A plant compound traps and weakens a major rice disease fungus
Yan J, Zhu X, Li L, Shen ZF, Bao JD
Crop Improvement
Rice blast fungus destroys enough rice worldwide each year to feed tens of millions of people, so a natural compound that cripples its ability to infect could mean fewer crop losses and less reliance on synthetic fungicides.
Rice blast is one of the most destructive diseases affecting rice crops around the world, caused by a fungus that infects plants through specialized infection structures. Researchers discovered that a natural compound found in certain desert shrubs, called NDGA, binds to a key protein the fungus uses for its internal recycling system and throws that system into disarray, weakening the fungus's ability to germinate, form infection structures, and cause disease. Interestingly, the fungus tries to protect itself by shuttling the compound into its own waste disposal system, but when scientists blocked that defense, the fungus became even more sensitive to the treatment, pointing to a promising new angle for designing antifungal treatments.
Key Findings
NDGA (nordihydroguaiaretic acid), a naturally occurring plant lignan, was identified as a MoAtg8-binding compound through structure-guided virtual screening of a natural product library
NDGA suppressed conidial germination and appressorium formation and reduced pathogenicity in Magnaporthe oryzae (rice blast fungus), with no detectable phytotoxicity to rice
MoAtg8 binds NDGA through a specific amino acid (Gln81) and routes it to vacuoles for detoxification; disrupting autophagy or mutating Gln81 significantly increased fungal sensitivity to NDGA
chevron_right Technical Summary
Scientists found that a natural plant compound called NDGA can disable the rice blast fungus, a devastating crop pathogen, by jamming its cellular recycling system. The fungus's own 'garbage disposal' process, called autophagy, backfires by hauling the toxic compound away before it can do damage, but blocking that process makes the fungus far more vulnerable to the treatment.
Abstract Preview
Original paper
Structure-based targeting of Atg8 uncovers its essential role in autophagy-mediated detoxification.
Autophagy degrades and recycles intracellular material, allowing cells to maintain homeostasis and adapt to environmental stress. In the rice blast fungus Magnaporthe oryzae, the core autophagy pro...
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