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Highlights:• We use rRNA-SIP to trace the succession of the uptake of plant-derived carbon flows across all relevant microbial kingdoms (bacteria, fungi, protists) in the rhizosphere of maize.• 13 C-labeling of mycorrhizal Paraglomerales and several bacteria including Opitutus, Mucliaginibacter and Massilia spp. was especially apparent in soil surrounding the strict rhizosphere after 5 d, highlighting the pivotal role of AMF as a rapid shunt of fresh plant assimilates to microbes outside the strict rhizosphere.• Labeling of filamentous saprotrophic Ascomycota or Basidiomycota was not apparent, challenging proposed "sapro-rhizosphere" concepts.

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