3.3.4. Stress Biomarkers

The results in (Figure 4) showed that pepper *Fusarium* wilt disease resulted in a rise in phenolics over the healthy control plant. On the other hand, it was observed that infected plants treated with cyanobacteria exhibited a significant increase in phenolics over the infected control plants. The data (Figure 4) indicated that the highest increase in phenolics level was recorded by the infected plants treated with *A. platensis* in the soil treatment. It was observed that cyanobacteria supplementation reduced the generation of H2O2 and lipid peroxidation (MDA) significantly over the infected control plants (Figure 4). Accumulation of H2O2 increased in infected control plants, causing an increase in lipid

peroxidation (MDA) over the healthy control plants. Supplementation of infected plants with cyanobacteria reduced the generation of H2O2 over the infected control plants leading to a declined lipid peroxidation (MDA) (Figure 4). The data revealed that the most effective cyanobacterial treatment was foliar spraying with *A. platensis*.

**Figure 4.** Effect of cyanobacteria on total phenol, Malondialdehyde (MDA), and H2O2 contents of infected pepper plants (T1-healthy control, T2-infected control, T3-infected plants treated with *D. muscorum* soil, T4-infected plants treated with *A. oryzae* soil, T5-infected plants treated with *A. platensis* soil, T6-infected plants treated with *D. muscorum* foliar spray, T7-infected plants treated with *A. oryzae* foliar spray and T8-infected plants treated with *A. platensis* foliar application.) (Data represent mean ± SD, n = 3), (a–e Letters revered to significant in statically analysis).
