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Fig. 2. Seasonal dynamics of pollen shed intensity for hybrids Pioneer 3978 (P3978; a,c) and Pioneer 3925 (P3925; b,d). (a,b) Observed (symbols) and predicted (lines) rates of pollen shed at four levels of male fertility (MF). (c,d) Daily pollen shed rates normalized per fertile plant (symbols) and Gauss functions fit to the normalized data (lines). Vertical lines are standard errors for four measurements. Note that a single curve describes the seasonal pattern of pollen shed for each hybrid.
