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Bulletin of Botanical Research ›› 2018, Vol. 38 ›› Issue (5): 675-681.doi: 10.7525/j.issn.1673-5102.2018.05.006

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Influence of Rare Earth Elements on Physiological and Biochemical Characteristics of Didymodon tectorum

GAO Ye-Qing, REN Dong-Mei   

  1. College of Life Science, Inner Mongolia University and Key Laboratory of Forage and Endemic Crop Biotechnology, Ministry of Education, School of Life Sciences, Inner Mongolia University, Hohhot 010070
  • Received:2018-04-10 Online:2018-09-15 Published:2018-08-31
  • Supported by:
    National Natural Science Foundation of China(31360142,31260046);High Level Talent Introduction Project of Inner Mongolia University

Abstract: Based on the successful application of tissue cultured seedlings of Didymodon tectorum, three physiological indexes, including POD vitality, MDA and chlorophyll content were determined to check out the influences of the rare earth elements stress under gradient concentrations treatment. We choosed the light rare earth La3+, Ce4+ and heavy rare earth Y3+ three elements and setted respectively six concentrations under the single elemnet stress, in order to explore the physiological response and changes of D.tectorum to the rare earth stress. The results were the following:(1)The peroxidase(POD) activity and malondialdehyde(MDA) content in D.tectorum were lower in each treatment group than those in the control group; Ce4+ element significantly promoted the POD activity at 3.55×10-2 mmol·L-1, at 7.1×10-2 mmol·L-1, the content of MDA increased. It showed that the D.tectorum had a stronger response to Ce4+ stress, while La3+ showed a more gradual change in POD activity, and the stress response was weaker; Y3+ treatment was intermediate; (2)At lower concentrations of La3+(1.8×10-2 mmol·L-1) and Ce4+(3.55×10-2 mmol·L-1) the contents of chlorophyll a, chlorophyll b and total chlorophyll increased significantly, but at higher concentrations of all three rare earth elements, the contents of chlorophyll decreased obviousily. This study laid the foundation for further exploration of the effects of rare earth elements on the growth and the development of bryophytes in the Baiyun obo rare earth mineral area.

Key words: Didymodon tectorum, rare earth elements, enzyme activity, malondialdehyde, chlorophyll

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