Amino acid metabolic pathways are involved in the plant immune system. Pipecolic acid (Pip), a lysine‐derived non‐protein amino acid, acts as an important regulator of disease resistance. Here, we report the functions of Pip on tomato disease resistance. Tomato seedlings treated with 0.5 mM Pip showed increased resistance to Pst DC3000 and B. cinerea compared with the control. After pathogen infection, the expression of defence‐related genes increased in plants pretreated with Pip, while reactive oxygen species (ROS) accumulation decreased. These data demonstrated that exogenous application of Pip induced resistance against Pst DC3000 and B. cinerea in tomatoes, possibly through the regulation of ROS accumulation and defence‐related gene expression.

中文翻译：

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哌可酸对灰葡萄孢和丁香假单胞菌诱导抗性的作用。番茄 DC3000 在番茄植株中

氨基酸代谢途径参与植物免疫系统。哌可酸 (Pip) 是一种赖氨酸衍生的非蛋白质氨基酸，是抗病性的重要调节剂。在这里，我们报告了 Pip 对番茄抗病性的作用。与对照相比，用 0.5 mM Pip 处理的番茄幼苗对 Pst DC3000 和 B. cinerea 的抗性增加。病原体感染后，用 Pip 预处理的植物中防御相关基因的表达增加，而活性氧 (ROS) 的积累减少。这些数据表明，外源应用 Pip 诱导了番茄对 Pst DC3000 和 B. cinerea 的抗性，这可能是通过调节 ROS 积累和防御相关基因表达来实现的。