Marie Jasieniuk

Marie Jasieniuk

Position Title

  • Faculty
UC Davis, One Shields Ave, Davis CA 95616


  • Ph.D., McGill University; Biology, 1985
  • M.Sc., University of Saskatchewan; Plant Ecology, 1979
  • B.Sc. Hons, University of Saskatchewan; Biology, 1974

Research interests and expertise: 

The overall goal of my research program is to advance understanding of the processes underlying the introduction, evolution and spread of weeds. A sound understanding of these processes will lead to improved weed management and prevention programs. To address questions concerning weed invasions and the evolution of weed adaptations, my lab integrates genetic (molecular, population, inheritance) studies with ecological (phenotypic, spatial, demographic) studies. Our research focuses on two weed systems: (1) agricultural weeds evolving resistance to herbicides and (2) invasive weeds with horticultural origins. The two systems are not only ideal for research on processes underlying weed evolution and spread, but also include some of the worst weed problems in California. Thus, our studies have direct implications for improving the management of economically and environmentally significant plant pests in the state.

Current projects: 

  • ìEvolutionary changes in ryegrass populations since detection of glyphosate resistance and communication of resistance management strategiesî funded by USDA-NIFA-AFRI
  • ìUse of Italian Ryegrass (Lolium multiflorum) from California as a model to characterize resistance to glufosinateî funded by Bayer CropScience AG, Germany

Current teaching: 

  • Plant Biology Graduate Group Core Course: Genetics and Evolution; PBI 200A (fall quarter)
  • Introduction to Biology: Principles of Ecology and Evolution; BIS 2B (winter quarter)
  • Plants and Society; PLS/SAS 12 (spring quarter)

External activities that contribute to scholarship:

  • Associate Editor, Invasive Plant Science and Management
  • Associate Editor, Weed Science

Prizes, Awards, Honors

  • David W. Staniforth Memorial Lecture, Iowa State University, 2016

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Social media links:



  • Agricultural weeds
  • Horticultural invasives
  • Population genetics
  • Weed evolution
  • Weed adaptation
  • Weed genetics
  • Weed ecology
  • Herbicide resistance