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Characterization of Wild Oat (Avena fatua L.) Populations and an Inbred Line with Multiple Herbicide Resistance

Published online by Cambridge University Press:  12 June 2017

Anthony J. Kern
Affiliation:
Dep. Plant, Soil, and Environ. Sci., Montana State University, Bozeman, MT 59717-0312
Corey T. Colliver
Affiliation:
Dep. Plant, Soil, and Environ. Sci., Montana State University, Bozeman, MT 59717-0312
Bruce D. Maxwell
Affiliation:
Dep. Plant, Soil, and Environ. Sci., Montana State University, Bozeman, MT 59717-0312
Peter K. Fay
Affiliation:
Dep. Plant, Soil, and Environ. Sci., Montana State University, Bozeman, MT 59717-0312
William E. Dyer
Affiliation:
Dep. Plant, Soil, and Environ. Sci., Montana State University, Bozeman, MT 59717-0312

Abstract

Repeated use of the preemergence herbicide triallate has selected for wild oat populations that are resistant (R) to field use rates. Field collections and an inbred R line were shown in greenhouse and petri dish dose response experiments to be 6- to 20-fold more tolerant to triallate than susceptible (S) lines. R populations and the inbred line were also resistant (8-fold) to the related thiocarbamate herbicide diallate, as well as to the chemically unrelated postemergence herbicide difenzoquat (60-fold). 14C-triallate uptake and translocation patterns were similar between R and S lines for the first 24 h after application. However, translocation of radioactivity was more rapid in S lines than R lines from 24 through 60 h after application. 14C-difenzoquat uptake was the same in R and S lines 12 h after application, but was 10 to 20% higher in R lines than S lines by 24 through 96 h after application. Similarly, translocation of radioactivity after 14C-difenzoquat application was 7 to 14% greater in R than S lines after 12 h, although translocated radioactivity amounts were not significantly different between R and S lines. The relatively minor differences in triallate and difenzoquat uptake and translocation patterns between R and S lines are most likely not of sufficient magnitude to explain the observed resistance levels.

Type
Weed Biology and Ecology
Copyright
Copyright © 1996 by the Weed Science Society of America 

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