Poplar Trees React to Fungi Before Physical Contact

Scientists discovered that poplar tree roots undergo hidden chemical changes when exposed to volatile compounds released by underground fungi. This reaction occurred even though the roots remained isolated from direct contact. The study ran for six weeks inside a specialized pot system designed to mimic natural conditions.

Researchers chose three distinct fungal partners for comparison. First came Heterobasidion annosum, a harmful pathogen. Second was Postia placenta, a decomposer fungus. Third was Laccaria bicolor, a beneficial ectomycorrhizal symbiont. Each provided different chemical signals to the plant.

The findings reveal fascinating differences. The pathogen triggered strong reductions in leaf chemicals but maintained relatively stable root patterns. The saprotroph introduced unique root-level changes along with certain lipid modifications. The mutualist showed minimal novel chemical alterations. Together, these results prove that poplar trees process fungal volatiles internally, yet the full scope of these responses across various fungal lifestyles remains uncertain.

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