Abstract
Abstract Nodules of Rhizobium leguminosarum bv. phaseoli in symbiosis with Phaseolus vulgaris were compared with regard to their nitrogenase activity and activities of enzymes involved in the removal of O2 ·- and H 2 O 2 as well as total ascorbate content. Activities of catalase (EC 1.11.1.6), ascorbate peroxidase (EC 1.11.1.11), and total ascorbate content were consistently higher in nodules inhabited by bacterial strains with higher nitrogenase activity. Values for superoxide dismutase (EC 1.15.11), and guaiacol peroxidase activity did not differ for the bacterial strains compared. On the other hand, when different plant cultivars were inoculated with the same bacterial strain, high nitrogenase activity did not correlate with a higher activity of the oxygen scavenging enzyms or a higher content of total ascorbate. In this case, values for guaiacol peroxidase activity were greatly enhanced in nodules with lower nitrogen ase activity. This may be part of a hypersensitive reaction of the plant cultivar against the bacterial symbiotic partner. Inhibition of catalase activity in the nodules by addition of triazole to the nutrient solution did not alter nitrogenase activity within the first nine hours after addition. It can be concluded that the activity of catalase, ascorbate peroxidase, and superoxide dismutase is not generally coupled to nitrogenase activity in root nodules of P. vulgaris.
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Claims 8
Claim · model-written summary
Catalase and ascorbate peroxidase activities were higher in nodules with bacterial strains having higher nitrogenase activity.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarist0 - Organ / stage
- Root Nodulest0
- Interactor
- bacterial strainse0symbiont
- Gene
- catalase (EC 1.11.1.6), ascorbate peroxidase (EC 1.11.1.11)e0
- Outcome
- Activities of catalase (EC 1.11.1.6), ascorbate peroxidase (EC 1.11.1.11)e0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activities of catalase (EC 1.11.1.6), ascorbate peroxidase (EC 1.11.1.11), and total ascorbate content were consistently higher in nodules inhabited by bacterial strains with higher nitrogenase activity”
t0“Root Nodules of Phaseolus vulgaris L.”
Claim · model-written summary
Total ascorbate content was higher in nodules with bacterial strains having higher nitrogenase activity.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- Root Nodulest0
- Outcome
- total ascorbate contente0
- Direction
- highere0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activities of catalase (EC 1.11.1.6), ascorbate peroxidase (EC 1.11.1.11), and total ascorbate content were consistently higher in nodules inhabited by bacterial strains with higher nitrogenase activity”
t0“Root Nodules of Phaseolus vulgaris L.”
Claim · model-written summary
Superoxide dismutase and guaiacol peroxidase activities did not differ among bacterial strains.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Gene
- superoxide dismutase (EC 1.15.11), and guaiacol peroxidasee0
- Outcome
- Values for superoxide dismutase (EC 1.15.11), and guaiacol peroxidase activitye0
- Direction
- did not differe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Values for superoxide dismutase (EC 1.15.11), and guaiacol peroxidase activity did not differ for the bacterial strains compared”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Across plant cultivars inoculated with one strain, nitrogenase activity did not correlate with oxygen scavenging enzyme activity.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Material
- different plant cultivarse0
- Treatment
- inoculated with the same bacterial straine0
- Interactor
- bacterial straine0symbiont
- Outcome
- activity of the oxygen scavenging enzymse0
- Direction
- did not correlatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when different plant cultivars were inoculated with the same bacterial strain, high nitrogenase activity did not correlate with a higher activity of the oxygen scavenging enzyms”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Across plant cultivars inoculated with one strain, high nitrogenase activity did not correlate with higher ascorbate content.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- Root Nodulest0
- Outcome
- content of total ascorbatee0
- Direction
- did not correlatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high nitrogenase activity did not correlate with a higher activity of the oxygen scavenging enzyms or a higher content of total ascorbate”
t0“Root Nodules of Phaseolus vulgaris L.”
Claim · model-written summary
Guaiacol peroxidase activity was enhanced in nodules with lower nitrogenase activity.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- nodulese0
- Gene
- guaiacol peroxidasee0
- Outcome
- guaiacol peroxidase activitye0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“values for guaiacol peroxidase activity were greatly enhanced in nodules with lower nitrogen ase activity”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Triazole inhibition of nodule catalase did not alter nitrogenase activity in the first nine hours.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- nodulese0
- Treatment
- addition of triazole to the nutrient solutione0
- Gene
- catalasee0
- Outcome
- nitrogenase activitye0
- Direction
- did not altere0
- Qualifier
- within the first nine hours after additione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibition of catalase activity in the nodules by addition of triazole to the nutrient solution did not alter nitrogenase activity within the first nine hours after addition”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
The authors concluded that catalase, ascorbate peroxidase and superoxide dismutase activities are not generally coupled to nitrogenase activity.
- Taxon
- P. vulgarisPhaseolus vulgarise0
- Organ / stage
- root nodulese0
- Gene
- catalase, ascorbate peroxidase, and superoxide dismutasee0
- Outcome
- nitrogenase activitye0
- Direction
- not generally couplede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activity of catalase, ascorbate peroxidase, and superoxide dismutase is not generally coupled to nitrogenase activity in root nodules of P. vulgaris”
The same questions in other papers
fertilization · physiology: enzyme activity · Phaseolus vulgaris (common bean)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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.