Corn disease bacteria show surprising regional diversity across North America
Flores-Lopez LF, Callejas DM, Vidaver AK, Khokhani D, Morales-Galvan O
Crop Improvement
If you grow sweet corn in your backyard or watch it in nearby fields, this disease-causing bacterium has been quietly diversifying for decades, and knowing which strains cause the worst damage helps breeders build better resistant varieties.
Goss's wilt is a bacterial disease that can devastate corn plants, causing leaf blight and wilting. Researchers decoded the full genomes of 24 bacterial strains, some collected as far back as 1969, and discovered that strains from different regions and time periods have evolved distinct traits like toxin production, slime coatings, and pigment. One trait, the ability to break down plant cell walls, was directly linked to how severe the disease gets, giving scientists a new target for fighting the infection.
Key Findings
24 long-read bacterial genomes were sequenced, including 20 contemporary Mexican isolates and 4 US strains from 1969-1996
The species has a closed pangenome, with accessory gene variation tied to geographic origin and collection era
Cellulolytic (cell-wall-degrading) enzyme activity correlated with disease severity, while pigment production linked to thiamine metabolism
chevron_right Technical Summary
Scientists sequenced the genomes of the bacterium behind Goss's wilt, a major corn disease, and found that strains from Mexico and the US vary widely in how they cause disease and compete for resources, offering clues for better disease management.
Abstract Preview
Original paper
Ecogenomic Diversity of Clavibacter nebraskensis in North America.
Goss's wilt and leaf blight of maize is caused by Clavibacter nebraskensis and has reemerged as an important disease in North America. Despite its epidemiological relevance, this species remains po...
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