Maize Field Study Reveals Covaried Microbiota and Metabolic Changes in Roots over Plant Growth

Area of Science:

• Microbial Ecology
• Plant-Microbe Interactions
• Agricultural Science

Background:

• Plant roots host diverse microbial communities (root microbiota) crucial for plant growth.
• The interplay between soil management, root microbiota composition, and plant performance is not well understood.
• Understanding these dynamics is key to optimizing agricultural practices and plant health.

Purpose of the Study:

• To characterize maize root-associated bacterial, fungal, and oomycetal communities.
• To investigate how soil management and plant growth stages influence these microbial communities.
• To identify stable and dynamic microbial taxa and their relationship with root metabolites.

Main Methods:

• Analysis of root-associated microbial communities (bacteria, fungi, oomycetes) in maize.
• Study conducted across vegetative and reproductive growth stages in field experiments.
• Comparison of microbial communities under contrasting soil management and phosphate conditions, including a phosphate transporter mutant.

Main Results:

• Maize root microbiota composition is significantly influenced by soil management and host growth stage.
• Identified stable microbial taxa persisting throughout the maize life cycle and dynamic taxa responding to root metabolites.
• Observed a host-specific 'footprint' on soil biota, with bacterial communities converging across soil, rhizosphere, and root environments during reproductive growth.

Conclusions:

• The maize root microbiota exhibits complex spatiotemporal dynamics, with distinct stable and dynamic microbial assemblages.
• Bacterial communities show greater responsiveness to root metabolic changes compared to fungal communities.
• Findings highlight the significant impact of soil management and host physiology on shaping the root microbiome.