Abstract
A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules and the relation of relative efficiency to plant dry weight and N content. Only 14 of the isolates exhibited significant uptake hydrogenase activity and none of these had sufficient hydrogenase activity to recycle all of the H 2 produced by nitrogenase. In 74 of the isolates tested relative efficiencies of N 2 fixation were less than 0.60.Twenty-nine of the isolates were ineffective, since total plant N at harvest did not differ significantly from uninoculated controls. The remaining 79 effective isolates could be divided into low-and high-efficiency groups. Plants which were inoculated with isolates from the two groups and harvested after 4 weeks did not differ significantly in plant dry weight or N content. Among the isolates with high relative efficiency of N 2 fixation, two groups could be recognized: one possessing significant uptake hydrogenase activity, the other lacking hydrogenase activity but in which H 2 evolution was low. Although the two groups did not differ with respect to plant dry weight or N content, the identification of this latter group may be of some significance for optimizing the efficiency of N 2 fixation.
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Claims 8
Claim · model-written summary
Only 14 of 108 isolates of Rhizobium leguminosarum had significant uptake hydrogenase activity in pea nodules.
- Taxon
- Pisum sativum
Lathyrus oleraceuse0 - Interactor
- Rhizobium leguminosarum
Rhizobium leguminosarume0symbiont - Outcome
- uptake hydrogenase activitye1
- Value
- 14e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules”
e1“Only 14 of the isolates exhibited significant uptake hydrogenase activity”
Claim · model-written summary
None of the isolates with significant uptake hydrogenase activity had sufficient activity to recycle all the H2 produced by nitrogenase.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume0symbiont
- Outcome
- sufficient hydrogenase activitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules”
e2“none of these had sufficient hydrogenase activity to recycle all of the H 2 produced by nitrogenase”
Claim · model-written summary
In 74 of the isolates tested, relative efficiency of N2 fixation was less than 0.60.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume0symbiont
- Outcome
- relative efficiencies of N 2 fixatione3
- Direction
- less thane3
- Value
- 0.60e3
- Qualifier
- 74 of the isolates testede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules”
e3“In 74 of the isolates tested relative efficiencies of N 2 fixation were less than 0.60”
Claim · model-written summary
Twenty-nine isolates were ineffective, as total plant N at harvest did not differ significantly from uninoculated controls.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- isolatese4
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume0symbiont
- Outcome
- total plant N at harveste4
- Direction
- did not differ significantlye4
- Comparator
- uninoculated controlse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules”
e4“Twenty-nine of the isolates were ineffective, since total plant N at harvest did not differ significantly from uninoculated controls”
Claim · model-written summary
The remaining 79 effective isolates could be divided into low- and high-efficiency groups.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume0symbiont
- Outcome
- divided into low-and high-efficiency groupse5
- Value
- 79e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules”
e5“The remaining 79 effective isolates could be divided into low-and high-efficiency groups”
Claim · model-written summary
Plants inoculated with isolates from the two efficiency groups did not differ significantly in dry weight or N content after 4 weeks.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- inoculated with isolates from the two groupse6
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume0symbiont
- Outcome
- plant dry weight or N contente6
- Direction
- did not differ significantlye6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules”
e6“Plants which were inoculated with isolates from the two groups and harvested after 4 weeks did not differ significantly in plant dry weight or N content”
Claim · model-written summary
Isolates lacking hydrogenase activity but with high relative efficiency had low H2 evolution.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume0symbiont
- Outcome
- H 2 evolutione7
- Direction
- lowe7
- Qualifier
- lacking hydrogenase activitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules”
e7“lacking hydrogenase activity but in which H 2 evolution was low”
Claim · model-written summary
The two isolate groups with high relative efficiency did not differ in plant dry weight or N content.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- the two groupse7
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume0symbiont
- Outcome
- plant dry weight or N contente7
- Direction
- did not differe7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H 2 uptake and relative efficiency of N 2 fixation in Pisum sativum L. root nodules”
e7“Although the two groups did not differ with respect to plant dry weight or N content”
The same questions in other papers
inoculation · Rhizobium leguminosarum · Lathyrus oleraceus (pea)Results differ
5 papers in the same direction as this paper · 11 in the opposite direction
- no effect
- positive
- positive
13 papers more in this group
See all 17 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.