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- W2117514152 abstract "Abstract Possible side‐effects of the acetolactate synthase (ALS)‐inhibiting herbicide chlorimuron‐ethyl on Bradyrhizobium japonicum (Kirchner & Jordan) in pure culture and on inoculated soybean plants growing under controlled conditions were investigated. Growth of B japonicum strain E109 was not affected by this herbicide even when exposed to concentrations 150 times higher than recommended field doses. However, nodulation of soybean plants treated 5 days after emergence with chlorimuron‐ethyl at standard application rates was impaired: a 38% decrease in the number of nodules per plant was observed four weeks after treatment. Despite nodule number decrease, no changes in shoot nitrogen content could be detected. Total fresh biomass was diminished by 25% in herbicide‐treated plants. Leghemoglobin content in nodules did not vary; nevertheless total nodule protein was diminished by 40% in the herbicide‐treated group. ALS activity in different soybean tissues and their relative sensitivity to chlorimuron‐ethyl were also investigated. Roots and bacteroids had the greatest specific ALS activities. On a fresh weight basis, the bacteroid fraction displayed the highest ALS activity and was also the most tolerant to in vitro chlorimuron addition: 72% of its activity was retained after including 10 µ M chlorimuron‐ethyl in the reaction mixture. These results indicate that standard application rates of chlorimuron‐ethyl will have limited incidence on B japonicum survival, and effects on nodulation may have little long‐term consequences on soybean nitrogen fixation potential. The differences found among soybean tissues not only in intrinsic ALS activity but also in their relative sensitivity to this herbicide suggests that, in leguminous plants living in symbiosis with rhizobia, nodules may contribute to an enhanced tolerance to ALS inhibitors. Copyright © 2005 Society of Chemical Industry" @default.
- W2117514152 created "2016-06-24" @default.
- W2117514152 creator A5065851662 @default.
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- W2117514152 date "2005-09-09" @default.
- W2117514152 modified "2023-10-11" @default.
- W2117514152 title "Effect of chlorimuron‐ethyl on <i>Bradyrhizobium japonicum</i> and its symbiosis with soybean" @default.
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- W2117514152 doi "https://doi.org/10.1002/ps.1077" @default.
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