Figure 5.

Induction of etr1-1 expression from tomato hemizygous (Hemi) for the etr1-1 transgene confers a similar level of ethylene insensitivity as tomato homozygous (Homo) for the etr1-1 transgene. Line 2-18 was used to generate seeds hemizygous for the etr1-1 transgene following crosses with wild-type (WT) plants. Hemizygous 2-18 seeds, homozygous 2-18 seeds, and wild-type seeds were germinated in the dark for 10 d on medium with 20 μm ACC and 20 μm DBAH to assay for their triple response. Three representative seedlings are shown for each line. Quantitative measurements for hypocotyl and root lengths with sd are shown in the histograms to the right of each panel. Ten to 20 seedlings were used for each measurement. The P values represent the statistical significance between each starred bar relative to the wild-type control: * P < 0.001, ** P < 0.005, *** P < 0.05.