Fig. 7
Genetic transformation efficiency of in vitro materials at different differentiation culture times. A The number of regenerated shoots after differentiation culture of poplar leaves; B the number of rooted seedlings after differentiation culture of poplar leaves; C the number of positive plants after differentiation culture of poplar leaves; D transformation efficiency after differentiation culture of poplar leaves; E the number of regenerated shoots after differentiation culture of poplar stem segments; F The number of rooted seedlings after differentiation culture of poplar stem segments; G the number of positive plants after differentiation culture of poplar stem segments; H transformation efficiency after differentiation culture of poplar stem segments; I the number of regenerated shoots after differentiation culture of tobacco leaves; J the number of rooted seedlings after differentiation culture of tobacco leaves; K the number of positive plants after differentiation culture of tobacco leaves; L transformation efficiency after differentiation culture of tobacco leaves. The data presented are the mean ± standard deviation (SD) of three replicates. Bars with different letters are significantly different based on one-way ANOVA analysis (P < 0.05)