Unveiling Maize's Root Microbiome Assembly Strategy Based on Functional Demands: A Breakthrough by China's Agricultural Science Academy

In a significant advancement, the Plant Nutrition Team at China's Agricultural Science Academy has made remarkable progress in understanding the mechanisms behind the assembly of the root microbiome in maize. Their recent findings, published in the esteemed journal "New Phytologist," shed light on the selection process of rhizobacteria driven by maize's functional requirements, particularly under long-term fertilization practices.

The Importance of Fertilizer Reduction:

Fertilizers play a crucial role in ensuring food security, but excessive use has led to a range of environmental issues. Therefore, reducing fertilizer application while maintaining efficacy has become a pressing concern for achieving high-quality agricultural development. The rhizosphere, the interface for nutrient absorption, offers a promising pathway to improve nutrient utilization efficiency in crops by regulating the structure and function of the root microbiome. However, the assembly strategies of root microbiomes in different soil types and nutrient levels remain unclear, limiting their widespread application in agricultural production.

Insights from Maize's Root Microbiome Assembly:

Through a comprehensive evaluation of soil types, fertilization conditions, and genotypes, the research team uncovered the assembly mechanisms and functional traits of the root microbiome in maize. They found that host selection, soil type, and fertilization practices collectively shape the structure and function of the root microbiome. Under long-term unfertilized conditions, maize recruits a greater abundance of rhizobacteria involved in carbon, nitrogen, phosphorus cycling, and purine metabolism, particularly key nitrogen-fixing microorganisms, to cope with nutrient stress. However, these beneficial functions are executed by different species in different soil types, highlighting maize's root microbiome assembly strategy based on functional demands. This work provides theoretical support for targeted manipulation and efficient utilization of root microbiomes in agricultural systems.

Contributors and Funding:

Dr. Liyu Zhang and Dr. Liang Yuan from China's Agricultural Science Academy's Institute of Agricultural Resources and Regional Planning are the joint first authors of the paper. Dr. Chao Ai and Dr. Huimin Zhang are the corresponding authors, and Academician Wei Zhou provided guidance for the study. The research received funding from the National Key R&D Program (2022YFD1900900), the National Natural Science Foundation of China (32322076 and 32272817), and other projects.

The recent breakthrough by China's Agricultural Science Academy's Plant Nutrition Team in unraveling the assembly strategy of maize's root microbiome based on functional demands brings us closer to addressing the challenges of reducing fertilizer use while enhancing crop productivity. By understanding the intricate interactions between maize and its root microbiome, researchers and agricultural practitioners can devise targeted approaches to manipulate and harness the potential of these microbial communities for sustainable and efficient agricultural practices.