Figure 1.

Temperature-induced hypocotyl elongation in Arabidopsis. Nine-day-old Arabidopsis seedlings were grown under continuous light at either 20°C (a–e) or 29°C (f–j). Col (a and f); axr1–12 (b and g); 35S-iaaLys (c and h); tir3–1 (d and i); Col grown on medium supplemented with 1 μM NPA (e and j). (Bars = 2 mm.)