Fig. 7.

Expression profiling of auxin-responsive genes regulated by iaa1 in various arf and tir1/afb mutant backgrounds. arf mutant seedlings were incubated with mock (–) or auxin (+) for 2 h in the light, followed by RNA-gel blot analysis with the indicated DNA probes. The transcript levels were determined as described in the Fig. 3 legend. T and Q indicate tir1 afb2 afb3 triple mutants and tir1-1 afb1 afb2 afb3 quadruple mutants, respectively.