Bacteria and fungi warn plants of danger using invisible gases
Khan RS, Iqbal A, Gul N, Imtiaz N, Islam ZU
Plant Signaling
The soil microbes around your tomatoes or houseplant roots are constantly texting chemical warnings that switch on the plant's own immune system, which means healthier soil could mean fewer pesticides in your garden.
Bacteria and fungi living in soil and on leaves give off scent-like chemical compounds, and some of these compounds act like an early warning system for plants. When a plant detects certain microbial smells, it ramps up its internal defenses against pests and diseases before an attack even happens. Scientists are now studying how to harness these natural signals to help crops protect themselves with less need for chemical treatments.
Key Findings
Key mVOCs like 2,3-butanediol, acetoin, dimethyl disulfide, and geosmin activate plant defense hormone pathways including jasmonic acid, salicylic acid, and ethylene
These compounds work two ways: directly killing or suppressing pathogens and indirectly triggering the plant's own immune gene expression
mVOCs also reshape root chemical exudates, which in turn shifts the composition of microbial communities living in the soil around roots
chevron_right Technical Summary
Soil and leaf microbes release invisible gases that trigger plants' immune defenses before pests or disease even arrive, priming plants to fight off threats faster and more effectively.
Abstract Preview
Original paper
Microbial volatile organic compounds in plant defense: mechanisms, signaling networks, and agricultural applications.
Microbial volatile organic compounds (mVOCs) are low-molecular-weight metabolites released by bacteria and fungi in the rhizosphere and phyllosphere. mVOCs have emerged as important mediators of pl...
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Soil health is the capacity of soil to function as a living ecosystem, supporting complex interactions between microorganisms, soil fauna, and plant communities. For plant science, soil health is critical because these biological and chemical soil properties directly control nutrient availability,
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