Abstract
Concentrations of fluazifop-butyl sprayed on intact plants caused large decreases in the incorporation of radioactivity from [1-14C]acetate into lipids of barley (Hordeum vulgare) leaves and stems, but did not affect leaves or stems of pea (Pisum sativum). Labelling of all acyl lipids, but not pigments, was reduced. The effects of the active acid form, fluazifop, were also determined in leaf pieces and chloroplasts. Concentrations of (R,S)-fluazifop up to 100 microM had no affect upon quality or quantity of fatty acids produced from [1-14C]acetate in pea. In barley, however, 100 microM-(R,S)-fluazifop caused 89% (leaf) or 100% (chloroplasts) inhibition in labelling of fatty acids from [1-14C]acetate. Lower concentrations of fluazifop (less than 25 microM) caused incomplete inhibition and significant decreases in the proportion of C18 fatty acids synthesized, particularly by isolated chloroplasts. Synthesis of fatty acids from [2-14C]malonate was also inhibited (59%) in barley leaf tissue by 100 microM-(R,S)-fluazifop. The labelling pattern of products showed that elongation reactions were unaffected by the herbicide, but synthesis de novo was specifically diminished. By using resolved stereoisomers, it was found that the (R) isomer was the form which inhibited fatty acid synthesis, a finding that is in agreement with its herbicidal activity. These results suggest that inhibition of fatty acid synthesis de novo forms the basis for the selective mode of action of fluazifop.
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Claims 13
Claim · model-written summary
Fluazifop-butyl decreased acetate incorporation into barley leaf and stem lipids.
- Taxon
- barley (Hordeum vulgare)
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Hordeum vulgaree0 - Organ / stage
- leaves and stemse0
- Treatment
- fluazifop-butyle0
- Outcome
- incorporation of radioactivity from [1-14C]acetate into lipidse0
- Direction
- decreasese0
- Comparator
- pea (Pisum sativum)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Concentrations of fluazifop-butyl sprayed on intact plants caused large decreases in the incorporation of radioactivity from [1-14C]acetate into lipids of barley (Hordeum vulgare) leaves and stems, but did not affect leaves or stems of pea (Pisum sativum).”
Claim · model-written summary
Fluazifop-butyl did not affect pea leaf or stem lipid labeling.
- Taxon
- pea (Pisum sativum)
Lathyrus oleraceuse0 - Treatment
- fluazifop-butyle0
- Outcome
- leaves or stemse0
- Direction
- did not affecte0
- Comparator
- barley (Hordeum vulgare)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of fluazifop-butyl sprayed on intact plants caused large decreases in the incorporation of radioactivity from [1-14C]acetate into lipids of barley (Hordeum vulgare) leaves and stems, but did not affect leaves or stems of pea (Pisum sativum).”
Claim · model-written summary
Acyl lipid labeling fell while pigment labeling did not.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- fluazifop-butyle1
- Outcome
- Labelling of all acyl lipidse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Labelling of all acyl lipids, but not pigments, was reduced.”
t0“barley”
e1“Concentrations of fluazifop-butyl sprayed on intact plants caused large decreases in the incorporation of radioactivity from [1-14C]acetate into lipids of barley (Hordeum vulgare) leaves and stems, but did not affect leaves or stems of pea (Pisum sativum).”
Claim · model-written summary
Up to 100 microM fluazifop did not affect pea fatty acid quantity or quality.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- (R,S)-fluazifop up to 100 microMe0
- Outcome
- quality or quantity of fatty acidse0
- Direction
- no affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of (R,S)-fluazifop up to 100 microM had no affect upon quality or quantity of fatty acids produced from [1-14C]acetate in pea.”
Claim · model-written summary
100 microM fluazifop inhibited barley leaf fatty acid labeling by 89%.
- Taxon
- barleyHordeum vulgaree0
- Organ / stage
- leafe0
- Treatment
- 100 microM-(R,S)-fluazifope0
- Outcome
- labelling of fatty acidse0
- Direction
- inhibitione0
- Value
- 89%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In barley, however, 100 microM-(R,S)-fluazifop caused 89% (leaf) or 100% (chloroplasts) inhibition in labelling of fatty acids from [1-14C]acetate.”
Claim · model-written summary
100 microM fluazifop inhibited barley chloroplast fatty acid labeling by 100%.
- Taxon
- barleyHordeum vulgaree0
- Organ / stage
- chloroplastse0
- Treatment
- 100 microM-(R,S)-fluazifope0
- Outcome
- labelling of fatty acidse0
- Direction
- inhibitione0
- Value
- 100%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In barley, however, 100 microM-(R,S)-fluazifop caused 89% (leaf) or 100% (chloroplasts) inhibition in labelling of fatty acids from [1-14C]acetate.”
Claim · model-written summary
Lower fluazifop concentrations incompletely inhibited fatty acid synthesis.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- fluazifop (less than 25 microM)e0
- Outcome
- incomplete inhibitione0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower concentrations of fluazifop (less than 25 microM) caused incomplete inhibition and significant decreases in the proportion of C18 fatty acids synthesized, particularly by isolated chloroplasts.”
t0“barley”
Claim · model-written summary
Lower fluazifop concentrations significantly reduced the C18 fatty acid proportion.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- isolated chloroplastse0
- Treatment
- fluazifop (less than 25 microM)e0
- Outcome
- proportion of C18 fatty acids synthesizede0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower concentrations of fluazifop (less than 25 microM) caused incomplete inhibition and significant decreases in the proportion of C18 fatty acids synthesized, particularly by isolated chloroplasts.”
t0“barley”
Claim · model-written summary
100 microM fluazifop inhibited malonate-derived fatty acid synthesis in barley leaves by 59%.
- Taxon
- barleyHordeum vulgaree0
- Organ / stage
- leaf tissuee0
- Treatment
- 100 microM-(R,S)-fluazifope0
- Outcome
- Synthesis of fatty acids from [2-14C]malonatee0
- Direction
- inhibitede0
- Value
- 59%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Synthesis of fatty acids from [2-14C]malonate was also inhibited (59%) in barley leaf tissue by 100 microM-(R,S)-fluazifop.”
Claim · model-written summary
Fluazifop did not affect elongation reactions.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- herbicidee0
- Outcome
- elongation reactionse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The labelling pattern of products showed that elongation reactions were unaffected by the herbicide, but synthesis de novo was specifically diminished.”
t0“barley”
Claim · model-written summary
Fluazifop specifically diminished de novo synthesis.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- herbicidee0
- Outcome
- synthesis de novoe0
- Direction
- diminishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The labelling pattern of products showed that elongation reactions were unaffected by the herbicide, but synthesis de novo was specifically diminished.”
t0“barley”
Claim · model-written summary
The R isomer inhibited fatty acid synthesis.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- (R) isomere0
- Outcome
- fatty acid synthesise0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By using resolved stereoisomers, it was found that the (R) isomer was the form which inhibited fatty acid synthesis, a finding that is in agreement with its herbicidal activity.”
t0“barley”
Claim · model-written summary
The authors propose de novo fatty acid synthesis inhibition as the basis of selective fluazifop action.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- selective mode of action of fluazifope0
- Qualifier
- inhibition of fatty acid synthesis de novoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggest that inhibition of fatty acid synthesis de novo forms the basis for the selective mode of action of fluazifop.”
t0“barley”
The same questions in other papers
herbicide · growth · Hordeum vulgare (barley)Positive and negative results
13 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
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See all 22 papers →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.