Functional Microbial Features Driving Community Assembly During Seed Germination and Emergence.

Area of Science:

• Microbiology
• Plant Science
• Ecology

Background:

• Seed-borne microorganisms are the primary source of the plant microbiota.
• Understanding early plant-microbe interactions is vital for plant fitness.

Purpose of the Study:

• To analyze structural and functional shifts in the plant microbiota during germination and emergence.
• To investigate the role of nutrient availability in shaping early plant-associated microbial communities.

Main Methods:

• Shotgun DNA sequencing of microbial communities associated with seeds, germinating seeds, and seedlings of bean and radish.
• Bacterial isolate characterization for growth rate analysis.
• Metagenomic data binning for microbial genome reconstruction.

Main Results:

• Observed enrichment of Enterobacteriales and Pseudomonadales during seedling emergence.
• Identified copiotrophic functional traits correlating with increased nutrient availability post-germination.
• Demonstrated faster growth rates in selected seedling-associated bacterial isolates compared to seed-associated ones.
• Reconstructed population genomes of major bacterial taxa.

Conclusions:

• Nutrient availability during germination drives significant changes in plant microbial community composition.
• Copiotrophic bacteria are selected during early plant development, influencing the plant microbiome.
• This study provides novel insights into the dynamic plant microbiome during germination and emergence.