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Degradation of bisphenol A by the epiphytic bacteria of submerged macrophytes Hydrilla verticillata (L.f.) Royle |
ZHANG Guo-sen, WANG Yu, ZHUANG Xiao-jin, YANG Shao, JIANG Jin-hui |
School of Life Sciences, Central China Normal University, Wuhan 430079, China |
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Abstract Epiphytic bacteria of submerged macrophytes may have the capability in biodegradation and/or biotransformation of bisphenol A (BPA) in water column, therefore affect the fate of such environmental pollutant. In this research, Hydrilla verticillata (L. f.) Royle was selected and their attached BPA degrading epiphytic bacteria attached were isolated. Among the 22bacteria strains, the BPA removal rates were from 11.46% to 25.06% with the inoculum density at 1×10-8cell/mL and culture at 37℃ for 72h. The most effective bacteria strains, B12, B14and B23 were identified as Lysinibacillus sp., Brevibacterium sp. and Ochrobactrum sp., respectively, according to the results of 16S rDNA sequencing and morphological, physiological and biochemical tests. But aseptic seedlings of H. verticillata significantly decreased their BPA removal rates after the addition with B12, B14and B23 (P<0.05). Natural seedlings of such species surprisingly increased about 5% in BPA removal after partially removing their epiphyte with physical methods. All the results indicated that epiphytic bacteria of submerged plant can remove BPA, although their contributions (about 23%) are less than the host plants in the submerged macrophytes-epiphyte associations.
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Received: 30 January 2016
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