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Nicosulfuron and Primisulfuron Root Uptake, Translocation, and Inhibition of Acetolactate Synthase in Sugarbeet (Beta vulgaris)

Published online by Cambridge University Press:  12 June 2017

Karen M. Novosel  and
Karen A. Renner
Karen M. Novosel
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
Karen A. Renner
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
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Abstract

Field studies have shown primisulfuron to be more injurious to sugarbeet than nicosulfuron 1 and 2 yr after herbicide application. Experiments were initiated to determine if primisulfuron is more injurious to sugarbeet grown in a nutrient culture and if the difference in sugarbeet response is a result of greater uptake, translocation, or acetolactate synthase (ALS) site sensitivity with primisulfuron. Concentrations of primisulfuron and nicosulfuron that reduced sugarbeet growth by 50% were 1.9 and 8.9 μg ai L−1, respectively, at pH 6.5. The pH of the nutrient solution did not influence sugarbeet response to either herbicide. Uptake of primisulfuron was greater (3%) than that of nicosulfuron (1%). Translocation (expressed as a percent of uptake) of nicosulfuron was more rapid than primisulfuron. Fifty-seven percent of the absorbed nicosulfuron translocated out of the root during the 12-h pulse period, while an equal concentration of primisulfuron was not translocated out of the root until 48 h after pulsing. The total nicosulfuron translocated after 144 h was half that of primisulfuron. The nutrient solution taken up by sugarbeet in the 12-h pulse period was reduced by 41% in the presence of either herbicide compared to the untreated control. The ALS enzyme was a minimum of 15 times more sensitive to primisulfuron compared to nicosulfuron which may account for greater sugarbeet response to primisulfuron.

Keywords

nicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamideprimisulfuron, 2-[[[[[4,6-bis(difluromethoxy)-2-pyrimidinyl] amino]carbonyl]amino]sulfonyl]benzoic acidsugarbeet (Beta vulgaris L.)AbsorptionhydroponicsALSacetohydroxy acid synthase (AHAS)
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 43 , Issue 3 , September 1995 , pp. 342 - 346
Copyright
Copyright © 1995 by the Weed Science Society of America 

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