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Glyphosate- and Dicamba-Resistant Genes Are Not Linked in Kochia (Bassia scoparia)

Published online by Cambridge University Press:  18 December 2018

Junjun Ou
Affiliation:
Former Graduate Student, Department of Agronomy, Kansas State University, Manhattan, KS, USA
Allan K. Fritz
Affiliation:
Professor, Department of Agronomy, Kansas State University, Manhattan, KS, USA
Phillip W. Stahlman
Affiliation:
Professor, Agricultural Research Center–Hays, Kansas State University, Hays, KS, USA
Randall S. Currie
Affiliation:
Associate Professor, Southwest Research and Extension Center, Kansas State University, Garden City, KS, USA
Mithila Jugulam*
Affiliation:
Associate Professor, Department of Agronomy, Kansas State University, Manhattan, KS, USA
*
Author for correspondence: Mithila Jugulam, Department of Agronomy, Kansas State University, 2004 Throckmorton Plant Sciences Center, 1712 Claflin Road, Manhattan, KS 66506. (Email: mithila@ksu.edu)

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.

Type
Research Article
Copyright
© Weed Science Society of America, 2018. 

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