Microalgae, such as Chlorella vulgaris Beijerinck (green algae), are beneficial microscopic organisms that may help plants to improve nutrient uptake, growth, and abiotic tolerance to stressors. The current study was performed to investigate the effectiveness of algae (Chlorella vulgaris Beijerinck) foliar applications [1%, 3%, or 5% (v/v)] on mitigation of drought stress in broccoli plants subjected to water deficit at 25% of field capacity. The results showed that the broccoli plants grown under drought stress alone exhibited severe disturbance in growth with considerable reductions in the shoot length, and fresh and dry weights, leaf area, relative water content, leaf water potential, and photosynthetic pigment contents and elevated levels of the lipid peroxidation product malondialdehyde in the leaves. Additionally, the foliar application of microalgae mitigated the detrimental effects of drought, leading to better growth performance (increase of 9%-132%) when compared with the drought-stressed plants that had not received an application...

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