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Effect of chlorimuron‐ethyl on Bradyrhizobium japonicum and its symbiosis with soybean by Dr Myriam S Zawoznik; María L Tomaro is a Agricultural and Biological Sciences article available to read on EtoBox.

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## 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 acti

Who reads Effect of chlorimuron‐ethyl on Bradyrhizobium japonicum and its symbiosis with soybean?

Author

Dr Myriam S Zawoznik; María L Tomaro

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1526-498X)

Published

2005

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)