Tobacco plants use their genes to recruit disease-fighting soil bacteria
Su H, Liu H, Tao J, Qu Z, Wang Q
Soil Health
If you've ever lost a tomato or pepper to wilt disease, this research shows why some plant varieties shrug off root pathogens: their genetics actively shape a protective community of microbes living right at the root tips.
Researchers looked at 50 varieties of tobacco plants and found that each plant's genetic makeup influences which bacteria and fungi set up shop around its roots. Some of those genes are linked to the plant making specific chemicals, like terpenoids, that seem to invite in helpful bacteria. One of those bacteria turned out to be a natural enemy of a nasty fungal pathogen, and when applied to plants in greenhouse tests, it cut down on disease.
Key Findings
Across 50 tobacco cultivars, host genotype significantly shaped the diversity and composition of root-associated microbial communities, especially in the rhizosphere
Mediation analysis showed host genetic variation influences Pseudomonadaceae abundance partly through secondary metabolites, particularly terpenoids
The bacterial isolate Pseudomonas aeruginosa FZ1 suppressed Fusarium oxysporum growth, boosted host defenses, and reduced disease severity in greenhouse trials
chevron_right Technical Summary
Scientists found that a tobacco plant's own genes help determine which soil microbes live around its roots, and that some of those microbes, including a bacterium called Pseudomonas aeruginosa FZ1, can fight off a destructive fungal disease. This points toward breeding crops that recruit their own protective microbes instead of relying solely on chemical fungicides.
Abstract Preview
Original paper
Host genetic variation is associated with root-associated microbiome assembly and resistance to Fusarium oxysporum in tobacco.
Plant-microbe interactions are essential for plant health, yet the genetic basis of host control over root-associated microbiome assembly in Nicotiana tabacum remains unclear. We integrated whole-g...
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Tobacco is the common name of several plants in the genus Nicotiana of the family Solanaceae, and the general term for any product prepared from the cured leaves of these plants. Seventy-nine species of tobacco are known, but the chief commercial crop is N. tabacum. The more potent variant N. rus...