A Network of Phosphate Starvation and Immune-Related Signaling and Metabolic Pathways Controls the Interaction between and the Beneficial Fungus .

The beneficial root-colonizing fungus mediates plant growth promotion (PGP) upon phosphate (Pi) starvation in . This activity is dependent on the Trp metabolism of the host, including indole glucosinolate (IG) hydrolysis. Here, we show that resolves several Pi starvation-induced molecular processes in the host, one of which is the downregulation of auxin signaling in germ-free plants, which is restored in the presence of the fungus.