GI expression and flowering time phenotype in transgenic (TG) and control Arabidopsis plants under long day conditions in response to application of the steroid dexamethasone (DEX). a) GI transcript accumulation was measured using qRT-PCR. Relative transcript abundance 10 h after lights on is shown with levels normalised to ACTIN2 (mean +/- SD of 2 qRT-PCR runs is shown). b) Photographs of 41 day old TG2 and control plants (Col and gi-2 mutant plants) treated with DEX (+DEX) or control solutions (-DEX) from the time of imbibition. The pink dots on the leaves were made to assist with leaf counts.