PLANT BIOLOGY. For the article “Identification of inhibitors of auxin transcriptional activation by means of chemical genetics in Arabidopsis,” by Joshua I. Armstrong, Shiaulou Yuan, Joseph M. Dale, Vanessa N. Tanner, and Athanasios Theologis, which appeared in issue 41, October 12, 2004, of Proc. Natl. Acad. Sci. USA (101, 14978–14983; first published October 4, 2004; 10.1073/pnas.0404312101), Fig. 1 contains an erroneous depiction of compound D. This problem appears to be a result of an internal database error early in our studies that propagated the incorrect structure throughout our figure preparation process. This correction does not affect the conclusions of the article. The corrected figure and its legend appear below.
Fig. 1.
A high-throughput screen for auxin signaling inhibitors. (A) BA3 seeds expressing GUS from an auxin-sensitive promoter were arrayed into 96-well microfilter plates (5–10 seeds per well) and grown in liquid culture for 5 days. Incubation of the seedlings with 5 μM NAA results in the tissue-specific expression of GUS in the root elongation zone, easily visualized after incubation with 5-bromo-4-chloro-3-indolyl β-d-glucuronide (X-gluc). The inclusion of an inhibitor of auxin signaling prevents GUS expression. (B) Structures of the four inhibitors, compounds A–D, chosen for detailed analysis.