Metabolic trade-offs in sugar beet under drought and beet leaf miner infestation: implications for herbivore success.
Rahman S, Surovy MZ, Vosteen I, Rostás M
Climate Adaptation
The sugar beets and chard in your garden under a dry summer spell may quietly become a better meal for leaf-mining flies, meaning moderate water stress can actually make your plants more vulnerable to insect damage — not less.
Scientists stressed sugar beet plants with different levels of drought and then let a type of fly larva (leaf miners) feed on them. Plants with moderate drought stress turned out to be more nutritious for the larvae, which grew bigger and faster. But when drought was severe, the plants also changed the invisible chemical signals they release into the air, making it harder for the flies to find them in the first place.
Key Findings
Larvae feeding on moderately drought-stressed plants showed the highest growth rates and produced larger pupae and adults compared to well-watered or severely stressed plants.
High drought suppressed and altered the blend of volatile organic compounds (scent chemicals) emitted by plants, leading to fewer eggs laid by female flies on severely stressed plants.
Combined stress of high drought plus leaf mining caused the most pronounced metabolic reprogramming, including elevated amino acids and organic acids, indicating a compounding effect beyond either stress alone.
chevron_right Technical Summary
Sugar beet plants under moderate drought become nutritional hotspots for beet leaf miner larvae, boosting pest growth and damage, while severe drought makes plants harder for pests to find and stunts larval development. The key insight is that drought severity determines whether stress helps or hurts an insect pest's success.
Abstract Preview
Increasing frequency of drought under climate change threatens crop production and intensifies pest pressures, yet the interactive effects of drought and herbivory on plant metabolism and ecologica...
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A sugar beet is a plant whose root contains a high concentration of sucrose and is grown commercially for sugar production. In plant breeding, it is known as the Altissima cultivar group of the common beet. Together with other beet cultivars, such as beetroot and chard, it belongs to the subspeci...