A lncRNA fine-tunes salicylic acid biosynthesis to balance plant immunity and growth

作者：Ningkun Liu, Yanzhuo Xu, Qi Li, Yuxin Cao, De-Chang Yang, Shasha Liu, Xiaokang Wang, Yingjie Mi, Yang Liu, Chenxi Ding, Yan Liu, Yong Li, Yao‐Wu Yuan, Ge Gao, Jinfeng Chen, Weiqiang Qian, Xiaoming Zhang · 发表于：Cell Host & Microbe · 年份：2022 · DOI：10.1016/j.chom.2022.07.001 · 被引用次数：163 · 研究领域：Plant-Microbe Interactions and Immunity、Plant Molecular Biology Research、Plant Virus Research Studies

Constitutive activation of plant immunity is detrimental to plant growth and development. Here, we uncover the role of a long non-coding RNA (lncRNA) in fine-tuning the balance of plant immunity and growth. We find that a lncRNA termed salicylic acid biogenesis controller 1 (SABC1) suppresses immunity and promotes growth in healthy plants. SABC1 recruits the polycomb repressive complex 2 to its neighboring gene NAC3, which encodes a NAC transcription factor, to decrease NAC3 transcription via H3K27me3. NAC3 activates the transcription of isochorismate synthase 1 (ICS1), a key enzyme catalyzing salicylic acid (SA) biosynthesis. SABC1 thus represses SA production and plant immunity via decreasing NAC3 and ICS1 transcriptions. Upon pathogen infection, SABC1 is downregulated to derepress plant resistance to bacteria and viruses. Together, our findings reveal lncRNA SABC1 as a molecular switch in balancing plant defense and growth by modulating SA biosynthesis.