Soil bacteria broadcast growth-boosting chemical signals through the air around plants
Yang Y, Jin J, Liu R, Wang X, Ma B
Soil Health
Bacteria already living around your garden's roots signal your plants through the air to ramp up photosynthesis, which means selecting and adding the right microbial strains to soil could reduce how much synthetic nitrogen fertilizer your plants actually need.
A soil bacterium called PAR690, found in dirt around plant roots, releases airborne chemicals that drift toward nearby plants and trigger a cascade of changes inside them. When plants detect these signals, they ramp up photosynthesis, pull in more nitrogen from the soil, and produce more of the green pigment that drives growth. Scientists identified exactly which genes these signals switch on and off, giving us a detailed map of how living soil microbes can make plants healthier without any chemical inputs.
Key Findings
Bacillus sp. PAR690 produces three specific airborne growth-promoting compounds: acetoin, 2,3-butanediol, and indole, confirmed by GC/MS chemical analysis
VOC exposure significantly increased chlorophyll a/b, carotenoids, and total chlorophyll in test plants, alongside higher accumulation of reducing sugars, soluble sugars, and starch
Gene expression analysis revealed upregulation of photosynthesis antenna protein genes and nitrate transporter genes (NRT2.1 and NRT2.5), directly explaining observed gains in nitrogen uptake
chevron_right Technical Summary
A soil bacterium found near plant roots releases airborne chemical compounds that boost photosynthesis, increase chlorophyll, and improve nitrogen uptake in plants. Researchers mapped the specific genes these airborne signals activate, revealing how some bacteria help plants grow without direct contact.
Abstract Preview
Original paper
Volatile organic compounds from Bacillus sp. PAR690 Promote plant growth by regulating photosynthesis and nitrogen metabolism.
Plant growth-promoting bacteria (PGPB) enhance plant growth through multiple mechanisms; however, the underlying plant molecular response pathways remain insufficiently understood, particularly tho...
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