5'UTR Dynamics: Modulating Model Plant Defense Mechanisms against Fungal Threats.

Fungal pathogens threaten global crop production, causing significant yield losses and food security concerns. Understanding plant defense mechanisms against these pathogens is essential for effective disease management. The 5'-untranslated region (5'UTR) has emerged as a key regulator of immune response genes in model plants such as Arabidopsis thaliana and Nicotiana tabacum during fungal infection. The 5'UTR, traditionally linked to mRNA translation, plays a crucial role in post-transcriptional regulation of immune responses. Fungal pathogens utilize strategies like appressoria and haustoria for host penetration, prompting immune signaling via pattern recognition receptors (PRRs), which activate PAMP-triggered immunity (PTI) and effector-triggered immunity (ETI). Recent studies show that 5'UTRs influence immune gene expression by modulating translation initiation and mRNA stability during infection. The regulatory elements are upstream open reading frames (uORFs) and RNA-binding proteins. Understanding these dynamics of novel strategies can allow the fine-tuning of immune responses, offering potential targets to improve crop disease resistance.