Open AccessImpairment of cellulose‐ and cellobiose‐degrading soil B acteria by two acidic herbicides
Author(s) -
Schellenberger Stefanie,
Drake Harold L.,
Kolb Steffen
Publication year - 2012
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2011.02460.x
Subject(s) - cellobiose , bacteria , cellulose , anaerobic bacteria , chemistry , microcosm , microorganism , biology , environmental chemistry , microbiology and biotechnology , food science , biochemistry , cellulase , genetics
Herbicides have the potential to impair the metabolism of soil microorganisms. The current study addressed the toxic effect of bentazon and 4‐chloro‐2‐methylphenoxyacetic acid on aerobic and anaerobic B acteria that are involved in cellulose and cellobiose degradation in an agricultural soil. Aerobic saccharide degradation was reduced at concentrations of herbicides above environmental values. Microbial processes (e.g. fermentations, ferric iron reduction) that were linked to anaerobic cellulose and cellobiose degradation were reduced in the presence of both herbicides at concentrations above and at those that occur in crop field soil. 16 S rRNA gene transcript numbers of total B acteria , and selected bacterial taxa ( C lostridia [ G roup I], P lanctomycetaceae , and two uncultivated taxa of B acteroidetes ) decreased more in anoxic than in oxic cellulose‐supplemented soil microcosms in the presence of both herbicides. Collectively, the results suggested that the metabolism of anaerobic cellulose‐degrading B acteria was impaired by typical in situ herbicide concentrations, whereas in situ concentrations did not impair metabolism of aerobic cellulose‐ and cellobiose‐degrading soil B acteria .