Weed Science (2019) 67, 16-21

Junjun Ou, Allan K. Fritz, Phillip W. Stahlman, Randall S. Currie and Mithila Jugulam (2019)
Glyphosate- and dicamba-resistant genes are not linked in kochia (Bassia scoparia)
Weed Science 67 (1), 16-21
Abstract: Kochia [Bassia scoparia (L.) A. J. Scott] is one of the most troublesome weeds throughout the North American Great Plains. Herbicides such as glyphosate and dicamba have been used widely to control B. scoparia for decades. However, many B. scoparia populations have evolved resistance to these herbicides due to selection. Especially, dicamba-resistant B. scoparia populations are often also found to be glyphosate-resistant. The objective of this research was to determine whether these two herbicide resistances are linked in B. scoparia. Reciprocal crosses were performed between glyphosate- and dicamba-resistant (GDR) and glyphosate- and dicamba-susceptible (GDS) B. scoparia to produce F₁ and F₂ progeny. Two F₁ and seven F₂ progeny families were screened with various doses of dicamba or glyphosate. All the F₁ progeny survived both dicamba and glyphosate treatments. Chi-square analyses of F₂ progeny suggest (1) glyphosate and dicamba resistances in B. scoparia are inherited via single, dominant nuclear genes; and (2) glyphosate- and dicamba-resistant genes are not linked. Thus, the dicamba and glyphosate resistances appear to have evolved independently due to intense selection but do not seem to spread together.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Phillip W. Stahlman, Randall S. Currie, Mithila Jugulam

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bassia scoparia (weed)