Abstract
Peroxidizing herbicides have a common mode of action, i. e. inhibition of chlorophyll biosynthesis. A molecular target of these herbicides is protoporphyrinogen-IX oxidase (Protox). Corn is widely used for Protox inhibitory assays by peroxidizing herbicides because the plant enzyme has high and stable activity. The Protox isolated from one corn variety, Anjou, has been used for the assay in our laboratory and several others. This variety can no longer be used however, because of its reduced tolerance against corn diseases. Therefore, we collected twelve corn varieties and compared their Protox activities and sensitivities against peroxidizing herbicides. Among the tested varieties, DK212MF exhibited the highest activity. This variety has approximately two times higher activity than Anjou. Tolerance of Anjou and DK212MF to peroxidizing herbicides was evaluated by a pot test, because the varieties have quite different Protox activities. DK212MF was less sensitive to the peroxidizing herbicides oxyfluorfen and chlorophthalim than Anjou. Furthermore, DK212MF accumulated less Proto-IX than Anjou, which was believed to be one of the causes of its lower sensitivity in vivo to the peroxidizing herbicides.
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Claims 5
Claim · model-written summary
DK212MF had the highest Protox activity among the tested corn varieties.
- Taxon
- Corn
Zea mays subsp. mayst0 - Material
- DK212MFe0
- Outcome
- activitye0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the tested varieties, DK212MF exhibited the highest activity.”
t0“Corn Varieties”
Claim · model-written summary
DK212MF Protox activity was approximately twice Anjou activity.
- Taxon
- CornZea mays subsp. mayst0
- Material
- DK212MFe1
- Outcome
- activitye0
- Direction
- highere0
- Value
- approximately two timese0
- Comparator
- Anjoue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This variety has approximately two times higher activity than Anjou.”
e1“DK212MF exhibited the highest activity.”
t0“Corn Varieties”
Claim · model-written summary
DK212MF was less sensitive to oxyfluorfen and chlorophthalim than Anjou.
- Taxon
- CornZea mays subsp. mayst0
- Material
- DK212MFe0
- Treatment
- oxyfluorfen and chlorophthalime0
- Outcome
- sensitivee0
- Direction
- less sensitivee0
- Comparator
- Anjoue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DK212MF was less sensitive to the peroxidizing herbicides oxyfluorfen and chlorophthalim than Anjou.”
t0“Corn Varieties”
Claim · model-written summary
DK212MF accumulated less Proto-IX than Anjou.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DK212MF accumulated less Proto-IX than Anjou”
t0“Corn Varieties”
Claim · model-written summary
The authors proposed lower Proto-IX accumulation as one cause of DK212MF lower in vivo herbicide sensitivity.
- Taxon
- CornZea mays subsp. mayst0
- Material
- DK212MFe0
- Outcome
- lower sensitivity in vivoe0
- Qualifier
- accumulated less Proto-IXe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DK212MF accumulated less Proto-IX than Anjou, which was believed to be one of the causes of its lower sensitivity in vivo to the peroxidizing herbicides.”
t0“Corn Varieties”