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Rhizosphere and endophytic microbiomes as biological buffers against microplastic pollution: Mechanisms and remediation strategies

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This review summarizes existing research on tiny plastic particles contaminating farm soils, which can harm plants and reduce crop yields by 25 to 50 percent. It describes how certain soil and plant-associated bacteria and fungi, including Pseudomonas and Bacillus, can break down these plastics and help plants cope with the resulting stress.

Micro- and nanoplastics (MNPs) contamination in agricultural soils has emerged as a critical threat to global food security. These persistent pollutants, originating from mulching films, biosolids, atmospheric deposition, and irrigation water, disrupt soil properties, induce phytotoxicity through oxidative stress and membrane damage, and compromise crop productivity by 25-50%. This review examines the pivotal role of rhizosphere and endophytic microbiomes as biological buffers that mitigate MNPs' impacts on plant-soil systems. We synthesize current knowledge across several domains, including the fate and impacts of MNPs in agriculture, microbial compositional and functional responses to plastic pollution, enzymatic biodegradation mechanisms, and plant stress alleviation strategies. This review introduces new microbial strategies for MNP degradation, combining enzymatic depolymerization, EPS-mediated immobilization, and root exudate-driven co-metabolism to enhance biodegradation efficiency. Additionally, we present a rational design framework for synthetic microbial consortia, focusing on their potential for targeted remediation of microplastics in agricultural systems. Furthermore, we discuss how these strategies can be integrated within circular economy frameworks to foster sustainable agricultural practices. Evidence demonstrates that specialized microbial taxa, including Pseudomonas , Bacillus , Rhodococcus , Streptomyces , and white-rot fungi, employ complementary strategies to degrade MNPs and alleviate plant stress. Future priorities include scaling laboratory findings to field conditions, integrating microbiome management with precision agriculture, and developing climate-resilient consortia. Harnessing rhizosphere and endophytic microbiomes represents a sustainable, nature-based solution for building plastic-resilient agricultural systems.

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