Fig. 7.

The 500 ms linear time plot of the variable fluorescence response (F ^exp(t)) in a Kalanchoë leaf upon a 50 ms sSP₅₀ (blue-colored) and a 1 s SP (red-colored), both of 3000 µmol photons m⁻² s⁻¹ intensity. The two pulses are given sequentially at an intermediate dark period of a few seconds; the 50 ms rising part of the sSP₅₀ response coincides with that of the SP response. The green open open diamonds and closed red squares are of the intermediate (k ₂) and slow (k ₃) component, respectively of the 3-exponential deconvolution of the sSP50 decay curve. Values of amplitudes (a _j) and rate constants (k _j) of each of the components are given in the insert. The red colored diamonds are of the variable fluorescence curve F ^PP(t) + F ^PE(t), after summation of the respective curves from Fig. 4 (F ^PP) and Fig. 6 (F ^PE), respectively. Note the appearance of the ultra-slow decay component ((k ₃)⁻¹ ~ 0.5 s) in the decay at 50 ms and (ii) approx. equal size of the rate constant k2 in the sSP₅₀ decay and k3 in the sSP₁₀ decay (see Fig. 5)