Effects of cadmium, chromium and lead on growth, metal uptake and antioxidative capacity in Typha angustifolia.
This study investigates the modulation of antioxidant defence system of Typha angustifolia after 30 days exposure of 1 mM chromium (Cr), cadmium (Cd), or lead (Pb). T. angustifolia showed high tolerance to heavy metal toxicity with no visual toxic symptom when exposed to metal stress, and Cd/Pb addition also increased plant height and biomass especially in Pb treatment. Along with increased Cr, Cd, and Pb uptake in metal treatments, there was enhanced uptake of plant nutrients including Ca and Fe, and Zn in Pb treatment. A significant increase in malondialdehyde (MDA) content and superoxide dismutase (SOD) and peroxidase (POD) activities were recorded in plants subjected to Cr, Cd, or Pb stress. Furthermore, Pb stress also improved catalase (CAT), ascorbate peroxidase (APX), and glutathione peroxidase (GPX) activities; whereas Cr stress depressed APX and GPX. The results indicate that enzymatic antioxidants and Ca/Fe uptake were important for heavy metal detoxification in T. angustifolia, stimulated antioxidative enzymes, and Ca, Fe, and Zn uptake could partially explain its hyper-Pb tolerance.
Bah
Alieu Mohamed
AM
Department of Agronomy, College of Agriculture and Biotechnology, Huajiachi Campus, Zhejiang University, Hangzhou, People's Republic of China.
Dai
Huaxin
H
Zhao
Jing
J
Sun
Hongyan
H
Cao
Fangbin
F
Zhang
Guoping
G
Wu
Feibo
F
D000975:Antioxidants / Q000378:metabolism*; D060387:Ascorbate Peroxidases; D002104:Cadmium / Q000378:metabolism / Q000494:pharmacology*; D002857:Chromium / Q000378:metabolism / Q000494:pharmacology*; D005979:Glutathione Peroxidase / Q000378:metabolism; D007501:Iron / Q000378:metabolism; D007854:Lead / Q000378:metabolism / Q000494:pharmacology*; D015227:Lipid Peroxidation; D008315:Malondialdehyde / Q000378:metabolism; D010544:Peroxidases / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism* / Q000502:physiology; D013312:Stress, Physiological; D013482:Superoxide Dismutase / Q000378:metabolism; D014131:Trace Elements / Q000378:metabolism / Q000494:pharmacology; D032401:Typhaceae / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*
D000975:Antioxidants; D014131:Trace Elements; D002104:Cadmium; D002857:Chromium; D007854:Lead; D008315:Malondialdehyde; D007501:Iron; D010544:Peroxidases; D060387:Ascorbate Peroxidases; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase