Figure 3.

Effect of mutant ETR1 receptors upon the triple response of dark-grown seedlings. Phenotypes of 4-d-old seedlings grown in 35 μL L⁻¹ ethylene are shown. Representative seedlings from three independent lines for each transgene are shown. The level of immunodetectable full-length receptor for each of the plant lines was determined by western-blot analysis using the anti-ETR1(401–738) antibody. A, Response of wild type (WT), the ethylene-insensitive mutant etr1-1, and the loss-of-function mutant etr1-7 to ethylene. B, Ethylene response of the wild-type Arabidopsis transformed with ETR1, ETR1(G2), etr1-1, and etr1-1(G2). C, Ethylene response of the loss-of-function etr1-7 line transformed with ETR1, ETR1(G2), etr1-1, and etr1-1(G2).