Hexavalent chromium uptake and its effects on mineral uptake, antioxidant defence system and photosynthesis in Amaranthus viridis L

• Published in: Bioresource technology Vol. 99; no. 7; pp. 2628 - 2636
• Main Authors: Liu, Donghua, Zou, Jinhua, Wang, Min, Jiang, Wusheng
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2008; [New York, NY]: Elsevier Ltd; Elsevier Science
• Subjects: Amaranthus - metabolism; Amaranthus viridis; Amaranthus viridis L; Antioxidant enzymes; Antioxidants - metabolism; Biological and medical sciences; Chlorophyll - metabolism; Chlorophyll fluorescence; Chromium; Chromium - metabolism; Fluorescence; Fundamental and applied biological sciences. Psychology; Lipid peroxidation; Malondialdehyde - metabolism; Minerals - metabolism; Photosynthesis; q P; POD; ΦPSII; Antioxidant enzymes; Lipid peroxidation; SOD; MDA; F v′/ F m; NPQ; QA; Amaranthus viridis L; Chlorophyll fluorescence; QB; F m; CAT; F 0; F s; Chromium; F v; F v/ F m; q N; Chlorophyll; Enzyme; Fluorescence; Lipids; Amaranthaceae; Antioxidant; Absorption; Vegetable crop; Dicotyledones; Angiospermae; Spermatophyta; Photosynthesis; Chromium VI; Peroxidation
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2007.04.045

The effects of different concentrations (10 −6 M, 10 −5 M and 10 −4 M) of K 2Cr 2O 7Cr(VI) on some minerals (Mn, Fe, Cu and Zn), lipid peroxidation, activities of antioxidant enzymes, photosynthetic function, and chlorophyll fluorescence characteristics were investigated in hydroponically grown Amaranthus viridis L. Results indicated that chromium was accumulated primarily in roots. In the roots and shoots, the Cr content increased with the increasing Cr(VI) concentrations, and induced decrease of Mn, Fe, Cu and Zn. Chromium Cr(VI) induced oxidation stress and lipid peroxidation in A. viridis L. shown by the increased concentration of MDA. The increased activities of POD and SOD indicated that they could serve as important components of antioxidant defense mechanisms to minimize Cr induced oxidative injury. The net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO 2 concentration were reduced only by high Cr(VI) treatments (10 −5 M and 10 −4 M). The chlorophyll fluorescence parameters F v/ F m, F v ′ / F m ′ , ΦPSII and q P, decreased in Cr(VI)-treated, but q N and NPQ showed an increase in Cr(VI) treated plants.