Principal component analysis (PCA) showing the relationship between reduced glutathione (GSH), oxidized glutathione (GSSG), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), content of chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoids (Car), chlorophyll a/b ratio (Chl a/Chl b), carotenoids/total chlorophyll ratio (Car/Chl a + Chl b), maximum quantum yield of primary photochemistry (TR0/ABS) measured at 10 days post inoculation (dpi), performance index on absorption basis (PIabs) measured at 10 dpi, abscisic acid (ABA), salicylic acid (SA), and type II resistance (Resistance) in the control (blue colored) and FHB-stressed (red colored) spikes of six winter wheat varieties (Golubica, Tika Taka, El Nino, Kraljica, Galloper, and Vulkan).