Figure 1
Variations in cell length (μm), occurrence rate of cell nuclei (%), four endogenous hormones concentrations for P. heterocycla culm at different developmental stages and internodes. Abscisic acid (ABA: ng/g), indole acetic acid (IAA: μg/g), gibberellic acid (GA3: ng/g) and zeatin riboside (ZR: ng/g). Four developmental stages or three developmental internodes were defined according to the different unearthed heights of individual plants (0.05, 1.00, 6.00 or 12.00 m; nominated as G1M–G4M, respectively) or different portions (basal internode, G3B; middle internode, G3M; and top internode, G3T) of the same culm (at the G3M stage), respectively. Each data point represents the mean of three biological replicates and three experimental replicates. Different letters on a column with the same pattern indicate significant differences at P ≤ 0.05 according to the LSD test. Bars represent SE (n > 150 in cell length and occurrence rate of cell nuclei; n = 9 in four endogenous hormones concentrations).