Toxoptera aurantii is one of the most destructive pests, threatening the yield and quality of tea plantations. The salicylic acid (SA)-mediated signaling pathway is vital for the induction of plant defense responses; however, its role in tea plant resistance to T. aurantii remains unclear. Thus, this study used and electrical penetration graph and monitoring of population dynamics to evaluate the effects of exogenous SA application on T. aurantii feeding behavior and population growth in tea seedlings. Moreover, the effects of SA treatment on the activities of defense-related enzymes were analyzed. Probe counts and the duration of xylem sap ingestion were significantly higher in SA-treated plants than those in the control group. The total duration of passive phloem ingestion was significantly decreased in 0.5 mmol/l SA-treated plants, and the application of 0.5, 1, and 4 mmol/l SA significantly inhibited T. aurantii population growth. In addition, the activities of polyphenol oxidase, peroxidase, and superoxide dismutase were significantly increased in the 0.5 mmol/l SA-treated plants. Overall, this study demonstrates the capacity of exogenous SA to activate defense responses against T. aurantii. These results have crucial implications for understanding the mechanisms of enhanced resistance, thereby providing a sustainable approach for managing T. aurantii.

中文翻译：

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外源水杨酸诱导茶树对抗橙翅弓翅目（半​​翅目：蚜科）的防御反应

橙翅弓翅虫是最具破坏性的害虫之一，威胁着茶园的产量和质量。水杨酸（SA）介导的信号通路对于诱导植物防御反应至关重要；然而，其在茶树抗性中的作用仍不清楚。因此，本研究利用电穿透图和种群动态监测来评估外源SA应用对茶树幼苗中枳壳取食行为和种群生长的影响。此外，还分析了SA处理对防御相关酶活性的影响。SA处理的植物中的探针计数和木质部汁液摄取的持续时间显着高于对照组。0.5 mmol/l SA 处理的植物中被动韧皮部摄取的总持续时间显着减少，并且施用 0.5、1 和 4 mmol/l SA 显着抑制 T. aurantii 种群生长。此外，0.5 mmol/l SA处理的植物中多酚氧化酶、过氧化物酶和超氧化物歧化酶的活性显着增加。总体而言，本研究证明了外源 SA 激活针对 T. aurantii 的防御反应的能力。这些结果对于理解增强抗性的机制具有重要意义，从而为管理橙子木霉提供了可持续的方法。