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- W4220809570 abstract "The biodegradation of polycyclic aromatic hydrocarbons in soil is enhanced by chemical constituents of various plant species that support the growth and activity of PAH degrading bacteria in the rhizosphere. Here, we investigated the phytochemical effects of celeriac (Apium graveolens var. rapaceum) root tissues, a known stimulator of PAH degradation, on the copy numbers of nahAc, xylE, and 16S rRNA genes to determine the relative contributions of growth-linked degradation versus selective enrichment of PAH degraders. Real-time quantitative PCR analysis showed that the copy numbers of 16S rRNA genes, as a reporter of general bacterial population size, increased approximately 2- to 5-fold in soil amended with celeriac, but were not affected by exposure to naphthalene alone. In contrast, copy numbers of two functional genes (nahAc and xylE), commonly used as reporters for monitoring the population size of PAH degraders, were significantly increased following exposure to naphthalene but were differently affected by soil amendment with celeriac. As compared with the copy numbers of nahAc gene in unamended control soil, the nahAc copy numbers were increased by 460-fold in soil amended with naphthalene alone and by 610-fold in soil amended with both naphthalene and celeriac after 10 days of incubation. The copy numbers of xylE were increased by 20-fold in soil amended with naphthalene alone and increased by 200-fold in soil amended with both naphthalene and celeriac after 10 days of incubation. The result suggests that increased degradation rates of PAHs in the presence of celeriac involves both growth linked processes and selective enrichment of the degrader population." @default.
- W4220809570 created "2022-04-03" @default.
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- W4220809570 date "2022-03-11" @default.
- W4220809570 modified "2023-10-16" @default.
- W4220809570 title "Phytochemical effects of <i>Apium graveolens</i> on the abundances of functional genes associated with PAH degradation in soil" @default.
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- W4220809570 doi "https://doi.org/10.1080/10889868.2022.2049680" @default.
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