PuSH - Publication Server of Helmholtz Zentrum München: Mycorrhiza-Tree-Herbivore Interactions: Alterations in poplar metabolome and volatilome.

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Sivaprakasam Padmanaban, P.B. ; Rosenkranz, M. ; Zhu, P. ; Kaling, M. ; Schmidt, A.* ; Schmitt-Kopplin, P. ; Polle, A.* ; Schnitzler, J.-P.

Mycorrhiza-Tree-Herbivore Interactions: Alterations in poplar metabolome and volatilome.

Metabolites 12:93 (2022)

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Plants are continuously interacting with other organisms to optimize their performance in a changing environment. Mycorrhization is known to affect the plant growth and nutrient status, but it also can lead to adjusted plant defense and alter interactions with other trophic levels. Here, we studied the effect of Laccaria bicolor-mycorrhization on the poplar (Populus x canescens) metabolome and volatilome on trees with and without a poplar leaf beetle (Chrysomela populi) infestation. We analyzed the leaf and root metabolomes employing liquid chromatography–mass spectrometry, and the leaf volatilome employing headspace sorptive extraction combined with gas-chromatography– mass spectrometry. Mycorrhization caused distinct metabolic adjustments in roots, young/infested leaves and old/not directly infested leaves. Mycorrhization adjusted the lipid composition, the abundance of peptides and, especially upon herbivory, the level of various phenolic compounds. The greatest change in leaf volatile organic compound (VOC) emissions occurred four to eight days following the beetle infestation. Together, these results prove that mycorrhization affects the whole plant metabolome and may influence poplar aboveground interactions. The herbivores and the mycorrhizal fungi interact with each other indirectly through a common host plant, a result that emphasizes the importance of community approach in chemical ecology.

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