Relative expression levels of YUCCA8, PRE1, IAA19, YUCCA9, GH3.3, and PAR1 in Col-0, pif7-1, mrg1mrg2, and pif7-1mrg1mrg2 under white light or shade treatment conditions. RNA prepared from seedlings grown under white light for 4 d and maintained in white light or transferred to shade for 1 h. The expression levels were normalized to the internal control AT2G39960. Error bars represent se from three independent biological replicates. Asterisks indicate where the difference between Col-0 and mutant under shade is statistically significant (**P < 0.01).