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Fig. S1 Elongation rate of primary roots of rice or wildtype Arabidopsis (Col-0) under water stress.

Fig. S2 Elongation rate of primary roots in rice or wildtype Arabidopsis (Col-0) exposed to different concentrations of ABA.

Fig. S3 Transcript abundance of AUX1 or PIN2 in the root tip (0–5000 μm from the root cap junction) of wildtype Arabidopsis plants (Col-0) under moderate water stress or exogenous ABA treatment.

Fig. S4 Distribution and abundance of auxin or auxin transport carrier (AUX1 or PIN2) in the root tip of wildtype Arabidopsis under moderate water stress or exogenous ABA treatment.

Fig. S5 Root tip adaptation of different Arabidopsis natural accessions under moderate water stress.

Fig. S6 Root tip response of rice plants under moderate water stress.

Table S1 Gene-specific primers used for PCR

Table S2 Absolute data of controls (rice or Arabidopsis), which are expressed as 100% in Figs 3-7