Abstract
The effects of inoculation of red clover with Rhizobium leguminosarum bv. trifolii strains 285 and 7612 were studied. In greenhouse experiments repeated inoculations were made. Strain 285 occupied all nodules when included, and strain 7612 increased its nodule occupancy with repeated inoculation. In field studies, where native, ineffective red clover bacteria were present, increased levels of inoculum were added, which increased dry matter production and nitrogen content of the plants. Yields from plants inoculated with strain 7612 were higher but dependent on inoculum concentration. The number of early nodules occupied by inoculant bacteria increased with increasing inoculum concentrations of strain 7612 but not of strain 285. The inoculant strain occupancy of late nodules was unaffected by inoculum levels in both cases. Acetylene reduction and accumulation of 14 C-labelled metabolites in nodules situated at different distances from the shoots and in nodules of different ages, including overwintering nodules, were studied. Nodule placement did not influence the biological activity of the nodules. Old nodules were less active on a dry matter basis, but since they are larger, they may have contributed to the nitrogen balance of the plants as much as young nodules. Overwintering the plants did not change this pattern. Key words: competition, inoculation, nodule life cycle, Rhizobium.
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Claims 12
Claim · model-written summary
Strain 285 occupied all nodules when included.
- Taxon
- red clover
Trifolium pratenset0 - Interactor
- Strain 285e0symbiont
- Outcome
- occupied all nodulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strain 285 occupied all nodules when included”
t0“red clover”
Claim · model-written summary
Repeated inoculation increased strain 7612 nodule occupancy.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- repeated inoculatione0
- Interactor
- strain 7612e0symbiont
- Outcome
- nodule occupancye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strain 7612 increased its nodule occupancy with repeated inoculation”
t0“red clover”
Claim · model-written summary
Higher inoculum increased plant dry matter production.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- increased levels of inoculume0
- Outcome
- dry matter productione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased levels of inoculum were added, which increased dry matter production and nitrogen content of the plants”
t0“red clover”
Claim · model-written summary
Higher inoculum increased plant nitrogen content.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- increased levels of inoculume0
- Outcome
- nitrogen content of the plantse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased levels of inoculum were added, which increased dry matter production and nitrogen content of the plants”
t0“red clover”
Claim · model-written summary
Yields with strain 7612 were higher but depended on inoculum concentration.
- Taxon
- red cloverTrifolium pratenset0
- Interactor
- strain 7612e0symbiont
- Outcome
- Yieldse0
- Direction
- highere0
- Qualifier
- dependent on inoculum concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields from plants inoculated with strain 7612 were higher but dependent on inoculum concentration”
t0“red clover”
Claim · model-written summary
More strain 7612 inoculum increased early nodule occupancy.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- increasing inoculum concentrations of strain 7612e0
- Interactor
- strain 7612e0symbiont
- Outcome
- number of early nodules occupied by inoculant bacteriae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of early nodules occupied by inoculant bacteria increased with increasing inoculum concentrations of strain 7612”
t0“red clover”
Claim · model-written summary
More strain 285 inoculum did not increase early nodule occupancy.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- increasing inoculum concentrationse0
- Interactor
- strain 285e0symbiont
- Outcome
- number of early nodules occupied by inoculant bacteriae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of early nodules occupied by inoculant bacteria increased with increasing inoculum concentrations of strain 7612 but not of strain 285”
t0“red clover”
Claim · model-written summary
Inoculum level did not affect late nodule occupancy for either strain.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- inoculum levelse0
- Outcome
- inoculant strain occupancy of late nodulese0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inoculant strain occupancy of late nodules was unaffected by inoculum levels in both cases”
t0“red clover”
Claim · model-written summary
Nodule placement did not influence biological activity.
- Taxon
- red cloverTrifolium pratenset0
- Organ / stage
- Nodulee0
- Outcome
- biological activity of the nodulese0
- Direction
- did not influencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule placement did not influence the biological activity of the nodules”
t0“red clover”
Claim · model-written summary
Old nodules had lower activity per dry matter than young nodules.
- Taxon
- red cloverTrifolium pratenset0
- Organ / stage
- Old nodulese0
- Outcome
- active on a dry matter basise0
- Direction
- lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Old nodules were less active on a dry matter basis”
t0“red clover”
Claim · model-written summary
Larger old nodules may have contributed as much to nitrogen balance as young nodules.
- Taxon
- red cloverTrifolium pratenset0
- Organ / stage
- young nodulese0
- Outcome
- nitrogen balance of the plantse0
- Direction
- as much ase0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“since they are larger, they may have contributed to the nitrogen balance of the plants as much as young nodules”
t0“red clover”
Claim · model-written summary
Overwintering did not change the age-related nodule activity pattern.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- this patterne0
- Direction
- did not changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overwintering the plants did not change this pattern”
t0“red clover”
The same questions in other papers
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- no effect
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See all 5 papers →inoculation · symbiosis · Trifolium pratense (red clover)Positive and negative results
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- negative
- positive
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4 papers more in this group
See all 8 papers →inoculation · yield · Trifolium pratense (red clover)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.