Fig. 4From: MdFRK2-mediated sugar metabolism accelerates cellulose accumulation in apple and poplarSugar concentrations in the stems of transgenic poplar plants stems overexpressing MdFRK2. Sucrose, fructose, glucose and galactose concentrations were measured in wild type and transgenic OE#1, OE#4 and OE#9. Bars represent the mean value ± SE (n ≥ 3). An asterisk indicates significant differences at P ≤ 0.05Back to article page