Lanthanum- and cerium-induced oxidative stress in submerged Hydrilla verticillata plants
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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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.Journal of soil science and plant nutrition. 12/2011; 12(1):1-14.
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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; · 2.76 Impact Factor
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ABSTRACT: Aims The aim of this work was to investigate the effects of rare earth elements lanthanum (La3+) and gadolinium (Gd3+) on root system architecture and interactions with low phosphate signaling in Arabidopsis thaliana. Methods Detailed analysis of root system architecture was performed in Arabidopsis WT seedlings and in low phosphorus insensitive mutants lpi1-3 and lpr1-1 lpr2-1 in response to REEs. Expression studies of P-deficiency regulated phosphate transporters AtPT1, AtPT2 and AtMGD2 were also conducted. The role of auxin as a mediator of root morphogenetic changes by Gd3+ was evaluated by using the auxin-inducible marker gene DR5:uidA and auxin-signaling mutants tir1, tir1 afb2 afb3, arf7, arf19 and arf7 arf19. Results We found that increasing concentrations of REEs inhibited primary root growth and increased root hair and lateral root development in WT seedlings. These effects were reduced in low phosphorus insensitive mutants lpi1-3 and lpr1-1 lpr2-1. Gd3+ activated the expression of AtPT1, AtPT2 and AtMGD2 markers. Lateral root formation by Gd3+ decreased in tir1 afb2 afb3 and arf7 arf19 mutants. Conclusions Our results suggest that REEs affect RSA in Arabidopsis by inducing low-P adaptive responses by creating P deficiency conditions in the growth medium by precipitating phosphate.Plant and Soil 01/2012; 353(1-2):231-247. · 3.24 Impact Factor