INDUCER OF CBF EXPRESSION 1 promotes cold-enhanced immunity by directly activating salicylic acid signaling

• DOI: 10.1093/plcell/koae096
• Publication Date: 2024-03-27T19:49:26Z
• Authors: Shaoqin Li; Li He; Yongping Yang; Yixin Zhang; Xiao Han; Yanru Hu; Yanjuan Jiang
• Keywords: Inducer; Expression (computer science); Plant Immunity

Abstract Cold stress affects plant immune responses, and this process may involve the salicylic acid (SA) signaling pathway. However, underlying mechanism by which low-temperature signals coordinate with SA to regulate immunity remains unclear. Here, we found that low temperatures enhanced disease resistance of Arabidopsis thaliana against Pseudomonas syringae pv. tomato DC3000. This required INDUCER OF CBF EXPRESSION 1 (ICE1), core transcription factor in cold-signal cascades. ICE1 physically interacted NONEXPRESSER PATHOGENESIS-RELATED GENES (NPR1), master regulator Enrichment on GENE (PR1) promoter its ability transcriptionally activate PR1 were NPR1. Further analyses revealed cold cooperate facilitate pathogen attack an ICE1-dependent manner. treatment promoted interactions NPR1 TGACG-BINDING FACTOR 3 (TGA3) increased ICE1–TGA3 complex PR1. Together, our results characterize a critical role as indispensable regulatory node linking low-temperature-activated SA-regulated immunity. Understanding crucial coordinating multiple associated broadens understanding plant–pathogen interactions.