Skip to main content
. 2013 Apr 30;11(4):e1001550. doi: 10.1371/journal.pbio.1001550

Figure 1. Petal growth analysis.

Figure 1

(A) Section of a petal primordium around day 0 DAP (days after primordium formation) (width, 35 µm). (B) Petals at 10 DAP and 12 DAP (some sepals overlying the petals have been removed). (C) Standard flower 1 petal width (natural logarithm scale) against time (black asterisks) and fitted logistic curve (red dotted line) from initiation until maturity; time in days after primordium formation (DAP). The gradient of the curve is the growth rate in width. Dashed lines indicate average petal width at 2-d interval as estimated with the fitted curve: ∼30 µm (0 DAP), 90 µm (2 DAP), 180 µm (4 DAP), 315 µm (6 DAP), 520 µm (8 DAP), 820 µm (10 DAP), and 1,265 µm (12 DAP). These time points can be related to previously defined flower stages [24] as follows: stages 5–6 (before 0 DAP), stages 7–9 (between 0–2 DAP), stage 10 (between 4–6 DAP), stages 11–12 (between 6–8 DAP), and stage 13 (10 DAP). (D) Petal length plotted against width during petal development (natural logarithm scales). The gradient of the fitted line is 0.78, showing that growth rate in width is less than in length. For comparison, the dotted green line has a gradient of 1. Scale bar, 20 µm (A), 1 mm (B).