Figure 10.

Modulation of ethylene biosynthesis and root hair development. A, Δgen1.1/GUS tomato seeds were germinated on control medium. At a primary root length of 3 to 5 mm, control seedlings were transferred to fresh medium for 2 d before GUS activity was assayed. B, Seedling root grown in presence of 20 μm AVG and stained for GUS activity after pretreatment as described in A. C, Ectopic root hairs 2 d after transfer to medium containing AVG and 1 mm ethephon. Bar in A = 1 mm; bar in B = 0.5 mm; bar in C = 0.2 mm.