[en] Background
Aboveground, plants release volatile organic compounds (VOCs) that act as chemical
signals between neighbouring plants. It is now well documented that VOCs emitted by
the roots in the plant rhizosphere also play important ecological roles in the soil
ecosystem, notably in plant defence because they are involved in interactions between
plants, phytophagous pests and organisms of the third trophic level. The roles played
by root-emitted VOCs in between- and within-plant signalling, however, are still poorly
documented in the scientific literature.
Scope
Given that (1) plants release volatile cues mediating plant-plant interactions
aboveground, (2) roots can detect the chemical signals originating from their
neighbours, and (3) roots release VOCs involved in biotic interactions belowground,
the aim of this paper is to discuss the roles of VOCs in between- and within-plant
signalling belowground. We also highlight the technical challenges associated with the
analysis of root-emitted VOCs and the design of experiments targeting volatile-mediated
root-root interactions.
Conclusions
We conclude that root-root interactions mediated by volatile cues deserve more
research attention and that both the analytical tools and methods developed to study
the ecological roles played by VOCs in interplant signalling aboveground can be
adapted to focus on the roles played by root-emitted VOCs in between- and within-plant
signalling.
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