Figure 5.

eer1 hypocotyls have an enhanced response to ethylene agonists. A, Propylene dose response curves for hypocotyl length of 3.5-d-old dark-grown wild-type and eer1 seedlings grown in the presence of 10 μm AVG. Left, Actual hypocotyl length. Middle, Relative inhibition of hypocotyl length (length/length at 0 μL L⁻¹ ethylene) with the concentration of propylene causing 50% inhibition denoted by (- - -). Right, The ratio of eer1 hypocotyl length over wild-type hypocotyl length for each propylene concentration with (- - -) denoting the predicted ratio if the eer1 mutant were not propylene responsive. Mean ± se values were determined from 25 to 30 seedlings. B, Hypocotyl length was measured for dark-grown wild-type and eer1 seedlings exposed to either 229 μL L⁻¹ NBD, air, or 1 μL L⁻¹ ethylene for 3.5 d. Mean ± se values were determined from 25 to 30 seedlings.