Alleviating Role of Gibberellic Acid in Enhancing Plant Growth and Stimulating Phenolic Compounds in Carrot (Daucus carota L.) under Lead Stress

Toxicity of heavy-metals in soil is a major constraint for the production carrots (Daucus carota L.). Different plant growth regulators are being used to overcome this problem. It has been found that induce stress tolerance plants. In study, role exogenously applied regulator, gibberellic acid (GA3) was examined grown two carrot cultivars under four different levels lead (0, 50, 100, and 150 mg/kg) with one level (50 ppm). Results showed Pb retarded reduced chlorophyll contents leaves both cultivars. A significant decrease observed photosynthetic attributes by addition alone. However, GA3 ameliorated stressed conditions. Moreover, also decreased uptake concentration roots. addition, significantly regulated phenolic compounds stress. cultivar T-29 be more tolerant stress, however, Mevarick experienced higher damage regarding