Stem growth and potential re-growth of WT and evg plants after transferring to SD. Stem growth (increase in length) was measured one week prior and eight weeks after transfer of WT and evg plants from LD (16 h light) to SD (8 h light) photoperiod conditions and potential re-growth when WT plants are transferred back to LD conditions. The day of treatment change to SD conditions is named week 0. Data are mean ± SE of 29 and 15 replicates for WT and evg, respectively. Growth elongation significance between paired dates is indicated: not significant, not showed; *, P < 0.05, ***, P < 0.001.