Liu Donghua, Zou Jinhua, Wang Min, Jiang Wusheng
Department of Biology, College of Chemistry and Life Sciences, Tianjin Normal University, Tianjin 300387, PR China.
Bioresour Technol. 2008 May;99(7):2628-36. doi: 10.1016/j.biortech.2007.04.045. Epub 2007 Jun 13.
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.
研究了不同浓度（10⁻⁶M、10⁻⁵M和10⁻⁴M）的重铬酸钾Cr(VI)对水培苋菜中某些矿物质（锰、铁、铜和锌）、脂质过氧化、抗氧化酶活性、光合功能及叶绿素荧光特性的影响。结果表明，铬主要积累在根部。在根和地上部分，铬含量随Cr(VI)浓度的增加而增加，并导致锰、铁、铜和锌含量降低。Cr(VI)诱导了苋菜的氧化应激和脂质过氧化，表现为丙二醛浓度升高。过氧化物酶（POD）和超氧化物歧化酶（SOD）活性增加表明，它们可作为抗氧化防御机制的重要组成部分，以最小化Cr诱导的氧化损伤。仅高浓度Cr(VI)处理（10⁻⁵M和10⁻⁴M）降低了净光合速率、蒸腾速率、气孔导度和胞间二氧化碳浓度。在Cr(VI)处理的植株中，叶绿素荧光参数Fv/Fm、Fv'/Fm'、光系统II实际光化学效率（Phi PSII）和光化学淬灭系数（qP）降低，但非光化学淬灭系数（qN）和光化学猝灭系数（NPQ）升高。
