Effect of Trichoderma strains on physio-morphological parameters: (a) aerial length, (b) shoot fresh weight, (c) shoot dry weight, (d) root length, (e) root fresh weight, (f) root dry weight, (g) leaf chlorophyll content, (h) Leaf NBI, and (i) Leaf epidermal flavonols content of wheat plants (Khiar variety) after 21 days of cultivation in greenhouse conditions. White bars: control condition (C), which corresponds to healthy plants from seeds treated with sterile PDB (C); Black bars: plants from seeds inoculated with Trichoderma isolates; Red bars: plants inoculated with F. culmorum (Fc) or co-inoculated with F. culmorum and Trichoderma isolates. Data correspond to the mean of twenty plants. Bars represent the biological standard error. Distinct letters in the same column indicate significant differences (p ≤ 0.05).