The phytohormones salicylic acid (SA) and jasmonic acid (JA) promote two, mutually antagonistic immune pathways respectively protecting plants from biotrophic pathogens and necrotrophic pathogens or insects. This trade-off largely precludes the exploitation of SA and JA immune components for crop protection, raising the interest in immune signalling components that disrupt SA-JA antagonism. A local pathogen infection primes SA-dependent immunity in systemic tissues. This so-called systemic acquired resistance (SAR) ensures a long-lasting, broad-spectrum disease resistance that is not subject to SA-JA antagonism. Here, we show that two sequence-related LEGUME LECTIN-LIKE PROTEINs (LLPs) promote SAR through spatially separated functions with JA promoting local SAR signal generation through LLP3. In concert with LLP1, which is important for systemic recognition and propagation of SAR signals, LLP3 promotes both SA-dependent SAR and JA-mediated immunity. Thus, exploitation of LLP-associated signalling cues might allow application of plant innate immune signals to promote (crop) plant health.

中文翻译：

---

本地茉莉酸提示驱动系统获得性电阻信号的产生

植物激素水杨酸（SA）和茉莉酸（JA）促进两条相互拮抗的免疫途径，分别保护植物免受生物营养性病原体和坏死性病原体或昆虫的侵害。这种权衡在很大程度上阻止了SA和JA免疫成分用于作物保护的利用，从而引起了对破坏SA-JA拮抗作用的免疫信号成分的关注。局部病原体感染引发全身组织中SA依赖性免疫。这种所谓的系统获得性抗药性（SAR）确保不受SA-JA拮抗作用的持久的广谱抗病性。在这里，我们显示了两个与序列相关的豆蔻精蛋白样蛋白（LLP）通过空间分离的功能促进SAR，而JA通过LLP3促进了局部SAR信号的产生。与LLP1合作，对于系统识别和传播SAR信号非常重要，LLP3可以促进SA依赖的SAR和JA介导的免疫。因此，利用与LLP相关的信号提示可能允许应用植物固有的免疫信号来促进（作物）植物健康。