Abstract
Abstract Imidazolinone herbicides inhibit the first enzyme of branched‐chain amino acid biosynthesis, acetohydroxyacid synthase. The inhibition of the enzyme in vitro by these herbicides increases with incubation time, but is not irreversible, as deduced by reaction progress curves. In contrast to this result is the apparent irreversible inhibition of the enzyme by these imidazolinones that occurs when the herbicide is applied to intact corn plants. Plants treated with imidazolinone herbicide and then extracted showed dramatically reduced enzyme activity. This effect on extractable enzyme level occurred with several different imidazolinone herbicides in either foliar or soil application. The decrease in extractable enzyme activity could be observed within four hours after treatment. Herbicides other than imidazolinones did not reduce the extractable enzyme level. These findings suggest that the enzyme‐ imidazolinone interaction in vivo may be different from the interaction observed in vitro.
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Claims 3
Claim · model-written summary
Corn plants treated with imidazolinone herbicide and then extracted showed dramatically reduced enzyme activity.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- imidazolinone herbicidee1
- Outcome
- enzyme activitye1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact corn plants”
e1“Plants treated with imidazolinone herbicide and then extracted showed dramatically reduced enzyme activity”
Claim · model-written summary
The decrease in extractable enzyme activity in corn could be observed within four hours after treatment.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- decrease in extractable enzyme activitye1
- Qualifier
- within four hours after treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact corn plants”
e1“The decrease in extractable enzyme activity could be observed within four hours after treatment”
Claim · model-written summary
Herbicides other than imidazolinones did not reduce the extractable enzyme level in corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Herbicides other than imidazolinonese1
- Outcome
- extractable enzyme levele1
- Direction
- did not reducee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact corn plants”
e1“Herbicides other than imidazolinones did not reduce the extractable enzyme level”
The same questions in other papers
herbicide · physiology: enzyme activity · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.