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Physiological Mechanism for Tall Morningglory (Ipomoea Purpurea) Resistance to DPX-PE350

Published online by Cambridge University Press:  12 June 2017

Shay L. Sunderland ,
James D. Burton ,
Harold D. Coble  and
Eleanor P. Maness
Shay L. Sunderland
Affiliation:
Dep. Crop Sci., N.C. State Univ.
James D. Burton
Affiliation:
Dep. Hortic. Sci., N.C. State Univ., Raleigh, NC 27695
Harold D. Coble
Affiliation:
Dep. Crop Sci., N.C. State Univ.
Eleanor P. Maness
Affiliation:
Dep. Hortic. Sci., N.C. State Univ., Raleigh, NC 27695
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Abstract

Laboratory experiments were conducted to determine the physiological mechanism of tall morningglory resistance to the experimental cotton herbicide DPX-PE350. Tall morningglory, a resistant species, was compared with entireleaf morningglory, a sensitive species, to evaluate inhibition at the site of action, the acetolactate synthase (ALS) enzyme (E.C.4.1.3.18), by DPX-PE350 as well as uptake, translocation, and metabolism of DPX-PE350. No differences were found between species in the concentration required to inhibit the ALS enzyme by 50% (I50), or in uptake and translocation of the herbicide. Tall morningglory metabolized the herbicide more rapidly than did entireleaf morningglory. Tall morningglory contained 3.6 and 1.4 times more metabolites of DPX-PE350 than did entireleaf morningglory 6 and 24 h after treatment, respectively. Tall morningglory produced an O-desmethyl metabolite from the 3,5-dimethoxypyrimidine moiety of DPX PE350 that was not found in entireleaf morningglory. These data suggest that the ability of tall morningglory to more rapidly metabolize DPX-PE350, possibly through the production of the pyrimidinyldesmethyl metabolite, may be the mechanism of resistance to DPX-PE350.

Keywords

DPX-PE350, sodium 2-chloro-6-(3,5-dimethoxy-pyrimidin-2-ylthio) benzoateentireleaf morningglory, Ipomoea hederacea var. integriuscula (L.) Jacq. #3 IPOHGtall morningglory, Ipomoea purpurea (L.) Roth # PHPBUUptaketranslocationmetabolismacetolactate synthase inhibitionIPOMGPHPBU
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 21 - 27
Copyright
Copyright © 1995 by the Weed Science Society of America 

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