Figure S1. PR length analysis of NIP and mutant osarf16 under auxin and PATIs.

Figure S2. The LR phenotypes of NIP, osarf16, and Ov16 under CK and IAA, 2,4-D and NPA treatments.

Figure S3. The AR phenotypes of NIP and osarf16 under CK and NOA treatment.

Figure S4. The RH phenotypes of NIP, osarf16, and Ov16 under CK, 2,4-D and NPA treatments.

Figure S5. Soluble Fe contents in leaves and roots of NIP and osarf16.

Figure S6. Analysis of OsARF16 promoter sequences and OsARF16 expression in NIP, OsPHR2-RNAi and OsPHR2-Ov transgenic lines.

Table S1. Primer sequences for the OsARF16 gene.

Table S2. Primers sequences for the auxin synthetase genes.

Table S3. Primer sequences for the auxin influx, OsAUX and efflux transporter, and OsPIN gene families.

Table S4. Primers sequences for the expression of genes related to the P signal.

Table S5. Probe set ID of 201 auxin upregulated genes.

Table S6. Response to−Pi in NIP and osarf16.

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