2015
Understanding the genetic basis of glyphosate resistance in kochia (K. scoparia)
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Contributor/Checkoff:
Kansas Soybean Commission
Category:
Sustainable Production
Keywords:
AgricultureCrop protectionHerbicide
Parent Project:
Understanding the genetic basis of glyphosate resistance in kochia (K. scoparia)
Lead Principal Investigator:
Mithila Jugulam, Kansas State University
Co-Principal Investigators:
Project Code:
1565
Contributing Organization (Checkoff):
Kansas Soybean Commission
(n/a)
Institution Funded:
Kansas State University
(n/a)
Brief Project Summary:

Kochia has become a troublesome weed as it is highly adaptive and grows on many soils. Because of continuous use of glyphosate in a no-till system, several populations of resistant kochia have evolved. The overall goal of the research is to better predict and manage glyphosate resistance in kochia by understanding the genetic basis; specifically, the inheritance of glyphosate resistance in this weed. As glyphosate is widely used in soybean production and kochia (K. scoparia) is a problem weed, proactive management practices can be implemented to reduce the spread of the resistance. This research will determine the genetic basis of resistance using glyphosate-resistant and susceptible kochia populations.

Key Benefactors:
farmers, agronomists, ag retailers, extension specialists

Information And Results
Project Deliverables

Final Project Results

The results suggest that the F1 plants from reciprocal crosses were all resistant to glyphosate suggesting that the glyphosate resistance is a nuclear trait in kochia. Furthermore, florescent in situ hybridization analysis was performed on glyphosate-resistant and –susceptible kochia chromosomes. The results indicate for the first time that the EPSPS copies are arranged in tandem and are located close to the telomere region of the chromosomes. These results suggest that the EPSPS amplification may have occurred as a result of unequal recombination. We have also tested kochia populations from Kansas for multiple herbicide resistance. The results suggest that these populations are at least resistant to more than 2 modes of action of herbicides. Multiple herbicide resistant kochia is a major challenge for kochia management.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.