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Fig. 4. Auxin response gradients in gnomR5 root tips break down upon auxin treatment. DR5::GUS signals in (A-D) wild type, (E-H) gnomR5. (A,E) Untreated, (B,F) 0.1 µM NAA, (C,G) 1 µM NAA, (D,H) 10 µM NAA. Treatment was done for 24 hours. Note that DR5::GUS response gradients are severely affected at 1 µM NAA in gnomR5 (G), whereas in wild type a comparable change can only be observed at tenfold higher concentration (D).