Prof. Ing. Marián Brestič, CSc., and doc. Ing. Marek Živčák, PhD., from the Faculty of Agrobiology and Food Resources of the Slovak University of Agriculture in Nitra received the prestigious world award Highly Cited Researchers 2020, which ranks them among the absolute world leaders (top 0.1% of researchers) in the field of Plant and Animal Sciences. Experts in the field of ecophysiology and stress physiology of crops have long been concerned with the effects of environmental stressors on the photosynthetic apparatus of plants and the application of non-invasive methods in the diagnosis of functional state of plants.