The preceding root system drives the composition and function of the rhizosphere microbiome

Area of Science:

• Soil Science
• Microbiology
• Agricultural Science

Background:

• Soil microbial communities are crucial for terrestrial plant life, but their functions remain understudied.
• The detritusphere, comprising decaying root channels, is vital for plant growth and health.
• Understanding the detritusphere microbiome's response to agricultural management is key for food production.

Purpose of the Study:

• To establish a comprehensive soil microbial gene catalog.
• To investigate the detritusphere microbiome's role in shaping the rhizosphere microbiome.
• To assess the impact of agricultural practices on soil microbial communities.

Main Methods:

• Metagenomic analysis of soil microbial communities.
• Comparison of rhizosphere and detritusphere microbiomes under different soil management conditions (tillage vs. no-tillage).
• Analysis of microbial gene content and functional capacity.

Main Results:

• The detritusphere microbiome significantly regulates rhizosphere microbiome composition and function, more so than plant type.
• Rhizosphere microbiomes were similar in the presence of intact decaying roots but diverged when roots were disrupted by tillage.
• Interactions between rhizosphere and detritusphere microbiomes in the presence of decaying roots led to enrichment of genes for nutrient metabolism.

Conclusions:

• The study provides a high-quality soil microbial metagenome catalog.
• The detritusphere microbiome is a major determinant of the metagenome in developing root systems.
• Modifying soil microbial functions through management practices can enhance plant health and food security.