Sorghum's weed defense hormone quietly weakens its fungal allies
McLaughlin CM, Takou M, Masanga J, Lawrence-Paul EH, Abraham EJ
Crispr
If you've ever top-dressed a garden bed with mycorrhizal inoculant, this shows how a single hormone tweak in a plant's roots can make it less welcoming to the very fungi that help it drink water and find nutrients.
Sorghum plants release chemical signals from their roots called strigolactones, which normally help them team up with helpful soil fungi but also accidentally invite a parasitic weed called Striga to attack. Researchers used gene editing to shut off two of the genes that make these signals, and while the edited plants successfully fooled the parasite, they also grew less efficiently, changed their root shapes, and struggled to form their usual fungal partnerships. The findings show that breeding crops to resist one threat can quietly cost them something else they need underground.
Key Findings
CRISPR deletion of SbCCD8b reduced net carbon assimilation rate, altered root architecture and anatomy, and diminished both establishment and benefit of mycorrhizal fungal symbionts
LGS1 deletion mutants showed delayed mycorrhizal colonization, reduced carbon assimilation, and differentially expressed genes enriched for stress-response and growth-related promoter motifs
Restoring functional LGS1 into a naturally deficient sorghum line rescued resistance to the parasite Striga via root exudates but did not consistently restore other altered traits, suggesting a nearby gene may be involved
chevron_right Technical Summary
Scientists edited sorghum genes that control strigolactone hormones, the same chemical signals that lure a devastating parasitic weed called Striga to attack roots. Removing these genes made plants resistant to the parasite, but came with hidden costs: lower photosynthesis, altered root structure, and weaker partnerships with beneficial fungi.
Abstract Preview
Original paper
Strigolactone effects on Sorghum bicolor ecophysiology and symbioses.
Strigolactones are ecologically, developmentally, and physiologically important hormones, but much remains unknown about their evolution and role in non-model species. Sorghum is a globally importa...
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