Fig. 4.

Variations in leaf reflectance indices in water-stressed and watered (control) plants, were calculated from the derived spectral reflectance curves. Normalized difference vegetative index, NDVI (a), modified normalized difference vegetative index, mNDVI (b), Photosynthetic reflectance index, PRI (c), plant senescence reflectance index, PSRI (d), and cold hard band, CHB (e). Data represent the means ± SD of five separate measurements. Statistical significance is indicated as (*P < 0.05), (**P < 0.001) and (***P < 0.0001)