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Distribution and Characteristics of Triazine-Resistant Powell Amaranth (Amaranthus powellii) in Idaho

Published online by Cambridge University Press:  12 June 2017

Charlotte V. Eberlein ,
Kassim Al-Khatib ,
Mary J. Guttieri  and
E. Patrick Fuerst
Charlotte V. Eberlein
Affiliation:
Univ. Idaho, Aberdeen, ID 83210
Kassim Al-Khatib
Affiliation:
Washington State Univ., Prosser, WA 99350
Mary J. Guttieri
Affiliation:
Univ. Idaho, Aberdeen, ID 83210
E. Patrick Fuerst
Affiliation:
Washington State Univ., Pullman, WA 99164
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Abstract

A triazine-resistant (TR) biotype of Powell amaranth was discovered in 1989 in a potato field treated with metribuzin. A survey of all agricultural counties in Idaho showed that the TR Powell amaranth infestation was localized in the southeastern corner of Gooding county in southern Idaho. To determine the mechanism of triazine resistance, I50 values for inhibition of photosystem II were determined for atrazine, metribuzin, and diuron using thylakoids isolated from TR and triazine-susceptible (TS) biotypes. TR/TS ratios based on I50 values were 134 for atrazine, 62 for metribuzin, and 1.9 for diuron. Results of binding studies with atrazine and metribuzin were consistent with the I50 studies, indicating that resistance was due to reduced binding of triazines to the thylakoid membrane D1 protein. Sequencing the chloroplast psbA gene from TR and TS biotypes revealed a serine 264 to glycine change in the TR biotype. The mutation presumably resulted in reduced hydrogen bonding between triazine herbicides and the Dl protein.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminediuron, N′-(3,4-dichlorophenyl)-N, N-dimethylureametribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onePowell amaranth, Amaranthus powellii S. Wats. #3 AMAPOpotato, Solanum tuberosum L.Herbicide resistanceDNA sequencechloroplast assayherbicide bindingAMAPO
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 40 , Issue 4 , December 1992 , pp. 507 - 512
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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