qRT-PCR analysis of natural auxin response gene expression in wild-type seedlings and seedlings expressing IAAmImII constructs. Levels of gene expression are shown relative to the wild type. Lanes are as follows: a, the wild type; b, 35S:IAA17mImII-1; c, 35S:IAA3mImII-1; d, 35S:IAA6mImII-1; e, 35S:IAA19mImII-1; f, IAA19:IAA19mImII-1; g, 35S:IAA12mImII-2.