Abstract
Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea) and different concentrations of urea. The distribution of growth between plant parts varied with N-sources. Nitrate and ammonium were more inhibitory to nodulation than urea, which at 40 mol m−3 N had no effect. Urease activity varied in amount and location over a range of urea concentrations. At higher concentrations, more urea was transported to and increased urease activity was found in the shoot Lower levels of activity in plants reliant on N2-fixation were consistent with a ureide-degradation pathway not involving urea. Moderate doses of urea could be assimilated concomitantly with N2-fixation. At higher levels of applied urea, nodulation and ureide transport to the shoots were reduced, although increased growth could not be maintained at concentrations of applied urea greater than 6.0 mol m−3 urea N.
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Claims 9
Claim · model-written summary
The distribution of growth between plant parts varied with the N-source.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise0 - Treatment
- N-sourcese1
- Outcome
- distribution of growth between plant partse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e1“The distribution of growth between plant parts varied with N-sources”
Claim · model-written summary
Nitrate and ammonium were more inhibitory to nodulation than urea.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- Nitrate and ammoniume2
- Outcome
- nodulatione2
- Direction
- more inhibitorye2
- Comparator
- ureae2
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e2“Nitrate and ammonium were more inhibitory to nodulation than urea”
Claim · model-written summary
Urea at 40 mol m−3 N had no effect on nodulation.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- ureae2
- Outcome
- nodulatione2
- Direction
- no effecte3
- Qualifier
- 40 mol m−3 Ne3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e2“Nitrate and ammonium were more inhibitory to nodulation than urea”
e3“which at 40 mol m−3 N had no effect”
Claim · model-written summary
Urease activity varied in amount and location over a range of urea concentrations.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- urea concentrationse4
- Outcome
- urease activitye4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e4“Urease activity varied in amount and location over a range of urea concentrations”
Claim · model-written summary
At higher urea concentrations, more urea was transported to the shoot and urease activity increased in the shoot.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Organ / stage
- shoote5
- Treatment
- At higher concentrationse5
- Outcome
- urease activitye5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e5“At higher concentrations, more urea was transported to and increased urease activity was found in the shoot”
Claim · model-written summary
Lower urease activity in N2-fixing plants is consistent with a ureide-degradation pathway that does not involve urea.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Outcome
- Lower levels of activitye6
- Qualifier
- ureide-degradation pathway not involving ureae6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e6“Lower levels of activity in plants reliant on N2-fixation were consistent with a ureide-degradation pathway not involving urea”
Claim · model-written summary
Moderate doses of urea could be assimilated concomitantly with N2-fixation.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- Moderate doses of ureae7
- Outcome
- assimilated concomitantly with N2-fixatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e7“Moderate doses of urea could be assimilated concomitantly with N2-fixation”
Claim · model-written summary
Higher levels of applied urea reduced nodulation and ureide transport to the shoots.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Organ / stage
- shootse1
- Treatment
- higher levels of applied ureae1
- Outcome
- nodulation and ureide transport to the shootse1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e1“At higher levels of applied urea, nodulation and ureide transport to the shoots were reduced”
Claim · model-written summary
Increased growth was not maintained at applied urea concentrations greater than 6.0 mol m−3 urea N.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- concentrations of applied urea greater than 6.0 mol m−3 urea Ne1
- Outcome
- growthe1
- Qualifier
- increased growth could not be maintainede1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobium-inoculatcd plants of Phaseolus vulgaris L. were grown with different N-sources (nitrate, ammonium, urea)”
e1“increased growth could not be maintained at concentrations of applied urea greater than 6.0 mol m−3 urea N”
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