title: Hexavalent chromium uptake and its effects on mineral uptake, antioxidant defence system and photosynthesis in Amaranthus viridis L.
abstract: The effects of different concentrations (10(-6)M, 10(-5)M and 10(-4)M) of K2Cr2O7Cr(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 CO2 concentration were reduced only by high Cr(VI) treatments (10(-5)M and 10(-4)M). The chlorophyll fluorescence parameters Fv/Fm, Fv(')/Fm('), Phi PSII and qP, decreased in Cr(VI)-treated, but qN and NPQ showed an increase in Cr(VI) treated plants.
authors.affiliation: Department of Biology, College of Chemistry and Life Sciences, Tianjin Normal University, Tianjin 300387, PR China. donghua@mail.zlnet.com.cn <donghua@mail.zlnet.com.cn>
authors.forename: Donghua
authors.initials: D
authors.lastname: Liu
authors.forename: Jinhua
authors.initials: J
authors.lastname: Zou
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.forename: Wusheng
authors.initials: W
authors.lastname: Jiang
mesh_terms: D027721:Amaranthus / Q000378:metabolism*; D000975:Antioxidants / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism; D002857:Chromium / Q000378:metabolism*; D005453:Fluorescence; D008315:Malondialdehyde / Q000378:metabolism; D008903:Minerals / Q000378:metabolism*; D010788:Photosynthesis
chemical_list: D000975:Antioxidants; D008903:Minerals; D002857:Chromium; D002734:Chlorophyll; D008315:Malondialdehyde