A bacteria-infecting virus calms plant disease without killing the germ
Erdrich SH, Keilhammer MT, Sharma S, Župunski M, Schurr U
Plant Signaling
If you've ever watched cabbage, broccoli, or kale in your garden wilt from black rot, this points to a future spray that protects the crop by disarming the pathogen instead of dousing your soil with chemicals.
Scientists tested a virus called a phage that specifically attacks a bacterium responsible for black rot disease in cabbage-family plants. Even though the phage didn't kill off all the bacteria, treated plants grew normally again within two weeks because the bacteria turned down their attack genes and the plant's own stress alarms quieted down too. The bacteria also didn't develop resistance to the phage while living inside the plant, which is a big deal for keeping this kind of treatment useful over time.
Key Findings
Phage treatment restored normal plant growth within 14 days post-inoculation despite not eliminating the Xanthomonas campestris bacteria
Treated plants showed reduced jasmonate immune signaling and lower reactive oxygen species levels
Bacteria in phage-treated plants had reduced expression of virulence genes including type III secretion system, effectors, and flagella biosynthesis genes, and did not develop resistance in planta
chevron_right Technical Summary
A virus that infects a crop-killing bacterium can protect cabbage-family plants from disease without wiping out the bacteria entirely, by making the bacteria less aggressive and calming the plant's own stress response.
Abstract Preview
Original paper
Phage biocontrol reduces the disease burden and modulates plant immunity through suppression of bacterial virulence.
Bacteriophages are emerging as modulators of plant-microbe interactions and promising biocontrol agents against bacterial plant pathogens. In this study, we investigate the tripartite interaction b...
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