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Inheritance of Resistance to The Auxinic Herbicide Dicamba in Kochia (Kochia scoparia)

Published online by Cambridge University Press:  20 January 2017

Christopher Preston ,
David S. Belles ,
Philip H. Westra ,
Scott J. Nissen  and
Sarah M. Ward
Christopher Preston*
Affiliation:
School of Agriculture, Food and Wine, University of Adelaide, PMB 1, Glen Osmond SA 5064, Australia
David S. Belles
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523, USA
Philip H. Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523, USA
Scott J. Nissen
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523, USA
Sarah M. Ward
Affiliation:
Department of Soil and crop Sciences, Colorado State University, Fort Collins, CO 80523
*
Corresponding author's E-mail: christopher.preston@adelaide.edu.au
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Abstract

The inheritance of resistance to the auxinic herbicide dicamba was examined in a kochia population from Nebraska. An inbred, resistant line was developed by selection and selfing over seven generations to ensure any resistance alleles would be homozygous in the parents. An inbred, susceptible line was similarly developed, but without selection. Dose–response experiments with dicamba determined a glyphosate-resistant concentration required to inhibit dry weight accumulation by 50% (GR50) of 45 and 1,331 g ae ha−1 for the susceptible and resistant populations, respectively. F1 crosses were made between resistant and susceptible inbred individuals by hand-pollination, and the F1 plants were selfed to produce F2 plants. The F2 population was screened with 280 g ha−1 dicamba, a rate that could discriminate between susceptible and resistant plants. A total of eight F2 families were screened twice. In the first screen, seven F2 families segregated in a 3:1 ratio, consistent with a single dominant allele controlling resistance, and in the second screen six F2 families segregated in a 3:1 ratio. F2 individuals were selfed, the F3 progeny were tested with 280 g ha−1 dicamba, and the genotype of each F2 parent was determined based on F3 progeny segregation. F3 family segregation was consistent with the F2 parents having a 1:2:1 homozygous-susceptible:heterozygote:homozygous-resistant pattern, confirming that resistance to dicamba in kochia is likely conferred by a single allele with a high degree of dominance.

Keywords

Dicambakochia, Kochia scoparia (L.) Schrad. KCHSCDicamba resistanceinheritancesegregation
Type
Weed Biology and Ecology
Information
Weed Science , Volume 57 , Issue 1 , February 2009 , pp. 43 - 47
Copyright
Copyright © Weed Science Society of America 

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