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Common mycelial network modulates neighbour-primed plant defences against foliar pathogens by co-opting distinct inter-plant metabolic and biotic stress responses

ABSTRACT: This study contains raw and processed mass spectrometry-based metabolomics data from Medicago truncatula plants used to investigate inter-plant signalling through arbuscular mycorrhizal fungal common mycelial networks. The experiment examined metabolomic responses in receiver plants following stress-induced signalling from neighbouring sender plants, with a focus on defence-related metabolic changes, including leaf isoprenoid production and pathogen-specific responses to Fusarium sporotrichoides and Botrytis cinerea. The dataset includes raw mass spectrometry files, processed data tables, metabolite annotation results, and associated sample metadata.

INSTRUMENT(S): Liquid Chromatography MS - positive - reverse-phase-c18, Gas Chromatography MS - positive - polar-polyethylene-glycol-capillary-column

PROVIDER: MTBLS14821 | MetaboLights | 2026-06-30

REPOSITORIES: MetaboLights

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			Action	DRS
	a_MTBLS14821_GC-MS_positive_polar-polyethylene-glycol-capillary-column.txt	Txt
	a_MTBLS14821_LC-MS_positive_reverse-phase-c18.txt	Txt
	i_Investigation.txt	Txt
	m_MTBLS14821_GC-MS_positive_polar-polyethylene-glycol-capillary-column_v2_maf.tsv	Tabular
	m_MTBLS14821_LC-MS_positive_reverse-phase-c18_v2_maf.tsv	Tabular

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Common mycelial network modulates neighbour-primed plant defences against foliar pathogens by co-opting distinct inter-plant metabolic and biotic stress responses.

Project description:Inter-plant communication is key for the successful thriving of plant communities in nature with yet untapped potential for agroecosystem engineering towards more resilient crops and plant defences against pathogens. Arbuscular mycorrhizal fungi (AMF) are ubiquitous root symbionts, well-known to constitute underground common mycelial networks (CMNs) linking multiple plant hosts underground. The wired connection among plants via CMNs are hypothesized to play a key role for information exchange between plants for the neighbour-primed inter-plant defences. However, the key transcriptomic and metabolome responses in receiver plant associated with inter-plant CMN connections remain yet to be elucidated. Moreover, no studies to date have clearly resolved the confounding effects of hyphal damage from the inter-plant network disconnection. To uncover the contribution of CMN integrity to neighbour-primed plant defences, we used model AMF Rhizophagus irregularis to inter-connect two Medicago truncatula plants and explored the effect of sender wounding and flg22 elicitation on receiver plants’ leaf responses and pathogen tolerance. For the first time, we demonstrate that changes in receiver plants’ biotic stress and defence signalling pathways rely on inter-plant signals via the CMN, not on mycelial network damage itself. This response was associated with distinct leaf isoprenoid production, including volatile monoterpenes and triterpene saponins. Furthermore, CMN-mediated signals from stressed senders enhanced receiver resistance to Fusarium sporotrichoides whilst simultaneously increasing susceptibility to Botrytis cinerea. Our findings highlight the critical role of CMNs in inter-plant signalling for pathogen-specific susceptibility and resistance which can be a key for understanding plant community-level defence in nature and agroecosystems.

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