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Plant Physiology 93:962-966 (1990)
© 1990 American Society of Plant Biologists

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Metabolism and Enzymology

Cross-Resistance of a Chlorsulfuron-Resistant Biotype of Stellaria media to a Triazolopyrimidine Herbicide 1

Linda M. Hall and Malcolm D. Devine

Department of Crop Science and Plant Ecology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N OWO

A biotype of Stellaria media (L.) Vill. has been identified that is highly resistant to the herbicide chlorsulfuron. Resistance is due to an altered acetolactate synthase (ALS) that is much less sensitive to chlorsulfuron than the ALS from the susceptible (S) biotype. The S biotype was extremely sensitive to D489 (N-[2,6-dichlorophenyl]-5,7-dimethyl-1,2,4-triazolo[1,5a] pyrimidine-2-sulfonamide), a member of a new class of triazolopyrimidine herbicides, while the chlorsulfuron-resistant biotype exhibited complete cross-resistance at both the whole plant and enzyme levels. ALS activity of the S biotype was reduced by approximately 90% in the presence of 0.1 micromolar D489, while that of the R biotype was reduced by less than 10%. This result suggests that the two herbicides share a common binding site on ALS. Only very slight cross-resistance at the ALS level was found to imazamethabenz, an imidazolinone herbicide.

1 Research funded by the Natural Sciences and Engineering Research Council of Canada. L. M. H. is the recipient of a University of Saskatchewan Graduate Scholarship.




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C. E. Whitcomb
An introduction to ALS-inhibiting herbicides
Toxicology and Industrial Health, February 1, 1999; 15(1-2): 232 - 240.
[Abstract] [PDF]


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