Phytoremediation of heavy metals by Alternanthera bettzickiana: Growth and physiological response

作者：Tauqeer Hafiz Muhammad; Ali Shafaqat; Rizwan Muhammad; Ali Qasim; Saeed Rashid; Iftikhar Usman; Ahmad Rehan; Farid Mujahid; Abbasi Ghulam Hassan

来源：Ecotoxicology and Environmental Safety, 2016, 126: 138-146.

DOI：10.1016/j.ecoenv.2015.12.031

• Antioxidants
• Heavy metal
• Oxidative stress
• Phytoremediation
• Tolerance

The present study was aimed to evaluate the morphological, physiological and biochemical responses of Alternanthera Bettzickiana (Regel) G. Nicholson plant subjected to different levels of cadmium (Cd) and lead (Pb) (0, 0.5, 1.0 and 2.0 mM) stress. A. bettzickiana was able to accumulate Cd and Pb in different plant parts and total uptake of both metals was higher in shoots than roots. Plant growth, biomass and photosynthetic pigments increased with increasing metal concentrations, up to 1.0 mM, in soil and then decreased with higher metal levels. The activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX) increased under lower metal levels (0.5 and 1.0 mM) while decreased at higher metal levels (2.0 mM). Leaf and root electrolyte leakage (EL), malondialdehyde (MDA) and hydrogen peroxide (H2O2) contents decreased at lower metal levels (<= 1.0 mM) while increased at higher levels. The present study clearly signifies the potential of A. bettzickiana plant towards Cd and Pb tolerance and accumulation especially at lower metal levels.

• 出版日期2016-4