Core Microbial Taxa Strengthen Root Microbial Network Stability Under Drought Stress

Area of Science:

• Agricultural Science
• Microbiology
• Plant Science

Background:

• Global drought intensification poses risks to crop yields.
• The impact of drought on plant-associated microbial communities is not fully understood.
• Understanding these microbial shifts is crucial for agricultural sustainability.

Purpose of the Study:

• To investigate how drought stress affects the diversity and stability of wheat-associated microbiomes.
• To identify key microbial taxa contributing to microbiome stability under drought.
• To explore the potential for microbiome manipulation to enhance crop stress tolerance.

Main Methods:

• Wheat was cultivated under drought stress conditions.
• Microbial communities were sampled from bulk soil, rhizosphere, and roots across three growth stages.
• Microbial diversity, network stability, and core taxa contributions were analyzed using multiple statistical approaches.

Main Results:

• Drought stress altered microbial diversity based on microbial kingdom, plant niche, and growth stage.
• Rhizosphere microbial networks decreased in complexity and stability, while root networks showed enhanced stability.
• Specific core taxa, including Glycomyces and Thermoactinomycetaceae, were enriched in roots, contributing to network stability.

Conclusions:

• Drought stress can disrupt soil microbial communities but enhance the stability of root-associated microbiomes.
• Enrichment of drought-tolerant core taxa in roots is a key mechanism for maintaining microbiome stability.
• Harnessing these drought-tolerant microbes offers a strategy for improving crop resilience to environmental stress.