Fig. 6
Comparative analysis of canopy reflectance (R) and its first derivative (Rʹ) for changing canopy cover conditions of healthy plants versus stressed plants. For the control setup, VNIR screening under dark-adapted conditions images along the steps (panel a), dark-adapted canopy reflectance (Rdark) (panel b), and its first derivative (Rʹ) (panel c) are shown according to the number of pixels analyzed of each step (mean, n = 20 plant areas). For the water deficit setup, the temporal evolution of the quantum yield (QY) results is shown by tray images (panel d) and by its mean (± standard deviation, n = amount of pixels in y-axis) (panel e). The evolution of the VNIR spectral characteristics over time is shown for R (panel f) and Rʹ (panel g).
