Fig. 1

The kinetics of poplar AR development from DAE0 to DAE8 (a), mean AR from DAE0 to DAE8; (b), mean AR primordium percent investigated by anatomy. At least the basal region of 15 plantlets was collected for each time point and at least 10 cross sections (> 50 cross sections were prepared and 10 were randomly selected) were used per cutting. The AR percentage was calculated considering the number of sections with AR primordia in each cutting in comparison with the total number of sections analyzed per cutting. Significant difference among multiple comparisons were labeled as different letters above the dot in a and bar in b (P = 0.05)