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Boll Abscission Responses of Glyphosate-Resistant Cotton (Gossypium hirsutum) to Glyphosate

Published online by Cambridge University Press:  20 January 2017

Ryan P. Viator*
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, Box 2474, College Station, TX 77843
Scott A. Senseman
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, Box 2474, College Station, TX 77843
Joe T. Cothren
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, Box 2474, College Station, TX 77843
*
Corresponding author's E-mail: [email protected]

Abstract

Response of glyphosate-resistant cotton to various rates of topically applied glyphosate was investigated in growth chamber experiments to determine the relationship between glyphosate rate and boll abscission. Glyphosate at 0, 0.56, 1.12, or 2.24 kg ai/ha was applied to all exposed foliage at the 12-leaf growth stage. Immediately after this treatment, 14C-glyphosate was applied to the three uppermost fully expanded leaves at 0, 37, 74, or 148 kBq per leaf for the 0, 0.56, 1.12, or 2.24 kg/ha treatment, respectively. After glyphosate application, glyphosate accumulated in reproductive tissue, and bolls were abscised. Abscission increased as the amount of glyphosate translocated to fruiting sites increased.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Crop Science Department, North Carolina State University, Box 7620, Raleigh, NC 27695.

References

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