Fig. 4. Effects of drought stress treatment on carbohydrate contents in poplars. (A) Glucose. (B) Fructose. (C) Sucrose. (D) Total soluble sugars. (E) Starch. Values are means ± SDs of three independent measurements. Different letters indicate significant differences, and “n.s” indicates not significant (a lower-case letter for P. alba × P. davidiana and a capital letter for P. davidiana based on ANOVA with Tukey’s HSD, P < 0.05).
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