Figure 2.

A time course study of RT-PCR analysis of selected β-amylase genes under heat and cold shock. Eighteen-day-old Arabidopsis plants grown at 20°C were exposed to 40°C for 0, 30, 60, 120, and 240 min for heat shock and to 5°C for 0, 6, 24, 48, 96, and 192 h. Controls were kept at 20°C. The arrowheads indicate the 18S rRNA internal control. Representative images are shown from one of the three experiments.