The role of phages in plant-associated microbial communities.
Smith RE, Holtappels D
Soil Health
The invisible ecosystem in your garden soil is partly governed by viruses — and learning how those viruses keep beneficial bacteria in balance could soon let growers build custom microbial blends that replace pesticides and fertilizers.
Plants are surrounded by trillions of bacteria that act like a support crew — helping roots drink up nutrients, fending off diseases, and cushioning the plant against heat or drought. But living alongside those bacteria are even tinier viruses called phages that hunt and kill specific bacteria, keeping the whole community from being taken over by any single type. This review pulls together recent research showing that phages aren't just destroyers — they're ecosystem referees that keep the bacterial team diverse and functioning, which ultimately helps plants thrive.
Key Findings
Bacteriophages shape plant-associated microbiomes through multiple mechanisms including transduction, lysogenic conversion, and evolutionary pressure on bacterial hosts.
Kill-the-Winner dynamics — where phages preferentially attack whichever bacterial species becomes dominant — help maintain microbial diversity across entire communities, not just individual interactions.
Maintaining microbial diversity via phage activity appears to support plant growth, suggesting phages are functionally important to plant health outcomes, not merely passive bystanders.
chevron_right Technical Summary
Bacteriophages (viruses that infect bacteria) play a surprisingly powerful role in shaping the microbial communities living around plant roots and leaves — communities that help plants absorb nutrients, survive drought, and fight disease. Understanding how phages regulate these microbial networks could lead to better ways to protect crops and gardens without chemicals.
Abstract Preview
Microbial communities deliver essential functions in ecosystems. In plant environments, the plant microbiome facilitates nutrient uptake, supports plants during abiotic stress, and counteracts dise...
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