Uptake, translocation and metabolism of the herbicide florasulam in wheat and broadleaf weeds

Pest Management Science
Gerrit J deBoerRobert J Ehr

Abstract

Florasulam is a triazolopyrimidine sulfonanilide post-emergence broadleaf herbicide for use in wheat (Triticum aestivum L.). The selectivity of florasulam to wheat has been determined to be related primarily to a differential rate of metabolism between wheat with a half-life of 2.4 h and broadleaf weeds with half-lives ranging from 19 to >48 h. To a lesser extent, selectivity, at least for the broadleaf weed cleavers (Galium aparine L.), involves uptake differences. Rate of metabolism data were generated using greenhouse-grown plants injected with radiolabelled florasulam and subsequent extraction and processing by high-performance liquid chromatography (HPLC). Structures of metabolites were determined by isolation for nuclear magnetic resonance and liquid chromatography/mass spectrometry. Wheat plants metabolised florasulam by hydroxylation of the aniline ring para to the nitrogen, followed by conjugation to glucose. Metabolism by broadleaf weeds was so slow that isolation of metabolite was not possible, but comparison of HPLC data suggested hydroxylation as the major pathway.

Citations

Jan 17, 2019·Environmental Science and Pollution Research International·Yuxin QiaoFeng Liu
Feb 27, 2007·Planta·Alejandro Perez-JonesCarol A Mallory-Smith
Feb 23, 2020·Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment·Yingying BiQiong Wu
Jul 21, 2017·Journal of Environmental Quality·Wangcang SuChuantao Lu
Mar 28, 2009·Journal of Agricultural and Food Chemistry·Hagai YasuorAlbert J Fischer
Jun 11, 2021·The Science of the Total Environment·Jing Jing Zhang, Hong Yang
Mar 26, 2013·Environmental Science & Technology·Peter Fantke, Ronnie Juraske

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