Perennial sorghum fends off aphids with rapid chemical defense
Kaler E, Pingault L, Nabukalu P, Murrell E, Cox S
Crop Improvement
If you grow sorghum or grasses in your garden or admire the wild Johnsongrass relatives along roadsides, this research points to a future where crops fight pests on their own, cutting the need for sprays.
Researchers studied a perennial type of sorghum, a relative of the common grain crop, to see how it defends itself against a tiny insect called the sugarcane aphid that can devastate fields. They found that resistant plants quickly ramp up production of defensive chemicals, strengthen their cell walls, and activate specific genetic switches within hours of being attacked, while susceptible plants don't respond nearly as fast. This gives plant breeders a clear set of genetic targets to build sturdier, pest-resistant sorghum varieties that could need fewer chemical pesticides.
Key Findings
Identified 10,620 differentially expressed genes across early (6 and 24 hours) and late (7 days) time points after aphid infestation
Resistant perennial sorghum lines showed significantly higher expression of genes for reactive oxygen species, death acids, callose synthesis, and defense hormones compared to susceptible and control plants
Transcription factors bHLH, NAC, and MYB were uniquely upregulated in the aphid-resistant genotype, marking them as candidate regulators for breeding programs
chevron_right Technical Summary
Scientists found that a perennial version of sorghum can fight off a major crop pest, the sugarcane aphid, by rapidly switching on a suite of internal defenses, from toxic chemicals to reinforced cell walls, offering breeders a genetic roadmap for tougher, longer-lasting sorghum varieties.
Abstract Preview
Original paper
Transcriptomic insights into perennial sorghum resistance to sugarcane aphids.
Perennial crops, compared to annual cereals, offer multiple advantages that enhance crop resilience and promote sustainable agricultural practices such as low economic input, better soil health, in...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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