Potato hormone and gene clues could stop scab disease
Crop Improvement
The potatoes in your garden bed or on your dinner plate are under constant threat from a soil pest with no chemical cure, and this research maps out the plant's own defense genes that breeders could use to grow tougher varieties.
Powdery scab is a soil-borne disease that damages potatoes and also spreads a virus that rots the inside of tubers, and right now there's no spray that stops it. Researchers dug into the potato's internal chemistry and found that a hormone called salicylic acid, the same one plants use to fight off many infections, plays a central role in resisting this disease. They also found specific genes, active in root tissue during the earliest stages of infection, that seem to help potatoes either fend off or fall victim to the pathogen, giving breeders a genetic roadmap for building tougher potato varieties.
Key Findings
Salicylic acid signaling was identified as a central mechanism in potato defense against Spongospora subterranea (Sss), the cause of powdery scab
Transcriptomic analysis of hairy root cultures identified multiple disease resistance (R) genes active within the first 72 hours of infection
Spatial transcriptomics of infected root galls revealed additional resistance genes and defense-related enzymes, including lipoxygenases, glutathione-S-transferases, and starch synthesis enzymes
chevron_right Technical Summary
Scientists have pinpointed how potatoes defend themselves against powdery scab, a disease-causing microbe that also spreads a virus that rots tubers. The findings point to specific plant hormones and genes that could be bred into future potato varieties for stronger, more reliable resistance.
Abstract Preview
Original paper
MOLECULAR MECHANISMS OF HOST DEFENSE TO POTATO POWDERY SCAB DISEASE
Powdery scab is a significant disease in potato, caused by the obligate biotrophic pathogen Spongospora subterranea f. sp. subterranea (Sss). This pathogen not only causes substantial yield and qua...
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The potato is a starchy tuberous vegetable native to the Americas that is consumed as a staple food in many parts of the world. Potatoes are underground stem tubers of the plant Solanum tuberosum, a perennial in the nightshade family Solanaceae.