Article

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: 0.62). 01/2007; 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.

0 Bookmarks
 · 
106 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: Excess of rare earth elements in soil can be a serious environmental stress on plants, in particular when acid rain coexists. To understand how such a stress affects plants, we studied antioxidant response of soybean leaves and roots exposed to lanthanum (0.06, 0.18, and 0.85 mmol L(-1)) under acid rain conditions (pH 4.5 and 3.0). We found that low concentration of La(3+) (0.06 mmol L(-1)) did not affect the activity of antioxidant enzymes (catalase and peroxidase) whereas high concentration of La(3+) (≥0.18 mmol L(-1)) did. Compared to treatment with acid rain (pH 4.5 and pH 3.0) or La(3+) alone, joint stress of La(3+) and acid rain affected more severely the activity of catalase and peroxidase, and induced more H2O2 accumulation and lipid peroxidation. When treated with high level of La(3+) (0.85 mmol L(-1)) alone or with acid rain (pH 4.5 and 3.0), roots were more affected than leaves regarding the inhibition of antioxidant enzymes, physiological function, and growth. The severity of oxidative damage and inhibition of growth caused by the joint stress associated positively with La(3+) concentration and soil acidity. These results will help us understand plant response to joint stress, recognize the adverse environmental impact of rare earth elements in acidic soil, and develop measures to eliminate damage caused by such joint stress.
    Environmental Science and Pollution Research 05/2013; · 2.62 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The aims of the present study are to investigate the effects of Ce(3+) on the growth and some antioxidant metabolisms in rice seedlings (Oryza sativa L. cv Shengdao 16). The rice was treated with 0, 0.05, 0.1, 0.5, 1.0, and 1.5 mM Ce(3+), respectively. The growth index of rice was measured. The chlorophyll content; catalase, superoxide dismutase, and peroxidase activities; and the level of hydrogen peroxide (H(2)O(2)), superoxide anion (O (2) (·-) ), and malondialdehyde were assayed. The accumulation of Ce(3+) and the uptake of mineral nutrition elements were analyzed with ICP-SF-MS. Hormetic effects of Ce(3+) on the growth and some antioxidant metabolisms were found in the roots and shoots of rice. The roots can accumulate a much higher content of Ce(3+) than shoots and Ce(3+) mainly located in the cell wall of roots. Moreover, the uptake of K, Mg, Ca, Na, Fe, Mn, Zn, Cu, and Mo in the roots and shoots was affected with the exposure of different Ce(3+) treatments, which indicated that Ce(3+) affected the nutritional status of roots and shoots and further affected the growth of rice. The appropriate amount of Ce(3+) improved the defense system and growth of rice. The roots can accumulate a much higher content of Ce(3+) than shoots. Moreover, the uptake of K, Mg, Ca, Na, Fe, Mn, Zn, Cu, and Mo in the roots and shoots was affected with the exposure of different Ce(3+) treatments.
    Environmental Science and Pollution Research 03/2012; 19(8):3282-91. · 2.62 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Increasing amounts of lanthanum (La) is released into aquatic environments. However, little information is available on the influence of La on aquatic plants. In this study, physiological and ultrastructural responses of Hydrocharis dubia (Bl.) Backer leaves to elevated concentrations of La (up to 160 μM) were investigated. The accumulation of La was found to be increased in a concentration-dependent manner. La disturbed the intrinsic balance of nutrient elements (P, Mg, Ca, Fe, K, and Zn). Pigment content decreased with the rise of the La concentrations and the EC(50) value for chlorophyll was 20 μM on day 7. The antioxidants (superoxide dismutase, peroxidase, catalase, reduced ascorbate, and reduced glutathione) exhibited varied response to the La treatments. Malondialdehyde content enhanced gradually at all La concentrations. The enhancement in proline content was found in a concentration-dependent manner. The amounts of three polypeptides with apparent molecular weights of 61.9, 51.5, and 16.7 kDa, respectively, were gradually diminished, as well as one existing polypeptides with apparent molecular weight of 22.3 kDa, elevating in response to increasing La concentrations. Significant damage to the chloroplast, mitochondrion, and nucleus was imposed by La indicated a general disarray in the cellular functions. The negative effects of La on H. dubia unequivocally indicate that La could exert an adverse influence on aquatic ecosystem and should lead to a more careful discharge of such elements into water environment.
    Environmental Science and Pollution Research 05/2012; 19(9):3950-8. · 2.62 Impact Factor