FIGURE 6 Effects of the drought treatment on phytohormone levels in the two cotton varieties. Statistical analysis of (A) gibberellin, (B) zeatin riboside, (C) indole-3-acetic acid, (D) brassinolide, and (E) abscisic acid contents at the 3 cm, 6 cm, 9 cm, and 12 cm segments from the taproot tips of the ”Guoxin 02” and ”Ji 228”. DT type, Drought-tolerant type ”Guoxin 02”; DS type, Drought-sensitive type ”Ji 228”; NS, no-stress; DS, drought stress. Error bars represent standard errors of the means. P >0.05, no significance (ns); P <0.05, significant difference (*);P <0.01, highly significant difference (**). Different lowercase letters in the figure indicate significant differences between different root segments under the same treatment (P ≤ 0.05).