Fig. 6

a Heat map and b Principal component analysis (PCA) showed the morphological, photosynthetic, biochemical, and ion contents in both cultivars of wheat. All measured indices abbreviations were seen in the caption of Fig. 5. while in the treatments group the T1, T2, T3, and T4 represent the control, TU-spray, cobalt stress and TU + cobalt stress respectively. The V1 and V2 represent the wheat cultivars, FSD-2008 and Zincol-2016 respectively