Figure 5.

The hypocotyls of the gps mutants show the same gravity (or GPS) response as the inflorescence stem. Arabidopsis Ws wild-type, gps1-1, gps2-1, and gps3-1 seeds were plated onto nutrient agar, allowed to germinate, and grown vertically under full light. Four days after germination, the plates were transferred to 4°C and rotated 90° to provide gravistimulation for 1 h. The seedlings were then returned to vertical at RT and images acquired using infrared LEDs to avoid complications caused by phototropism. The arrow indicates the direction of the gravity vector in relation to the seedlings during the 4°C pretreatment. Scale bar = 1 cm.