Department of Environmental Sciences, University of Gujrat, Hafiz Hayat Campus, Jalapur Jattan Road, Gujrat, Pakistan.
Department of Environmental Sciences and Engineering, Government College University, Allama Iqbal Road, 38000 Faisalabad, Pakistan.
Ecotoxicol Environ Saf. 2016 Apr;126:138-146. doi: 10.1016/j.ecoenv.2015.12.031. Epub 2015 Dec 31.
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.
本研究旨在评估Alternanthera Bettzickiana（Regel）G. Nicholson 植物在不同水平的镉（Cd）和铅（Pb）（0、0.5、1.0 和 2.0 mM）胁迫下的形态、生理和生化反应。A. bettzickiana 能够在不同的植物部位积累 Cd 和 Pb，并且两种金属的总吸收量在地上部分高于根部。在土壤中，随着金属浓度的增加（0.5 和 1.0 mM），植物生长、生物量和光合色素增加，然后随着金属水平的升高而降低。在较低的金属水平（0.5 和 1.0 mM）下，超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）的活性增加，而在较高的金属水平（2.0 mM）下则降低。叶片和根电解质渗漏（EL）、丙二醛（MDA）和过氧化氢（H2O2）含量在较低的金属水平（≤1.0 mM）下降低，而在较高的水平下则增加。本研究清楚地表明，A. bettzickiana 植物对 Cd 和 Pb 的耐受性和积累能力很强，特别是在较低的金属水平下。
