Li and Xue, Supplemental Figure 1 IAA 0 1 nM 10 nM 100 nM 1 µM WT pldz2 WT pldz2 WT pldz2 WT pldz2 WT pldz2 B 50 45 * WT 40 * * pldz2 35 * tir1-1 30 * Primary root length (mm) 25 20 * 15 10 5 1 nM 10 nM 100 nM 1 µM IAA concentration Supplemental Figure 1. Pldz2 is Less Sensitive to Exogenous Auxin. Phenotypic analysis revealed that pldz2 seedlings were relatively less sensitive to auxin treatment. Nine-day-old seedlings were used for observation. Bar=1 cm. Measurement of root length indicated the reduced auxin responses of pldz2 seedlings. Auxin insensitive mutant tir1-1 was used as a positive control. Nine-day-old seedlings were used for measurements. Error bars represent SE (n>30) and statistical analysis was performed using a one-tailed Student’s t test (*, P<0.01).