Abstract
Two mechanisms by which plants are resistant to triazolopyrimidine sulfonanilide herbicides are alterations in ALS target site sensitivity and metabolic detoxification. Examples of the latter include O-dealkylation and triazolopyrimidine ring cleavage in soybeans, alkyl oxidation in wheat and soybeans, and glucose conjugation in wheat. Differential rates of metabolism through common and species-specific pathways result in differential sensitivity at the whole plant level. Modifications in ALS can also impart tolerance. Evaluation of sulfonylurea and imidazolinone resistant weeds for sensitivity to triazolopyrimidines suggests greater likelihood of cross-resistance from sulfonylureas. A rapid method to identify target-site based resistance is described.
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Abbreviations
- AHAS:
-
acetohydroxyacid synthase
- ALS:
-
acetolactate synthase
- C:
-
Celsius
- CPCA:
-
1,1 -cyclopropanedicarboxylic acid
- gha−1 :
-
grams per hectare
- gfw:
-
gram fresh weight
- GR80 :
-
application rate of compound resulting in 80% reduction of growth
- h:
-
hour
- I50 :
-
concentration of inhibitor resulting in 50% inhibition
- IM:
-
Imidazolinone
- KARI:
-
ketol-acid reductoisomerase
- NA:
-
not available
- ppm:
-
parts per million
- R:
-
resistant
- R/S:
-
ratio of activity in resistant divided by activity in susceptible
- S:
-
susceptible
- SU:
-
sulfonylurea
- T1/2 :
-
half-life
- TP:
-
triazolopyrimidine sulfonanilide
- µg:
-
Microgram
- µM:
-
Micromolar
- <:
-
less than
- >:
-
greater than
- %:
-
Percent
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© 1994 Springer-Verlag Berlin Heidelberg
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Gerwick, B.C., DeBoer, G.J., Schmitzer, P.R. (1994). Mechanisms of Tolerance to Triazolopyrimidine Sulfonanilide Herbicides. In: Stetter, J. (eds) Herbicides Inhibiting Branched-Chain Amino Acid Biosynthesis. Chemistry of Plant Protection, vol 10. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79107-9_7
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DOI: https://doi.org/10.1007/978-3-642-79107-9_7
Publisher Name: Springer, Berlin, Heidelberg
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