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Fluazifop-P Inhibits Terbacil Metabolism in Strawberry (Fragaria × ananassa)

Published online by Cambridge University Press:  20 January 2017

Jill L. Rogers ,
Douglas J. Doohan ,
A. Robin Robinson ,
Klaus I. N. Jensen  and
Sonia O. Gaul
Jill L. Rogers
Affiliation:
Department of Soils and Chemistry, Nova Scotia Agricultural College, Truro, NS, Canada B2N 5E3
Douglas J. Doohan*
Affiliation:
Nova Scotia Department of Agriculture and Marketing, Truro, NS, Canada B2N 5E3
A. Robin Robinson
Affiliation:
Department of Soils and Chemistry, Nova Scotia Agricultural College, Truro, NS, Canada B2N 5E3
Klaus I. N. Jensen
Affiliation:
Atlantic Food and Horticulture Research Centre, Agriculture and Agri-Food Canada, Kentville, NS, Canada B4N 1J5
Sonia O. Gaul
Affiliation:
Atlantic Food and Horticulture Research Centre, Agriculture and Agri-Food Canada, Kentville, NS, Canada B4N 1J5
*
Corresponding author's E-mail: [email protected].
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Abstract

We examined the effect of a postemergence application of fluazifop-P on root uptake, translocation, and metabolism of 14C-terbacil in ‘Kent’ strawberry. Fluazifop-P had no effect on uptake of 14C-terbacil from a nutrient solution over 48 h, nor did it affect the proportional distribution of 14C-label in the plants. The 14C-label was readily translocated to the foliage where it tended to accumulate in vascular tissue. Fluazifop-P reduced the overall conversion of 14C-terbacil to metabolites by about 50%. Thin layer chromatography of methanol extracts of leaflets, petioles, crowns, and roots separated the 6-hydroxymethyl derivative, and several unidentified metabolites, including a major water-soluble metabolite at the origin. At least 50% of the latter could be converted to the 6-hydroxymethyl metabolite by β-glucosidase, but other metabolites could be separated in other solvent systems. The levels of metabolites were generally two- to threefold higher in plants treated with terbacil alone than in those pretreated with fluazifop-P. Therefore, we conclude that the interaction observed between these herbicides in the field results from fluazifop-P inhibiting detoxification of terbacil by strawberry.

Keywords

Fluazifop-Pterbacilstrawberry, Fragaria × ananassa Duchensne ‘Kent’Herbicide interactionsynergismroot uptakeGC-ECD, gas chromatography electron capture detectionGC-MSD, gas chromatography mass spectrum detectionHPLC, high-performance liquid chromatographyLSS, liquid scintillation spectrometryPPFD, photosynthetic photon flux densitySEM, standard error of the meanTLC, thin layer chromatography
Type
Research
Information
Weed Technology , Volume 15 , Issue 2 , June 2001 , pp. 320 - 326
Copyright
Copyright © Weed Science Society of America 

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