Foliar pathogens and drought drive plant-soil feedback between two co-occurring herbaceous plant species.
Tanford P, Vargas RC, Bugay MJ, Dantas G, Stein C
Soil Health
The powdery mildew you spot on your garden plants isn't just a leaf problem — it's quietly reshaping the soil microbes beneath them in ways that can weaken neighboring plants for seasons to come.
When two plants grow near each other, they each leave a unique fingerprint of microbes in the soil. This study found that those soil microbes can actually hurt the other plant — but only when a common mold disease is also attacking the leaves. Dry conditions made things even worse, suggesting that disease and drought team up to intensify underground competition between plants.
Key Findings
Negative plant-soil feedback between bee balm (Monarda fistulosa) and narrowleaf plantain (Plantago lanceolata) only emerged when both live soil microbes and powdery mildew infection were present simultaneously.
The strongest competitive feedback occurred under the combination of foliar powdery mildew infection and drought stress, indicating these stressors act synergistically.
High-throughput sequencing confirmed that both fungal and bacterial soil communities were shaped by which plant species had previously grown there, demonstrating species-specific soil legacy effects.
chevron_right Technical Summary
A study found that two common wildflowers actively harm each other's growth through soil microbes — but only when a fungal leaf disease is also present. Drought made this underground rivalry even worse, revealing that what happens above ground (like disease) shapes underground soil communities in ways that ripple through plant communities.
Abstract Preview
Plants alter soil biotic and abiotic properties with consequences for plant community dynamics at local and global scales, but how plant-soil interactions are affected by other environmental and bi...
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Monarda is a genus of flowering plants in the mint family, Lamiaceae. The genus is endemic to North America. Common names include bergamot, bee balm, horsemint, and oswego tea, the first being inspired by the fragrance of the leaves, which is reminiscent of bergamot orange. The genus was named fo...