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Linking soil's volatilome to microbes and plant roots highlights the importance of microbes as emitters of belowground volatile signals.

Environmental Microbiology, 21, (9), 2019, 3313-3327.

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Lien: Wiley Online Library

Résumé:

Plants and microbes relea se a plethora of volatiles that act as signals in plant–microbe interactions. Characterizing soil’s volatilome and microbiome might shed light on the nature of r elevant volatile signals and on their emit-ters. This hypo thesis was tested by characterizing plantcover, soil’s volatilome, nutrient content and microbiomes in three grasslands of the Swiss Jura Mountains. The ﬁngerprints of soil’s volatiles were gen erated by solid-phase micro-extraction gas chromatography/mass spectrometry, whereas high-throug hput sequencing was used to create a snapshot of soil’s microbial communities. A high similarity was observed in plant communities of two out of three sites, which was mir- rored by the soil’s volatilome. Multiple factor analysis evidenced a strong association among soil’s volatilome, plant and microbial communities. The proportion of volatiles correlated to single bacterial and fungal taxa was higher than for plants. This suggests that those organisms might be major contributors to the volatilome of grassland soils. These ﬁndings illustrate that key vola- tiles in grassland soils might be emitted by a handful of organisms that include speciﬁc plants and microbes. Further work will be needed to unravel the structure of belowground volatiles and understand their implications for plant health and development.

ISSN Print 1462-2912
ISSN en ligne: 1462-2920
Digital Object Identifier (DOI): https://doi.org/10.1111/1462-2920.14599
ID publication (Code web): 42038 Envoyer par e-mail