English: Time lapse of WT, Pol1A−/−, and Pol1B−/− plants growing side by side. In this video, plants can be seen growing at slightly different rates based on their mutation. The plants in the first frame are 7 dpi (days post-imbibition). Black frames represent times when lights were turned off to simulate the night cycle. In total, the plants can be seen growing from 7 dpi to 32 dpi. In this video, no difference is noted between WT and Pol1A−/− plants. However, Pol1B−/− plants can be seen lagging slightly behind WT and Pol1A−/−. This delay is most pronounced when plants begin to put up shoots.