Figure 6.

Expression of etr1^1-349 restores ethylene insensitivity conferred by dominant receptor mutant alleles in the ctr1-1 background. A to C, Seedling hypocotyl length of ctr1-1 and ethylene-insensitive receptor mutants (A), double mutants of ctr1-1 with an ethylene-insensitive receptor mutation (B), and double mutants expressing etr1^1-349 (C). D, Phenotype of light-grown seedlings of ctr1-1 and ethylene-insensitive receptor mutants. E and F, Phenotype of double mutants of ctr1-1 with an ethylene-insensitive receptor mutation, with and without the etr1^1-349 transgene, at seedling (E) and rosette (F) stages. G to I, Relative ERF1 expression in ctr1-1 and each ethylene-insensitive receptor mutant (G), ctr1-1 with an ethylene-insensitive receptor mutation (H), and double mutants expressing etr1^1-349(I). J, Relative etr1^1-349 transgene expression in the transgene donor (ctr1-1 L10) and recipients (the double mutants). K, Difference in expression (by Fisher’s lsd) of the etr1^1-349 transgene for double mutants and transgene donor. Data are means ± sd. ** P < 0.01 by Student’s t test. [See online article for color version of this figure.]