Fig. 3.

Effect of exogenous GA treatment on floral organ lengths of wild-type (Col-0) flowers during early flowering. Mean floral organ lengths of newly opened (stage 13) wild-type (Col-0) flowers across flower positions 1–10 and position 15 under control growth conditions (−GA, black) and exogenous GA treatment (+GA, white), showing stamen length as a percentage of pistil length (a) and absolute lengths (in mm) of pistils (b), stamens (c), petals (d) and sepals (e). Flower position 15 is included as an indicator of floral organ growth in later flowering. Values shown are the mean of four independent flowers ± S.E. Significant differences (p < 0.05) between control growth conditions and GA treatment within each flower position are denoted by asterisks. Statistical analyses of stamens and petals were performed on a transformed scale (see “Materials and methods” and Online Resource 4). Statistical comparison of sepal lengths was not valid in the absence of a significant interaction between genotype, GA treatment and flower position (see Fig. 2)