Figure 1.

Overview of FM-v1.5. (A) Summary of how temperature influence on FT was modeled in FM-v1.0 and in FM-v1.5 (blue text) as well as the steps involved in modifying FM-v1.5 (gray text). (B) Schematic of Model FM-v1.5. Temperature (through SVP, FLM, and CO), day length, and the circadian clock regulate expression of FT in the Photoperiodism and Phenology modules per unit tissue. The leaf number and relative leaf age, outputs of the Functional Structural Plant module, are used to determine the capacity of each leaf to express FT, and leaf area is used to determine the amount of leaf tissue present. FT is summed across all leaves in a plant and added to the whole-plant FT from the previous time step. The model ceases leaf production and determines the days to bolt (DtB) when FT reaches a pre-set threshold set by using the leaf number for plants grown in long days (LD, 16-h light, 8-h dark) at 22°C, similarly to the way in which thermal units accumulate to a consistent value before a developmental transition occurs. Red illustrates where adjustments were made to the original model (FM-v1.0). The bold, italic numerals correspond to the numbers in the model description in text.