Abstract
The diphenyl ether acifluorfen enhances the blue light-induced absorbance change in Triton X100-solubilized crude membrane preparations from etiolated oat (Avena sativa L. cv. Lodi) coleoptiles. Enhancement of the spectral change is correlated with a change in rate of dark reoxidation of a b-type cytochrome. Similar, although smaller, enhancement was obtained with oxyfluorfen, nitrofen, and bifenox. Light-minus-dark difference spectra in the presence and absence of acifluorfen, and the dithionite-reduced-minus oxidized difference spectrum indicate that acifluorfen is acting specifically at a blue light-sensitive cytochrome-flavin complex. Sodium azide, a flavin inhibitor, decreases the light-induced absorbance change significantly, but does not affect the dark reoxidation of the cytochrome. Hence, it is acting on the light reaction, suggesting that the photoreceptor itself is a flavin. Acifluorfen sensitizes phototropism in dark-grown oat seedlings such that the first positive response occurs with blue light fluences as little as one-third of those required to elicit the same response in seedlings grown in the absence of the herbicide. Both this increase in sensitivity to light and the enhancement of the light-induced cytochrome reduction vary with the applied acifluorfen concentration in a similar manner. The herbicide is without effect either on elongation or on the geotropic response of dark-grown oat seedlings, indicating that acifluorfen is acting specifically close to, or at the photoreceptor end of, the stimulus-response chain. It seems likely that the flavin-cytochrome complex serves to transduce the light signal into curvature in phototropism in oats, with the flavin moiety itself serving as the photoreceptor.
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Claims 13
Claim · model-written summary
Acifluorfen enhanced blue-light absorbance change in oat coleoptile membranes.
- Taxon
- oat
Avena sativae0 - Material
- Avena sativa L. cv. Lodie0
- Organ / stage
- coleoptilese0
- Treatment
- acifluorfene0
- Outcome
- blue light-induced absorbance changee0
- Direction
- enhancese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The diphenyl ether acifluorfen enhances the blue light-induced absorbance change in Triton X100-solubilized crude membrane preparations from etiolated oat (Avena sativa L. cv. Lodi) coleoptiles.”
Claim · model-written summary
Spectral enhancement correlated with the rate of cytochrome dark reoxidation.
- Taxon
- oatAvena sativat0
- Gene
- b-type cytochromee0
- Outcome
- Enhancement of the spectral changee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enhancement of the spectral change is correlated with a change in rate of dark reoxidation of a b-type cytochrome.”
t0“Oat Coleoptiles”
t1“Oat Coleoptiles”
Claim · model-written summary
Oxyfluorfen enhanced the spectral change to a smaller extent.
- Taxon
- oatAvena sativat0
- Treatment
- oxyfluorfene0
- Outcome
- enhancemente0
- Direction
- smallere0
- Comparator
- acifluorfene1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar, although smaller, enhancement was obtained with oxyfluorfen, nitrofen, and bifenox.”
e1“The diphenyl ether acifluorfen enhances the blue light-induced absorbance change in Triton X100-solubilized crude membrane preparations from etiolated oat (Avena sativa L. cv. Lodi) coleoptiles.”
t0“Oat Coleoptiles”
t1“Oat Coleoptiles”
Claim · model-written summary
Nitrofen enhanced the spectral change to a smaller extent.
- Taxon
- oatAvena sativat0
- Treatment
- nitrofene0
- Outcome
- enhancemente0
- Direction
- smallere0
- Comparator
- acifluorfene1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar, although smaller, enhancement was obtained with oxyfluorfen, nitrofen, and bifenox.”
e1“The diphenyl ether acifluorfen enhances the blue light-induced absorbance change in Triton X100-solubilized crude membrane preparations from etiolated oat (Avena sativa L. cv. Lodi) coleoptiles.”
t0“Oat Coleoptiles”
t1“Oat Coleoptiles”
Claim · model-written summary
Bifenox enhanced the spectral change to a smaller extent.
- Taxon
- oatAvena sativat0
- Treatment
- bifenoxe0
- Outcome
- enhancemente0
- Direction
- smallere0
- Comparator
- acifluorfene1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar, although smaller, enhancement was obtained with oxyfluorfen, nitrofen, and bifenox.”
e1“The diphenyl ether acifluorfen enhances the blue light-induced absorbance change in Triton X100-solubilized crude membrane preparations from etiolated oat (Avena sativa L. cv. Lodi) coleoptiles.”
t0“Oat Coleoptiles”
t1“Oat Coleoptiles”
Claim · model-written summary
Spectra indicated acifluorfen acts at a blue-light-sensitive cytochrome-flavin complex.
- Taxon
- oatAvena sativat0
- Treatment
- acifluorfene0
- Outcome
- blue light-sensitive cytochrome-flavin complexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicate that acifluorfen is acting specifically at a blue light-sensitive cytochrome-flavin complex.”
t0“Oat Coleoptiles”
t1“Oat Coleoptiles”
Claim · model-written summary
Sodium azide significantly decreased light-induced absorbance change.
- Taxon
- oatAvena sativat0
- Treatment
- Sodium azidee0
- Outcome
- light-induced absorbance changee0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sodium azide, a flavin inhibitor, decreases the light-induced absorbance change significantly”
t0“Oat Coleoptiles”
t1“Oat Coleoptiles”
Claim · model-written summary
Sodium azide did not affect dark cytochrome reoxidation.
- Taxon
- oatAvena sativat0
- Treatment
- Sodium azidee1
- Outcome
- dark reoxidation of the cytochromee0
- Direction
- does not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but does not affect the dark reoxidation of the cytochrome.”
e1“Sodium azide, a flavin inhibitor, decreases the light-induced absorbance change significantly”
t0“Oat Coleoptiles”
t1“Oat Coleoptiles”
Claim · model-written summary
Acifluorfen sensitized oat phototropism to one-third of the usual blue-light fluence.
- Taxon
- oatAvena sativae0
- Treatment
- Acifluorfene0
- Outcome
- phototropisme0
- Direction
- sensitizese0
- Value
- one-thirde0
- Comparator
- absence of the herbicidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acifluorfen sensitizes phototropism in dark-grown oat seedlings such that the first positive response occurs with blue light fluences as little as one-third of those required to elicit the same response in seedlings grown in the absence of the herbicide.”
Claim · model-written summary
Light sensitivity and cytochrome reduction varied similarly with acifluorfen concentration.
- Taxon
- oatAvena sativat0
- Treatment
- acifluorfen concentratione0
- Outcome
- increase in sensitivity to light and the enhancement of the light-induced cytochrome reductione0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both this increase in sensitivity to light and the enhancement of the light-induced cytochrome reduction vary with the applied acifluorfen concentration in a similar manner.”
t0“Oat Coleoptiles”
t1“Oat Coleoptiles”
Claim · model-written summary
Acifluorfen did not affect oat seedling elongation.
- Taxon
- oatAvena sativae0
- Treatment
- herbicidee0
- Outcome
- elongatione0
- Direction
- without effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The herbicide is without effect either on elongation or on the geotropic response of dark-grown oat seedlings”
Claim · model-written summary
Acifluorfen did not affect the geotropic response of oat seedlings.
- Taxon
- oatAvena sativae0
- Treatment
- herbicidee0
- Outcome
- geotropic responsee0
- Direction
- without effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The herbicide is without effect either on elongation or on the geotropic response of dark-grown oat seedlings”
Claim · model-written summary
The flavin-cytochrome complex likely transduces light into phototropic curvature.
- Taxon
- oatsAvena sativae0
- Outcome
- curvature in phototropisme0
- Qualifier
- flavin-cytochrome complexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It seems likely that the flavin-cytochrome complex serves to transduce the light signal into curvature in phototropism in oats, with the flavin moiety itself serving as the photoreceptor.”
The same questions in other papers
herbicide · growth · Avena sativa (oats)Positive and negative results
11 papers in the same direction as this paper · 5 in the opposite direction
- positive
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See all 17 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.