉沉降的变化取决于植物中水杨酸的积累，并由根际微生物群落介导。这些结果表明，有机管理的土壤和微生物群落可能在通过增加植物抗性来降低植物对害虫的吸引力方面发挥着未被重视的作用。