Resilience of Beneficial Plant-Microbe Interactions in a Changing Global Climate: Emerging Concepts and Future Prospects

Abstract

Climate change is intensifying both abiotic stresses such as drought, salinity, and heat and biotic stresses from pathogens and pests, collectively threatening global food production. These environmental pressures disrupt plant physiology, impair nutrient uptake, and weaken defence systems, while also altering soil microbial communities and their beneficial functions. Plant-associated beneficial microorganisms, including rhizobacteria, endophytes and mycorrhizal fungi, have emerged as key allies in bolstering crop resilience. These microbes enhance plant tolerance through multiple mechanisms: they improve nutrient acquisition, modulate phytohormone signalling, produce stress-alleviating metabolites (including siderophores, osmolytes and antimicrobial compounds), strengthen antioxidant defences and activate systemic resistance pathways such as induced systemic resistance (ISR) and systemic acquired resistance (SAR). Recent advances in microbial consortia and stress-responsive signalling networks highlight the potential of multifunctional microbes to sustain crop productivity under changing climatic conditions. Nevertheless, translating these promising laboratory findings into reliable field applications faces substantial hurdles, including inconsistent performance, limited shelf life and inadequate formulation stability. This review synthesizes current understanding of beneficial plant–microbe interactions under climate-induced stresses, compares the effectiveness of diverse microbial strains and consortia, and identifies critical knowledge gaps. We propose strategic priorities for future research and agricultural implementation, including strain banking, long-term field validation, formulation standardization and integration with precision agriculture. Harnessing beneficial microbes as climate-smart solutions offers an effective pathway towards improving crop productivity, restoring soil health and strengthening global food security in an era of environmental change.