Figure 6. A schematic representation of the relationship between kernel number per plant and plant growth rate during the period bracketing silking (PGR_S) for a hybrid (solid black line), Inbred line 1 (dashed line) and Inbred line 2 (solid gray line), showing differences in PGR_S threshold for kernel set (T), initial slope of the relationship between kernel number and PGR_S (S), and asymptote or potential kernel number per plant (A). (Adapted from Echarte and Tollenaar, 2006; Tollenaar and Lee, 2006).