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Mechanisms of Tolerance to Triazolopyrimidine Sulfonanilide Herbicides

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Herbicides Inhibiting Branched-Chain Amino Acid Biosynthesis

Part of the book series: Chemistry of Plant Protection ((PLANT PROTECTIO,volume 10))

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

  • Print ISBN: 978-3-642-79109-3

  • Online ISBN: 978-3-642-79107-9

  • eBook Packages: Springer Book Archive

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