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Recurrent selection with glufosinate at low rates reduces the susceptibility of a Lolium perenne ssp. multiflorum population to glufosinate

View ORCID ProfileMaor Matzrafi, Sarah Morran, Marie Jasieniuk
doi: https://doi.org/10.1101/2020.07.04.182733
Maor Matzrafi
1Department of Plant Sciences, University of California-Davis, Davis, CA 95616, USA
2Department of Plant Pathology and Weed Research, Agricultural Research Organization, Newe Ya’ar Research Center, Israel
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  • For correspondence: maorm@volcani.agri.gov.il
Sarah Morran
1Department of Plant Sciences, University of California-Davis, Davis, CA 95616, USA
3Department of Bioagricultural Sciences and Pest Management, 1177 Campus Delivery, Colorado State University, Fort Collins, CO, 80523, USA
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Marie Jasieniuk
1Department of Plant Sciences, University of California-Davis, Davis, CA 95616, USA
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ABSTRACT

Repeated applications of herbicides at the labelled rates have often resulted in the selection and evolution of herbicide-resistant weeds capable of surviving the labelled and higher rates in subsequent generations. However, the evolutionary outcomes of recurrent herbicide selection at low rates are far less understood. In this study of an herbicide-susceptible population of Lolium perenne ssp. multiflorum, we assessed the potential for low glufosinate rates to select for reduced susceptibility to the herbicide, and cross-resistance to herbicides with other modes of action. Reduced susceptibility to glufosinate was detected in progeny in comparison with the parental population following three rounds of selection at low glufosinate rates. Differences were mainly observed at the 0.5X, 0.75X, and 1X rates. Comparing the parental susceptible population and progeny from the second and third selection cycle, the percentage of surviving plants increased to values of LD50 (1.31 and 1.16, respectively) and LD90 (1.36 and 1.26, respectively). When treated with three alternative herbicides (glyphosate, paraquat, and sethoxydim), no plants of either the parental or successive progeny populations survived treatment with 0.75X or higher rates of these herbicides. The results of this study provide clear evidence that reduced susceptibility to glufosinate can evolve in weed populations following repeated applications of glufosinate at low herbicide rates. However, the magnitude of increases in resistance levels over three generations of recurrent low-rate glufosinate selection observed is relatively low compared with higher levels of resistance observed in response to low-rate selection with other herbicides (three fold and more).

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted July 06, 2020.
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Recurrent selection with glufosinate at low rates reduces the susceptibility of a Lolium perenne ssp. multiflorum population to glufosinate
Maor Matzrafi, Sarah Morran, Marie Jasieniuk
bioRxiv 2020.07.04.182733; doi: https://doi.org/10.1101/2020.07.04.182733
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Recurrent selection with glufosinate at low rates reduces the susceptibility of a Lolium perenne ssp. multiflorum population to glufosinate
Maor Matzrafi, Sarah Morran, Marie Jasieniuk
bioRxiv 2020.07.04.182733; doi: https://doi.org/10.1101/2020.07.04.182733

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