Figure 2.

Effect of potassium humate (KH60) in two stages of A. thaliana development: (a) fully expanded green cotyledons (b) vegetative growth under control conditions (no stress), and saline (NaCl and LiCl) and osmotic (mannitol) stress. Optimal KH60 concentration used was 1.6 mg/mL (w/v) for germination and 0.4 mg/mL (w/v) for vegetative growth. The application of KH60, during vegetative growth, was carried out 3 days after the transplant, and fresh weight was measured when the plants showed a fully developed rosette stage. The X-axis indicates the different concentrations of abiotic stressors. The Y-axis represents (a) the percentage of expanded green cotyledons and (b) the fresh weight (mg) of plants grown to full rosette. n = 30 for each individual bar. Bars represent the standard error. * p < 0.05 and ** p < 0.01 by Student’s tests for the target sample compared to the control sample under the same conditions.