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Absorption, Translocation, and Metabolism of Rimsulfuron in Black Nightshade (Solanum nigrum), Eastern Black Nightshade (Solanum ptycanthum), and Hairy Nightshade (Solanum sarrachoides)

Published online by Cambridge University Press:  12 June 2017

John A. Ackley ,
Kriton K. Hatzios  and
Henry P. Wilson
John A. Ackley
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0331 and Painter, VA 23420
Kriton K. Hatzios*
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0331 and Painter, VA 23420
Henry P. Wilson
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0331 and Painter, VA 23420
*
Corresponding author's E-mail: [email protected].
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Abstract

Absorption, translocation, and metabolism of rimsulfuron were studied in three solanaceous weeds. Eastern black nightshade is sensitive (> 95% injury), hairy nightshade is moderately sensitive (50 to 99% injury), and black nightshade is tolerant to rimsulfuron postemergence (POST). Seedlings at the four- to six-leaf stage were treated with foliar-applied 14C-labeled rimsulfuron for 3, 6, 24, and 48 h after treatment. Absorption of rimsulfuron by all weeds increased with time. Black and eastern black nightshade absorbed comparable amounts of radioactivity at each exposure time. Hairy nightshade absorbed less radiolabeled herbicide than the other two nightshades at any treatment time. Hairy nightshade absorbed 54% of the applied radioactivity at 48 h, compared to 74% absorbed by the other weeds. Translocation of rimsulfuron out of the treated leaf was rapid in all species. Black and eastern black nightshade translocated 50 to 70% of the absorbed radioactivity out of the treated leaf with 40 to 50% moving to the upper foliage. In hairy nightshade, about 40% of the absorbed radioactivity translocated out of the treated leaf with equal amounts moving to the upper and lower foliage. Metabolism of 14C-rimsulfuron was rapid in the three nightshades with approximately 54% remaining as rimsulfuron at 3 h after treatment. The levels of the detected metabolites of rimsulfuron were similar in the three nightshade weeds. Differential early uptake and translocation may account for the differential sensitivity of these nightshade species to rimsulfuron.

Keywords

Rimsulfuron, N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(ethylsulfonyl)-2-pyridinesulfonamideblack nightshade, Solanum nigrum L. # SOLNIeastern black nightshade, Solanum ptycanthum Dun. # SOLPThairy nightshade, Solanum sarrachoides Sendtner # SOLSANightshade weedsherbicide toleranceherbicide sensitivityALS, acetolactate synthaseHAA, hours after applicationLSS, liquid scintillation spectrometryPOST, postemergenceRf, ratio of frontTLC, thin-layer chromatography
Type
Research
Information
Weed Technology , Volume 13 , Issue 1 , March 1999 , pp. 151 - 156
Copyright
Copyright © 1999 by the Weed Science Society of America 

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