Figure 4.

Relationship between aging rate and τ_R for Impatiens seeds (■), pea seeds (○) and Typha pollen (▴). Aging rates were determined under conditions of different mcs and one constant temperature (pea seeds, 65°C; Typha pollen, 35°C; Impatiens seeds, 25°C). Aging rates from Typha pollen were taken from ref. 12, and those of pea seeds from ref. 3. Aging rates for all species represent the absolute value of the slope of the linear regression fitted to percentage germination plotted on a probability scale over storage time. Data were plotted on a double logarithmic scale {log y = a + b log x}. Equation constants and correlation coefficients of the linear regressions are: pea seeds, a = 2.82, b = −2.40, r² = 0.972; Typha pollen, a = 5.16, b = −3.13, r² = 0.965; and Impatiens seeds, a = 2.73, b = −2.56, r² = 0.987.