Core Viewpoint - The article discusses the discovery of a novel global immune system in plants called systemic stomatal immunity (SSIM), which allows plants to rapidly respond to pathogen threats by transmitting immune signals from infected to uninfected leaves [3][8]. Group 1: Research Findings - The research identifies a mobile peptide encoded by upstream open reading frames (uORF) that mediates systemic stomatal immunity, termed USIC [5][6]. - Infected local leaves transmit danger signals to distal uninfected leaves, triggering stomatal closure and initiating the SSIM defense mechanism [5][6]. - The peptide USIC is recognized by the SIRK1-KIN7 receptor complex in systemic leaves, leading to a cascade of molecular interactions that regulate stomatal immunity [5][6]. Group 2: Implications - This discovery of SSIM represents a significant advancement in plant immunology, distinguishing it from the slower systemic acquired resistance (SAR) that relies on salicylic acid pathways [8]. - The findings provide a theoretical foundation for developing crops with broad-spectrum and rapid disease resistance traits, potentially enhancing agricultural resilience [8].