Symbiotic interactions of plant microbiota in alleviating stress: a review

Plants continuously encounter a wide range of biotic and abiotic stresses that adversely affect their growth, development, and productivity. Because they are sessile, plants cannot escape these unfavorable conditions and therefore rely on a diverse array of morpho-physiological, biochemical, and molecular adaptations to survive. Among these adaptive strategies, symbiotic associations with beneficial microorganisms have emerged as a crucial mechanism for enhancing stress tolerance. These plant-microbe interactions are mediated by intricate chemical signaling networks that regulate nutrient exchange, defense responses, and stress adaptation. Despite their immense potential for sustainable agriculture, the large-scale application of beneficial microbes remains limited owing to poor microbial establishment under field conditions and an incomplete understanding of the complex mechanisms governing plant-microbe mutualism. Deciphering these interactions is particularly challenging because they are highly dynamic and involve continuous communication between plants and diverse microbial communities. Recent advances in omics technologies, synthetic biology, and nanotechnology provide unprecedented opportunities to unravel these complex relationships at the molecular and systems levels. This review summarizes plant adaptive strategies under biotic and abiotic stresses, examines the role of microbial symbiosis in stress alleviation, and highlights emerging approaches, including multi-omics integration, synthetic microbial consortia, engineered quorum-sensing circuits, holobiont-level analyses, and nanoparticle-mediated modulation of the rhizosphere microbiome, for understanding and engineering beneficial plant-microbe interactions. Collectively, these advances offer new insights into symbiotic crosstalk and provide a foundation for developing resilient and sustainable agricultural systems.