Sesame's wood-building genes ramp up during disease and salt stress
Crop Improvement
Sesame is a staple oilseed for millions of small farmers, and knowing which genes help it fight off soil fungus and salty ground could mean sturdier harvests as farmland gets saltier worldwide.
Plants make a tough material called lignin to build strong cell walls and fight off invaders, and a family of genes called CAD genes does much of that work. Researchers looked at all the CAD genes in sesame and tracked which ones got busier when the plant was attacked by a root-rotting fungus or grown in salty soil. Some gene copies clearly stepped up under stress, giving breeders a shortlist of genes to target for hardier sesame varieties.
Key Findings
Researchers cataloged the full CAD gene family in sesame and traced its evolutionary history, including gene duplication events.
Certain CAD gene copies showed distinct expression changes when sesame was infected with the charcoal rot fungus Macrophomina phaseolina.
A subset of CAD genes also responded to salt stress, suggesting shared or overlapping pathways for disease resistance and salt tolerance.
chevron_right Technical Summary
Scientists mapped a family of genes in sesame that help build the plant's woody defenses, finding that specific copies switch on when the crop faces a fungal root disease or salty soil. This points to breeding targets for tougher, more resilient sesame plants.
Species Mentioned
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Sesame is a plant in the genus Sesamum, also called benne. Numerous wild relatives occur in Africa and a smaller number in India. It is widely naturalized in tropical regions around the world and is cultivated for its edible seeds, which grow in pods. World production in 2024 was 6.7 million tonn...