. (A) Endogenous levels of ABA (ABA + trans-ABA), (B) phaseic acid (PA), (C) dihydrophaseic acid (DPA), (D) ABA glucose ester (ABA-GE), and (E) ratio of oxidation products of ABA (PA + DPA) to ABA and ratio of conjugated ABA (ABA-GE) to ABA in shoot tips of poinsettia (cv. Christmas Eve) exposed to 30 min red (R) and far-red (FR) light at the end of the day (EOD) (10 h main lighting period) for 11 weeks. Mean values ± SE are given. n = 3 with three pooled shoot tips in each. Mean values with different letters within subfigures are significantly different based on ANOVA followed by Tukey’s test at p ≤ 0.05. The effect of EOD treatment on ratio of oxidation products to ABA and conjugated ABA to ABA was analysed separately (subfigure E).