Fig. 1. The mine mutant shows root-specific insensitivity to ACC.
Fig. 2. The mine mutant exhibits normal growth responses to IAA.
Fig. 3. The mine mutant shows aberrant expression of auxin maxima monitored by DR5 under ACC treatment.
Fig. 4. Genetic analysis of ethylene-induced auxin biosynthesis in mine roots.
Fig. 5. The mine mutant exhibits retarded root growth under normal growth conditions.
Fig. 6. The MINE gene encodes the PNP/PMP oxidase, PDX3.
Fig. 7. Ethylene-insensitive responses of mine roots are restored by IAA, but not by Trp.
Fig. 8. A schematic model for the involvement of MINE/PDX3 in ethylene-induced auxin biosynthesis.