PJB-2018-983
EFFECT OF ARSENIC ON GROWTH AND ANTIOXIDANT DEFENSE SYSTEM IN A VERSATILE HERB, CORIANDER
Faheema Khan
Abstract
A hydroponic experiment was conducted to investigate the toxicity caused by Arsenate (As V) and its detoxification responses in coriander. Ten-day-old seedlings of coriander were treated with 0, 25, 50, 75, and 100 µM (Na2HAsO4) sodium arsenate for seven days and analysed for growth, lipid peroxidation, proline content and antioxidant enzyme activities. A significant decrease (24-71%) in shoot length and (31-92%) root length along with plant biomass (38-88%) was observed in coriander with increase in As (V) levels over control. As (V) induced oxidative stress resulted in increased proline content and decreased in malondialdehyde (MDA) content in a dose dependant manner as compare to control. Antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) showed increased activity 86%, 59%, 63% and 74% with increase in As (V) concentration. Results indicate the lower MDA content and enhanced activities of antioxidant enzymes play a significant role in As (V) detoxification in coriander.
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