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Abstract
Heavy metal pollution is the main environmental concern that effects plant growth, and physiological and biochemical processes which are vital for plant development. Medicinal plants are more susceptible to environmental factors such as salt, drought and heavy metals. To explore the role of SA and EDTA under heavy metal stress an RCBD experiment was conducted at Botanical Garden University of Balochistan, Quetta. The Experiment was RCBD. The seed of the plant is sown, and after 15 days of germination heavy metal is applied (Zinc and Cobalt). After Two weeks of heavy metal application, the plant signalling molecules were applied as a foliar spray (SA and EDTA). Later 15 days foliar application plants were harvested for growth and photosynthetic parameters. Results showed that heavy metals affect plant growth and developmental parameters, however foliar spray of SA and EDTA positively improved plant growth and physiological attributes under heavy metal stress. It is suggested that plant signalling molecules play a vital role under stress and can be used in future to improve the medicinal value of plants under various stress conditions.
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