Vol. 2, 2017

Original research papers

Biophysics

THE EFFECT OF PLANT DISEASES ON HYPERSPECTRAL LEAF REFLECTANCE AND BIOPHYSICAL PARAMETERS

Dora Krezhova, Kalinka Velichkova, Nikolai Petrov, Svetla Maneva

Pages: 269-275

DOI: 10.21175/RadProc.2017.55

Contemporary remote sensing techniques have acquired new and more advanced applications in environmental and ecological researches. Hyperspectral remote sensing data provide significant advancement in understanding the subtle changes in biophysical and biochemical parameters of the plants and their responses to adverse environmental conditions. In this study, a remote sensing method based on hyperspectral measurements of leaf reflectance was used to extract information on the effect of biotic stress (two viral infections) on young potato plants. The reflectance data were collected by means of a portable fiber-optics spectrometer in the visible and near-infrared spectral ranges (400 –1100 nm). To translate the hyperspectral data into information about plant biophysical and biochemical variables, an empirical-statistical approach was applied based on Student’s t-test, first derivative, and serological analyses. The changes in some important biophysical parameters such as color and spectral signature of plants, chlorophyll absorption characteristics, moisture content, etc., were analyzed. The results showed that the variations in the chlorophyll content, leaf structure, and water content dominate in the reflectance variance in the green, red, and near-infrared spectral ranges. Comparative analysis was performed between the results from the leaf spectral reflectance and serological test (DAS-ELISA) for the presence and degree of the viral infections.
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