期刊
CHEMOSPHERE
卷 89, 期 6, 页码 743-750出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.07.005
关键词
Endophytic bacterium; Phytoremediation; Cadmium; Antioxidant enzymes; Phytotoxicity
资金
- National Science Fund for Distinguished Young Scholars [50725825]
- National Natural Science Foundation of China [50830301]
- Key Special Science & Technology Project for Energy Saving and Emission Reduction of Hunan Province [2008SK1002]
The aim of this work was to evaluate effects of endophytic bacterium inoculation on plant growth and assess the possible mechanism of endophyte in heavy metal phytoremediation. Seeds of Solanum nigrum L were inoculated with endophyte Serratia nematodiphila LRE07 and were subjected to Cd in the growing medium. Cd produced a significant inhibition on plant growth and a reduction in the content of photosynthetic pigments. The inoculation of endophytic bacterium alleviated the Cd-induced changes, resulting in more biomass production and higher photosynthetic pigments content cif leaves compared with non-symbiotic ones. The beneficial effect was more obvious at relatively low Cd concentration (10 mu M). Based on the alteration of nutrient uptake and activated oxygen metabolism in infected plants, the possible mechanisms of endophytic bacterium in Cd phytotoxicity reduction can be concluded as uptake enhancement of essential mineral nutrition and improvement in the antioxidative enzymes activities in infected plant. (C) 2012 Elsevier Ltd. All rights reserved.
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