Nanotechnology and Plant-Microbe Interactions: Enhancing Symbiotic Relationships for Crop Resilience

Area of Science:

• Agricultural Science
• Environmental Science
• Microbiology

Background:

• Nanomaterials (NMs) and beneficial microorganisms are increasingly explored independently to enhance crop resilience to abiotic stresses.
• Co-application of NMs and microbes shows synergistic effects, often outperforming individual applications in improving plant growth and stress tolerance.

Purpose of the Study:

• To review the advantages and risks associated with integrating nanomaterials and plant-beneficial microorganisms for sustainable agriculture.
• To highlight the importance of dose, soil characteristics, and microbial strain selection in NM-microbe interactions.
• To assess the current evidence and identify gaps for future research and field application.

Main Methods:

• Literature review of studies on nanomaterial-microbe interactions in agriculture.
• Analysis of effects on plant physiology, nutrient uptake, and stress tolerance under abiotic conditions (drought, salinity).
• Evaluation of impacts on rhizosphere microbial communities and potential ecological risks.

Main Results:

• NM-microbe co-application enhances plant growth, nutrient uptake, biomass, and stress tolerance by improving ionic balance, photosynthesis, and antioxidant activity.
• Specific nanoparticles (ZnO, Fe3O4, SiO2) combined with PGPR or AMF stimulate root development and nutrient acquisition.
• NMs can modulate rhizosphere microbial communities, promoting beneficial taxa and suppressing pathogens, but some NMs exhibit narrow safety margins and can inhibit beneficial microbes.

Conclusions:

• NM-microbe integration offers a promising avenue for sustainable agriculture, improving crop resilience and nutrient use efficiency.
• Potential risks include NM persistence, soil mobility, trophic transfer, and disruption of microbial communities, necessitating careful consideration of dose and environmental factors.
• Current evidence is primarily from short-term studies, requiring long-term ecological monitoring and economic feasibility assessments before widespread field application.