Rice false smut (RFS), caused by Ustilaginoidea virens, is one of the most detrimental rice fungal diseases and pose a severe threat to rice production and quality. Effectors in U. virens often act as a set of essential virulence factors that play crucial roles in the interaction between host and the pathogen. Thus, the functions of each effector in U. virens need to be further explored. Here, a conserved small secreted hypersensitive response-inducing protein (hrip) was named UvHrip1. Functional validation was investigated to prove that UvHrip1 suppressed cell death symptom and ROS accumulation in Nicotiana benthamiana triggered by Burkholderia glumae. We performed transgenic technology to demonstrate UvHrip1 remarkably inhibited pathogen-associated molecular pattern-induced defense responses in Arabidopsis seedlings and plants, including the expression of defense-response genes. Furthermore, disease progression caused by the type III secretion system-defective mutant from Pseudomonas syringae pv. tomato DC3000 was strongly facilitated in transgenic Arabidopsis ectopic expressing UvHrip1. Our data demonstrated UvHrip1 suppresses plant innate immunity and promoting disease multiplication in Arabidopsis.

中文翻译：

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UvHrip1是一种由Ustilaginoidea virens分泌的效应子，可以抑制拟南芥中的基础防御并促进疾病的发展。

稻瘟病菌（Ustilaginoidea virens）引起的稻曲病（RFS）是最有害的稻米真菌病之一，严重威胁稻米的产量和质量。毒株中的效应子通常是一组必需毒力因子，在宿主与病原体之间的相互作用中起着关键作用。因此，需要进一步探索U.virens中每个效应子的功能。在这里，一个保守的小分泌的过敏反应诱导蛋白（hrip）被命名为UvHrip1。研究了功能验证，以证明UvHrip1抑制了由Burkholderia glumae触发的本氏烟草中的细胞死亡症状和ROS积累。我们进行了转基因技术，以证明UvHrip1在拟南芥幼苗和植物中显着抑制病原体相关的分子模式诱导的防御反应，包括防御反应基因的表达。此外，由丁香假单胞菌pv的III型分泌系统缺陷型突变体引起的疾病进展。番茄DC3000在表达UvHrip1的转基因拟南芥异位中得到了大力促进。我们的数据表明，UvHrip1抑制拟南芥中植物的固有免疫力并促进疾病的繁殖。