Fig. 2From: MdFRK2-mediated sugar metabolism accelerates cellulose accumulation in apple and poplarSugar concentrations in the stems of the transgenic apple plants overexpressing MdFRK2. Sucrose, fructose, glucose and galactose concentrations were measured in wild-type WT and transgenic OE-4 and OE-9 lines. Bars represent the mean value ± SE (n ≥ 3). Asterisks indicate significant differences at P ≤ 0.05Back to article page