Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/68024
標題: Expression of mercuric reductase from Bacillus megaterium MB1 in eukaryotic microalga Chlorella sp DT: an approach for mercury phytoremediation
作者: Huang, C.C.
Chen, M.W.
Hsieh, J.L.
Lin, W.H.
Chen, P.C.
Chien, L.F.
關鍵字: bacterial mera gene
transgenic microalgae
rice transformation
growth-hormone
heavy-metals
ellipsoidea
resistance
stress
plants
japan
期刊/報告no:: Applied Microbiology and Biotechnology, Volume 72, Issue 1, Page(s) 197-205.
摘要: A eukaryotic microalga, Chlorella sp. DT, was transformed with the Bacillus megaterium strain MB1 merA gene, encoding mercuric reductase (MerA), which mediates the reduction of Hg2+ to volatile elemental Hg-0. The transformed Chlorella cells were selected first by hygromycin B and then by HgCl2. The existence of merA gene in the genomic DNA of transgenic strains was shown by polymerase chain reaction amplification, while the stable integration of merA into genomic DNA of transgenic strains was confirmed by Southern blot analysis. The ability to remove Hg2+ in merA transgenic strains was higher than that in the wild type. The merA transgenic strains showed higher growth rate and photosynthetic activity than the wild type did in the presence of a toxic concentration of Hg2+. Cultured with Hg2+, the expression level of superoxide dismutase in transgenic strains was lower than that in the wild type, suggesting that the transgenic strains faced a lower level of oxidative stress. All the results indicated that merA gene was successfully integrated into the genome of transgenic strains and functionally expressed to promote the removal of Hg2+.
URI: http://hdl.handle.net/11455/68024
ISSN: 0175-7598
文章連結: http://dx.doi.org/10.1007/s00253-005-0250-0
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