The stage-specific regulation and role of root-knot nematode SWEET genes.
Maxwell MWH, Rohilla B, Chippendale J, Bell CA
Crop Improvement
Root-knot nematodes quietly devastate vegetable gardens and farm crops worldwide — understanding exactly how they feed on roots could lead to new targeted treatments that protect tomatoes, carrots, and other crops without broad pesticide use.
Root-knot nematodes are tiny worms that burrow into plant roots and drain the sugars plants make through photosynthesis. Researchers discovered that these worms have a family of sugar-transporter genes that switch on at different points in the worm's life — some help young worms break into roots, while others help older worms gorge on plant sugars once they're inside. They also traced a chain of molecular 'switches' that controls when these transporters turn on, giving scientists a precise target for disrupting the parasite's feeding without harming the plant.
Key Findings
Two SWEET genes (Mi-SWEET2 and Mi-SWEET4) drive root invasion in juvenile nematodes — knocking them down reduced invasion success.
Three other SWEET genes (Mi-SWEET3, 5, and 7) are required for post-invasion growth and nutrient uptake; silencing them stunted nematode development inside the root.
A regulatory chain was identified: the microRNA let-7 controls the transcription factor HBL1, which in turn controls Mi-SWEET3 expression, revealing a three-layer molecular switch governing parasite feeding.
chevron_right Technical Summary
Scientists have identified specific sugar-transport genes in root-knot nematodes that the parasites use at different life stages to invade plant roots and steal nutrients, opening new avenues for targeted crop protection.
Abstract Preview
The root-knot nematode Meloidogyne incognita is a globally significant plant parasite that causes substantial crop losses. While pre-parasitic juveniles rely on innate energy reserves, later life s...
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