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- W3193090495 abstract "The residues of bensulfuron-methyl (BSM), a sulfonylurea herbicide, in soil have caused serious damage to the rotation of susceptible crops. Many studies have reported that the removal of BSM in soil was achieved by adding degrading bacteria. However, the mechanisms used by bacteria to degrade BSM in the crop rhizosphere remain unclear. In this study, a BSM-degrading bacterium, Hansschlegelia zhihuaiae S113, was applied to investigate the enhancement of effects mediated by organic acids during the bioremediation of BSM-contaminated maize rhizosphere soil. Organic acids, such as L-malic acid, tartaric acid, and fumaric acid, identified in maize root exudates, significantly stimulated the expression of cheA, which encoded the histidine kinase in strain S113 and contributed to the chemotactic response. This process accelerated the accumulation of strain S113 around the maize roots and promoted the colonization process on maize roots. The growth of strain S113 was significantly increased by L-malic acid but not tartaric acid or fumaric acid. After the S113 suspension was root-irrigated to BSM-contaminated soil, the density of strain S113 colonizing root surfaces and in rhizosphere soil reached 1.1 × 104 cells/g for roots and 4.9 × 104 cells/g in dry soil at 15 d, leading to 80.9% BSM degradation efficiency. The treatment with the addition of a mixture of S113 and L-malic acid completely degraded BSM in rhizosphere soil due to the strong attraction and growth promotion of strain S113 by L-malic acid, with a higher efficiency than that with the extra addition of fumaric acid (89.7%) or tartaric acid (87.0%). This paper revealed the enhancement effects of organic acids identified in root exudates for the in situ bioremediation of BSM-contaminated rhizosphere soil." @default.
- W3193090495 created "2021-08-16" @default.
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- W3193090495 date "2021-10-01" @default.
- W3193090495 modified "2023-09-24" @default.
- W3193090495 title "The enhanced mechanisms of Hansschlegelia zhihuaiae S113 degrading bensulfuron-methyl in maize rhizosphere by three organic acids in root exudates" @default.
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- W3193090495 doi "https://doi.org/10.1016/j.ecoenv.2021.112622" @default.
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