Quantitation of morphological traits of GL-3, MdMYB88, or MdMYB124 overexpression plants, and MdMYB88/124 RNAi plants under long-term drought conditions. A, Plant height. B, Stem diameter. C, Dry weight of roots. D, Dry weight of stem. E, Root-to-shoot ratio. Plants were subjected to long-term drought stress for 2 months in a greenhouse. Data are means ± sd (n = 9). One-way ANOVA (Tukey test) was performed, and statistically significant differences are indicated by *P < 0.05 or **P < 0.01.