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: 0.76). 09/2007; 54(5):693-697. DOI: 10.1134/S1021443707050184

ABSTRACT 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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    • "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.
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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.
    12/2011; 12(1):1-14. DOI:10.4067/S0718-95162012000100001
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    • "This enhancement was significant at p = 0.05 level of significance. Wang et al. (2007) reported an increment in POD activity at 30 µM REEs level and indicated that POD play a decisive role in eliminating poisonous H 2 O 2 in H. verticillata under imposed stress. Under stressed condition the increase in the amount of phenols is accompanied by an enhancement in the peroxidase activity (Figure 4) causing the destruction of auxins (Stenlid, 1976). "
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    ABSTRACT: The effect of various concentrations (0.1, 0.5, 2.5, 12.5 and 62.5 µg g -1) of Lanthanum as Lanthanum nitrate added to soil was studied on the content of foliar chlorophyll (Chl. 'a', Chl. 'b', Total chl.), soluble leaf protein, total phenol contents and peroxidase activity of cowpea [Vigna unguiculata (L.) Walp.]. Lower applications (0.1 to 2.5 µg g -1) of La resulted in enhancement in foliar chlorophyll contents (Chl. 'a', Chl. 'b', total chl.) and a decrement in soluble leaf protein and total phenol contents. A significant (at p=0.05 level of significance) increase in the activity of peroxidase enzyme at higher concentrations (12.5 to 62.5 µg g -1) of lanthanum was observed.
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