Applications for DIVING-PAM-II

Figure 2: Spectra of PAR above canopy (red line) or below canopy (black line) normalized at 870 nm. The spectra demonstrate how markedly leaf absorption affects the intensity ratios “visible/far red”. Phytochrome photoreceptors specially sense to the red/far red ratio. These photoreceptors trigger many plant processes.

Figure 3: Reflectance spectra of a green and red (anthocyanin-containing) leaf. The maximum at 550 nm of the green spectrum corresponds to the so-called “green gap” of leaves at which pigment absorption is low. The red line shows how that the green gap disappears in the presence of light-screening anthocyanins.

Figure 4: Fluorescence emission spectra of ivy leaves normalized to their long-wavelength maximum. Fluorescence at wavelength < 700 nm decreases from the light green to the dark green leaf probably due to increasing fluorescence reabsorption inside the sample (Buschmann C (2007) Photosynth Res 92, 261–271).