Abstract
Abstract The short‐term effects of nitrate on symbiotic nitrogen fixation were studied in six cultivars of pea ( Pisum sativum L.) using two strains of Rhizobium leguminosarum. Plants grown symbiotically for three weeks, in order to eliminate the effect of NO 3 on nodule formation, were exposed to nil, 5 or 15 mM NO 3 for a period of seven days. Nodule mass, nitrogenase activity by acetylene reduction and the NO 2 and NO 3 concentrations in nodules were determined. Exposure to nitrate reduced the total acetylene reduction activity (ARA) in all cultivars, and a significant cultivar × nitrate treatment interaction was found. Nitrate influenced the components of N 2 fixation, nodule mass and specific ARA (ARA/mg nodule), differently within and among cultivars. Nodule mass was reduced in all cultivars, but a variation among cultivars in the degree of reduction was found. Nitrate also reduced the specific ARA to different extents in the cultivars‐ The specific ARA of nodules from NO 3 ‐treated plants, expressed as per cent of the specific ARA of nodules from plants grown without NOT 3 was negatively correlated with the concentration of NO 3 in nodules. No relationship was found between the reduction of N 2 fixation and the nitrite concentration in nodules. The results indicate that it is possible to improve the nitrate tolerance of symbiotic N 2 fixation of the established pea/ Rhizobium symbiosis by selection of suitable host plants.
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Claims 7
Claim · model-written summary
Nitrate reduced total acetylene reduction activity in all pea cultivars.
- Taxon
- Pisum sativum L.
Lathyrus oleraceuse1 - Treatment
- nitratee0
- Interactor
- Rhizobium leguminosarum
Rhizobium leguminosarume1symbiont - Outcome
- total acetylene reduction activity (ARA)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to nitrate reduced the total acetylene reduction activity (ARA) in all cultivars”
e1“six cultivars of pea ( Pisum sativum L.) using two strains of Rhizobium leguminosarum”
Claim · model-written summary
Cultivar and nitrate treatment interacted significantly for acetylene reduction activity.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Material
- cultivare0
- Treatment
- nitrate treatmente0
- Outcome
- cultivar × nitrate treatment interactione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant cultivar × nitrate treatment interaction was found”
e1“six cultivars of pea ( Pisum sativum L.)”
Claim · model-written summary
Nitrate reduced nodule mass in all cultivars, with varying reductions among cultivars.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse2
- Treatment
- Nitratee1
- Outcome
- Nodule masse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule mass was reduced in all cultivars, but a variation among cultivars in the degree of reduction was found.”
e1“Nitrate influenced the components of N 2 fixation, nodule mass”
e2“Pisum sativum L.”
Claim · model-written summary
Nitrate reduced specific acetylene reduction activity to different extents among cultivars.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Treatment
- Nitratee0
- Outcome
- specific ARAe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate also reduced the specific ARA to different extents in the cultivars”
e1“Pisum sativum L.”
Claim · model-written summary
Specific acetylene reduction activity was negatively correlated with nodule nitrate concentration.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Compound
- NO 3 in nodulese0
- Outcome
- specific ARA of nodulese0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The specific ARA of nodules from NO 3 ‐treated plants, expressed as per cent of the specific ARA of nodules from plants grown without NOT 3 was negatively correlated with the concentration of NO 3 in nodules.”
e1“Pisum sativum L.”
Claim · model-written summary
Reduction of nitrogen fixation was unrelated to nodule nitrite concentration.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Compound
- nitrite concentration in nodulese0
- Outcome
- reduction of N 2 fixatione0
- Direction
- No relationshipe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No relationship was found between the reduction of N 2 fixation and the nitrite concentration in nodules.”
e1“Pisum sativum L.”
Claim · model-written summary
Selecting suitable pea hosts may improve nitrate tolerance of established pea–Rhizobium symbioses.
- Taxon
- peaLathyrus oleraceuse0
- Outcome
- improve the nitrate tolerance of symbiotic N 2 fixatione0
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is possible to improve the nitrate tolerance of symbiotic N 2 fixation of the established pea/ Rhizobium symbiosis by selection of suitable host plants.”
The same questions in other papers
nitrogen · symbiosis · Lathyrus oleraceus (pea)Results differ
15 papers in the same direction as this paper · 9 in the opposite direction
- positive
- no effect
- positive
21 papers more in this group
See all 25 papers →nitrogen · Rhizobium leguminosarum · Lathyrus oleraceus (pea)Results agree
3 papers in the same direction as this paper
- negative
- no effect
- negative
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.