Materials and Methods
Plant Growth Conditions and Mutant Characterization
Arabidopsis Columbia (Col-4) wild-type plants were obtained from the Arabidopsis Biological
Resource Center (ABRC). Two T-DNA insertion mutants for Arabidopsis CGL160 (gene ID
At2g31040) were obtained: SALK_057229 (later on called cgl160-1) and WiscDsLoxHs024_02B
(later on called cgl160-2). Plants were grown on soil under long day conditions (16 h light, 8 h
dark) and under short-day conditions (8 h light, 16 h dark) at 120 μmol photons m-2 s-1 in a
Conviron growth chamber (model MTR26) equipped with light bulbs from Philips (Master
TL-D 58W/840). For fluctuating low/normal light growth conditions, plants were illuminated
for 5 min with 120 μmol photons m-2 s-1, followed by 5 min of illumination with 20 μmol photons
m-2 s-1. This pattern was repeated during the complete 16 hours photoperiod. The day temperature
was set to 22°C, night temperature was 16°C. Relative humidity was 60% during the
day and 75% during the night. Mutant plants were screened by PCR for heterozygosity or homozygosity
of the T-DNA insertion using primers 057229_Forward and 057229_Reverse
for SALK_057229, primers WiscHs024_Forward and WiscHs024_Reverse for WiscDsLoxHs024_
02B and T-DNA left border primers LBb1 and WiscDsLoxHS for SALK and Wisc
lines, respectively. DNA fragments were amplified by 40 cycles of denaturation at 94°C for 1
min, annealing at 54°C for 55 s and polymerization at 72°C for 1 min followed by a final extension
for 10 min at 72°C (S1 Table).