Lanthanum- and cerium-induced oxidative stress in submerged Hydrilla verticillata plants

Shandong University of Technology College of Life Science Zibo 255049 China
Russian Journal of Plant Physiology (Impact Factor: 0.95). 09/2007; 54(5):693-697. DOI: 10.1134/S1021443707050184


Oxidative stress was induced in 10-day treated with lanthanum and cerium Hydrilla verticillata plants. Low 10 μM concentrations did not exert harmful effects. The plants treated with higher concentrations showed higher
H2O2 content and lower chlorophyll and soluble protein contents as compared to control plants. At the same time, malondialdehyde
content rose with increasing concentrations of La and Ce. As La and Ce concentrations increased, superoxide dismutase and
catalase activities declined progressively, while peroxidase activity increased. Proline content decreased slightly at 10
μM La or Ce and then rose with higher concentrations. The results indicated that La and Ce caused oxidative damage as evidenced
by increased lipid peroxidation and decreased chlorophyll and protein levels.

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    • "The lipid peroxidation caused by La probably directly affected the membranes of organelles. Wang et al. (2007) found that La induced oxidative stress by decreasing the activities of antioxidant enzymes such as superoxide dismutase and catalase as well as by stimulating the production of reactive oxygen species, resulting in lipid peroxidation in Hydrilla verticillata. "
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    ABSTRACT: Rare earth elements such as lanthanum (La) have been used as agricultural inputs in some countries in order to enhance yield and improve crop quality. However, little is known about the effect of La on the growth and structure of soybean, which is an important food and feed crop worldwide. In this study, bioaccumulation of La and its effects on the growth and mitotic index of soybean was evaluated. Soybean plants were exposed to increasing concentrations of La (0, 5, 10, 20, 40, 80, and 160µM) in nutrient solution for 28 days. Plant response to La was evaluated in terms of plant growth, nutritional characteristics, photosynthetic rate, chlorophyll content, mitotic index, modifications in the ultrastructure of roots and leaves, and La mapping in root and shoot tissues. The results showed that the roots of soybean plants can accumulate sixty-fold more La than shoots. La deposition occurred mainly in cell walls and in crystals dispersed in the root cortex and in the mesophyll. When La was applied, it resulted in increased contents of some essential nutrients (i.e., Ca, P, K, and Mn), while Cu and Fe levels decreased. Moreover, low La concentrations stimulated the photosynthetic rate and total chlorophyll content and lead to a higher incidence of binucleate cells, resulting in a slight increase in roots and shoot biomass. At higher La levels, soybean growth was reduced. This was caused by ultrastructural modifications in the cell wall, thylakoids and chloroplasts, and the appearance of c-metaphases. Copyright © 2015 Elsevier Inc. All rights reserved.
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    • "5 mg kg 21 . The agricultural supplies originating from phosphate rocks ( thermophosphate and single superphosphate ) presented values within this range ; however , the values for La and Ce were relatively high considering normal values found in soils . There is no consensus about the use of REEs as nutrients for plants ; however , both negative ( Wang et al . 2007 ) and positive ( Hu et al . 2004 ) effects have been reported ."
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    ABSTRACT: The current study aimed to determine the chemical composition of agricultural supplies used in organic fruticulture in Brazil to identify potential risks from chemical contamination and to provide information for traceability. The nutrient found in highest concentrations was Ca. Some agricultural supplies presented K, Co, Fe and Zn at levels comparable to fertilizers used in conventional agriculture. In general, the evaluated agricultural supplies were adequate for use in organic fruticulture, with a few exceptions of chemical elements presenting concentrations close to the maximum limits set by legislation.
    Full-text · Article · Sep 2013 · Biological Agriculture and Horticulture
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    • "Toxic levels of La and Ce (30-100 µM) increased the free proline level of Hydrilla verticillata (Wang et al., 2007). REEs are also supposed to be involved in increasing the water use efficiency of plants by increasing their proline content. "
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    ABSTRACT: A pot culture experiment was conducted to study the effect of various concentrations of cerium provided as cerium nitrate (0.713, 3.568, 17.841, 89.206 and 446.030 μM) on the growth performance, dry matter production, biochemical constituents and enzymatic activity of cowpea plants [Vigna unguiculata (L.) Walp.]. Low concentrations of cerium were observed to be beneficial for the test plants. A positive correlation was observed between a lower level of cerium (0.713-17.841 μM) and foliar chlorophyll content, relative yield (dry matter) and nitrate reductase activity. Higher levels of cerium (89.206-446.030 μM) significantly increased the proline content and polyphenol oxidase activity of the test plants. Root growth was more adversely affected than shoot growth.
    Preview · Article · Dec 2011
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