Multi-omics and in silico assessment of ecological risks posed by agrochemical coatings: Disruption of rhizosphere stress signaling and induction of bulb rot in Fritillaria cirrhosa.
Lu Y, Wu Y, Zhang H, Gao D, Xie H
Soil Health
Fungicide treatments sold to protect fritillary bulbs from rot can make rot three times worse by dismantling the very soil community those bulbs depend on — a warning for anyone growing ornamental or medicinal bulbs who reaches for a coating product.
Scientists discovered that coating fritillary bulbs with antifungal chemicals — normally done to keep harmful fungi away — accidentally killed off many of the helpful soil bacteria the plant relies on to stay healthy. Without those bacterial allies, disease-causing fungi moved in and caused far more rot than in untreated bulbs. The coatings also jammed the plant's own chemical alarm system, leaving it less able to signal for help or mount its own immune response.
Key Findings
Fungicide seed coatings increased bulb rot incidence 2.8-fold compared to untreated controls (P < 0.001).
Coating treatment caused a 25.1% decline in rhizosphere bacterial diversity and led to enrichment of pathogenic Fusarium species in the soil community.
Adenosine — a key plant defense signaling molecule — dropped to just 0.03-fold of normal levels, while jasmonic acid (the plant's anti-fungal immune hormone) also declined, indicating broad disruption of the plant's chemical communication with soil microbes.
chevron_right Technical Summary
Fungicide seed coatings applied to Fritillaria cirrhosa bulbs — intended to prevent disease — actually increased bulb rot nearly threefold by collapsing beneficial soil bacteria, silencing the plant's chemical defense signals, and creating conditions that favor pathogenic Fusarium fungi.
Abstract Preview
Agrochemical seed coatings are widely used to control soil-borne pathogens. However, their unintended ecological effects on rhizosphere interactions and plant health remain unclear. Here, we combin...
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Fritillaria (fritillaries) is a genus of spring flowering herbaceous bulbous perennial plants in the lily family (Liliaceae). The type species, Fritillaria meleagris, was first described in Europe in 1571, while other species from the Middle East and Asia were also introduced to Europe at that ti...