Figure 1.

Metabolic circular economy in the rhizosphere. A, Schematic representation of chemical allocation in the phytobiome. The microbiome–root–shoot–environment nexus is based on a metabolic circular economy that influences rhizosphere interactions where metabolites are exchanged (i.e. consumed, reused and redecorated [redesigned]) by different rhizosphere microbiome members. B, SIREM leads to shifts in the chemical diversity in the rhizosphere and is microbiome-driven. SIREM (blue arrows) is a mechanism of the metabolic circular economy system (red and purple arrows). SIREM-related acylsugar exudation is induced by the soil bacterium B. subtilis.