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Daily trend of ABA (ABAleaf, A), ABA-GE (ABA-GEleaf, B), ABA catabolites (PA+DPAleaf, C) and NCED3 expression (NCED3leaf, D) in leaves of Populus nigra plants subjected to well-watered (WW, open circles), moderate water stress (WS1, grey circles) and severe water stress (WS2, black circles) conditions. Data (means ± s.d., n = 4) were subjected to one-way ANOVA; different letters indicate significant differences between groups at a significance level of P < 0.05 using Tukey’s test.
