FIGURE 3 Effects of the drought treatment on the root metabolic
costs of cotton. Statistical analysis of (A) phosphofructokinase, (B)
malate dehydrogenase, (C) glucose-6-phosphate dehydrogenase, and (D)
root respiration activities at 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; C, varieties; D, drought. Error
bars represent standard errors of the means. P >0.05,P <0.05 and P <0.01 indicate no significance (ns),
significant difference (*) and highly significant difference (**),
respectively. Different lowercase letters in the figure indicate
significant differences between different root segments under the same
treatment (P ≤ 0.05).