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Physiological Basis for Differential Selectivity of Four GrassSpecies to Aminocyclopyrachlor

Published online by Cambridge University Press:  20 January 2017

Ethan T. Parker ,
Glenn R. Wehtje ,
J. Scott McElroy ,
Michael L. Flessner  and
Peter Panizzi
Ethan T. Parker
Affiliation:
Department of Crop, Soil, and Environmental Sciences, Auburn University, 201 Funchess Hall, Auburn University, AL 36849
Glenn R. Wehtje
Affiliation:
Department of Crop, Soil, and Environmental Sciences, Auburn University, 201 Funchess Hall, Auburn University, AL 36849
J. Scott McElroy*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, Auburn University, 201 Funchess Hall, Auburn University, AL 36849
Michael L. Flessner
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Tech, 435 Old Glade Road, Blacksburg, VA 24061
Peter Panizzi
Affiliation:
Harrison School of Pharmacy, Auburn University, 4306 Walker Building, Auburn University, AL 36849
*
Corresponding author's E-mail: jsm0010@auburn.edu
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Abstract

Aminocyclopyrachlor (AMCP) is a synthetic auxin herbicide used for broadleafweed control in pasture and rangeland. The tolerance and fate of AMCP withinpertinent grass species is not well understood. Research was conducted toestablish the tolerance of four grass species to AMCP application andobserve their absorption, translocation, and metabolism. Results indicatethat tall fescue is the most tolerant of AMCP at rates required for weedcontrol. Bahiagrass and bermudagrass are marginally tolerant, and cogongrassis the most sensitive. Tall fescue and bahiagrass absorbed more AMCP thanbermudagrass and cogongrass, but cogongrass absorption is the most rapid andcomplete within 2 days after treatment (DAT). Cogongrass and bermudagrasstranslocated the least amount out of the target area, whereas bahiagrass andtall fescue translocated the most. Radioisotope imaging revealed that tallfescue may sequester absorbed AMCP in leaf tips. This sequestering may bethe basis of the greater tolerance to AMCP by tall fescue relative to theother species evaluated. No metabolism of AMCP was detected in any grassspecies out to 42 DAT.

Keywords

Aminocyclopyrachlorbahiagrass, Paspalum notatum Flueggébermudagrass, Cynadon dactylon (L.) Pers.cogongrass, Imperata cylindrica (L.) Beauv.tall fescue, Lolium arundinaceum (Schreb.) S.J.Darbyshire.Absorptionherbicide fatemetabolismsynthetic auxintranslocation

Information

Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 63 , Issue 4 , December 2015 , pp. 788 - 798
Copyright
Copyright © Weed Science Society of America 

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References

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