Abstract
Glyphosate is a herbicide that blocks the shikimic acid pathway. Three Bradyrhizobium japonicum strains with different sensitivities to glyphosate were used to test the effect of this herbicide on the phenolic metabolism of nodulated soybeans and on the bacteroid nitrogenase activity. Glyphosate caused an inhibition in the bacteroid nitrogenase activity that was related with the sensitivity of the nodule-forming strains. Both leaves and nodules accumulated huge amounts of shikimate and phenolic acids (mainly protocatechuic acid), indicating that the herbicide was translocated to the nodule and disturbed phenolic metabolism. However, this accumulation was not clearly related to the sensitivity of the different strains. Bacteroids from control plants were incubated with the same concentration of shikimate, and phenolic acid accumulated in glyphosate-treated plants. Despite the high levels found in nodules, they were not responsible for the decrease of the nitrogenase activity. Glyphosate by itself caused a small inhibition of the bacteroid nitrogenase activity.
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Claims 5
Claim · model-written summary
Glyphosate inhibited bacteroid nitrogenase activity, depending on strain sensitivity.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Glyphosatee0
- Interactor
- Bradyrhizobium japonicum
Bradyrhizobium japonicume1symbiont - Outcome
- bacteroid nitrogenase activitye0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean (Glycine max L. Merr.)”
e0“Glyphosate caused an inhibition in the bacteroid nitrogenase activity that was related with the sensitivity of the nodule-forming strains.”
e1“Three Bradyrhizobium japonicum strains with different sensitivities to glyphosate”
Claim · model-written summary
Glyphosate-treated leaves and nodules accumulated shikimate and phenolic acids.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- leaves and nodulese0
- Outcome
- shikimate and phenolic acidse0
- Direction
- accumulatede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean (Glycine max L. Merr.)”
e0“Both leaves and nodules accumulated huge amounts of shikimate and phenolic acids (mainly protocatechuic acid)”
Claim · model-written summary
Phenolic accumulation was not clearly related to strain sensitivity.
- Taxon
- SoybeanGlycine maxt0
- Material
- different strainse0
- Outcome
- this accumulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean (Glycine max L. Merr.)”
e0“However, this accumulation was not clearly related to the sensitivity of the different strains.”
Claim · model-written summary
Accumulated shikimate and phenolic acid were not responsible for decreased nitrogenase activity.
- Taxon
- SoybeanGlycine maxt0
- Compound
- shikimatee1
- Outcome
- nitrogenase activitye0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean (Glycine max L. Merr.)”
e0“Despite the high levels found in nodules, they were not responsible for the decrease of the nitrogenase activity.”
e1“Bacteroids from control plants were incubated with the same concentration of shikimate, and phenolic acid accumulated in glyphosate-treated plants.”
Claim · model-written summary
Glyphosate alone caused a small inhibition of bacteroid nitrogenase activity.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Glyphosatee0
- Outcome
- bacteroid nitrogenase activitye0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean (Glycine max L. Merr.)”
e0“Glyphosate by itself caused a small inhibition of the bacteroid nitrogenase activity.”
The same questions in other papers
glyphosate · Bradyrhizobium japonicum · Glycine max (soybean)Results agree
2 papers in the same direction as this paper
- negative
- no effect
glyphosate · physiology: enzyme activity · Glycine max (soybean)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.