The plant trans-Golgi network component ECHIDNA regulates defense, cell death, and endoplasmic reticulum stress

• DOI: 10.1093/plphys/kiac400
• Publication Date: 2022-08-26T14:00:06Z
• Authors: Lijiang Liu; Li Qin; Luqman Bin Safdar; Chuanji Zhao; Xiaohui Cheng; Meili Xie; Yi Zhang; Feng Gao; Zetao Bai; Junyan Huang; Rishikesh P Bhalerao; Shengyi Liu; Yangdou Wei
• Keywords: Callose; Plant Immunity

Abstract The trans-Golgi network (TGN) acts as a central platform for sorting and secreting various cargoes to the cell surface, thus being essential full execution of plant immunity. However, fine-tuned regulation TGN components in defense stress response has been not fully elucidated. Our study revealed that despite largely compromising penetration resistance, loss-of-function mutation component protein ECHIDNA (ECH) induced enhanced postinvasion resistance powdery mildew Arabidopsis thaliana. Genetic transcriptome analyses hormone profiling demonstrated ECH loss resulted salicylic acid (SA) hyperaccumulation via ISOCHORISMATE SYNTHASE 1 biosynthesis pathway, thereby constitutively activating SA-dependent innate immunity was responsible resistance. Furthermore, ech mutant displayed accelerated SA-independent spontaneous death constitutive POWDERY MILDEW RESISTANCE 4-mediated callose depositions. In addition, led chronically prolonged endoplasmic reticulum mutant. These results provide insights into understanding role responses.