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Translocation and Absorption of Glyphosate in Flowering Sicklepod (Senna obtusifolia)

Published online by Cambridge University Press:  20 January 2017

Eric R. Walker  and
Lawrence R. Oliver
Eric R. Walker*
Affiliation:
Crop Genetics and Production Research Unit, United States Department of Agriculture–Agricultural Research Service, 605 Airways Blvd., Jackson, TN 38301
Lawrence R. Oliver
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
*
Corresponding author's E-mail: [email protected]
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Abstract

Sicklepod is a competitive and prolific weed that emerges throughout the crop season. Glyphosate applications to flowering sicklepod greatly reduce seed production, but there is limited information on glyphosate translocation in flowering weeds. Therefore, a laboratory study was conducted to document the absorption and translocation of 14C-glyhosate in flowering sicklepod. Flowering sicklepod plants were treated with a 14C-glyphosate solution, and 14C-glyphosate absorption and translocation was quantified by scintillation spectrometry. Absorption and translocation of 14C-glyphosate in flowering sicklepod were similar for both 0.21 and 0.42 kg ae ha−1 glyphosate. Although the treated leaflets retained approximately 50% of the recovered 14C-glyphosate, movement of the herbicide was both acropetal and basipetal, with the highest 14C-glyphosate concentrations in the shoot below the treated leaf and the roots. By 96 h after treatment, sicklepod buds and flowers had abscised, but analysis of the structures revealed accumulation of 2% of the recovered 14C-glyphosate. Based on results of the study, effects of glyphosate accumulation in buds and flowers combined with plant stress associated with the primary and secondary effects of glyphosate result in bud and flower abscission, drastically reducing sicklepod seed production.

Keywords

Glyphosate, sicklepod, Senna obtusifolia (L.) Irwin and Barneby CASOB.Flowerseed productionsoil seedbank
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 56 , Issue 3 , June 2008 , pp. 338 - 343
Copyright
Copyright © Weed Science Society of America 

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