Translator Disclaimer
1 October 2007 Differential Response of Several Carotenoid Biosynthesis Inhibitors in Mixtures with Atrazine
Gregory R. Armel, Patrick L. Rardon, Michael C. McComrick, Nancy M. Ferry
Author Affiliations +
Abstract

Greenhouse studies were conducted in 2003 at the Stine–Haskell Research Center to determine whether herbicide inhibitors of six specific sites in the carotenoid biosynthesis pathway would elicit synergistic responses when applied postemergence (POST) in combination with the photosystem II (PSII) inhibitor atrazine. Based on data analysis with the Isobole method, synergistic responses were observed on red morningglory, common cocklebur, and giant foxtail when atrazine was applied in mixtures with the deoxy-D-xylulose-5-phosphate reductoisomerase (DOXP reductoisomerase) inhibitor fosmidomycin, the p-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor mesotrione, and the DuPont proprietary zeta-carotene desaturase (ZDS) inhibitor DFPC. Clomazone (its metabolite ketoclomazone is the actual enzyme inhibitor), an inhibitor of 1-deoxy-D-xylulose-5-phosphate synthatase (DOXP synthase), provided synergistic responses on red morningglory, but antagonistic responses on both common cocklebur and giant foxtail when applied in mixtures with atrazine. Combinations of the lycopene cyclase (LC) inhibitor, CPTA, with atrazine produced synergistic responses on both common cocklebur and giant foxtail but were antagonistic on red morningglory. Norflurazon, a phytoene desaturase (PDS) inhibitor, applied in mixtures with atrazine provided synergistic responses on red morningglory, antagonistic responses on giant foxtail, and independent responses on common cocklebur. Because carotenoids have been determined to play a key role in quenching singlet oxygen species in the chloroplast and also assist in the maintenance of the D1 protein in PSII, this might help explain the synergistic responses with atrazine observed in our studies.

Nomenclature: Atrazine; clomazone; CPTA [2-(4-chloro-phenylsulfanyl)-ethyl]-diethylamine; DFPC N-[5-[(dimethylamino)carbonyl]-2-fluorophenyl]-3-(1,1-dimethylethyl)-1-ethyl-1H-pyrazole-5-carboxamide; fosmidomycin [3-(formyl-hydroxy-amino)-propyl]-phosphonic acid; mesotrione; norflurazon; common cocklebur, Xanthium strumarium L. XANST; giant foxtail, Setaria faberi Herm. SETFA; red morningglory, Ipomoea coccinea L. IPOCC.

Gregory R. Armel, Patrick L. Rardon, Michael C. McComrick, and Nancy M. Ferry "Differential Response of Several Carotenoid Biosynthesis Inhibitors in Mixtures with Atrazine," Weed Technology 21(4), 947-953, (1 October 2007). https://doi.org/10.1614/WT-06-133.1
Received: 10 July 2006; Accepted: 1 June 2007; Published: 1 October 2007
JOURNAL ARTICLE
7 PAGES


Share
SHARE
KEYWORDS
antagonistic
Bleaching herbicides
carotenoid biosynthesis
Isobole method
Photosystem II
postemergence
synergistic
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top